DOI: https://doi.org/10.37349/ebmx.2023.00001
Aim:
The pleiotropic effect of fibroblast growth factor 2 (FGF2) on promoting myogenesis, angiogenesis, and innervation makes it an ideal growth factor for treating volumetric muscle loss (VML) injuries. While an initial delivery of FGF2 has demonstrated enhanced regenerative potential, the sustained delivery of FGF2 from scaffolds with robust structural properties as well as biophysical and biochemical signaling cues has yet to be explored for treating VML. The goal of this study is to develop an instructive fibrin microthread scaffold with intrinsic topographic alignment cues as well as regenerative signaling cues and a physiologically relevant, sustained release of FGF2 to direct myogenesis and ultimately enhance functional muscle regeneration.
Methods:
Heparin was passively adsorbed or carbodiimide-conjugated to microthreads, creating a biomimetic binding strategy, mimicking FGF2 sequestration in the extracellular matrix (ECM). It was also evaluated whether FGF2 incorporated into fibrin microthreads would yield sustained release. It was hypothesized that heparin-conjugated and co-incorporated (co-inc) fibrin microthreads would facilitate sustained release of FGF2 from the scaffold and enhance in vitro myoblast proliferation and outgrowth.
Results:
Toluidine blue staining and Fourier transform infrared spectroscopy confirmed that carbodiimide-conjugated heparin bound to fibrin microthreads in a dose-dependent manner. Release kinetics revealed that heparin-conjugated fibrin microthreads exhibited sustained release of FGF2 over a period of one week. An in vitro assay demonstrated that FGF2 released from microthreads remained bioactive, stimulating myoblast proliferation over four days. Finally, a cellular outgrowth assay suggests that FGF2 promotes increased outgrowth onto microthreads.
Conclusions:
It was anticipated that the combined effects of fibrin microthread structural properties, topographic alignment cues, and FGF2 release profiles will facilitate the fabrication of a biomimetic scaffold that enhances the regeneration of functional muscle tissue for the treatment of VML injuries.
Aim:
The pleiotropic effect of fibroblast growth factor 2 (FGF2) on promoting myogenesis, angiogenesis, and innervation makes it an ideal growth factor for treating volumetric muscle loss (VML) injuries. While an initial delivery of FGF2 has demonstrated enhanced regenerative potential, the sustained delivery of FGF2 from scaffolds with robust structural properties as well as biophysical and biochemical signaling cues has yet to be explored for treating VML. The goal of this study is to develop an instructive fibrin microthread scaffold with intrinsic topographic alignment cues as well as regenerative signaling cues and a physiologically relevant, sustained release of FGF2 to direct myogenesis and ultimately enhance functional muscle regeneration.
Methods:
Heparin was passively adsorbed or carbodiimide-conjugated to microthreads, creating a biomimetic binding strategy, mimicking FGF2 sequestration in the extracellular matrix (ECM). It was also evaluated whether FGF2 incorporated into fibrin microthreads would yield sustained release. It was hypothesized that heparin-conjugated and co-incorporated (co-inc) fibrin microthreads would facilitate sustained release of FGF2 from the scaffold and enhance in vitro myoblast proliferation and outgrowth.
Results:
Toluidine blue staining and Fourier transform infrared spectroscopy confirmed that carbodiimide-conjugated heparin bound to fibrin microthreads in a dose-dependent manner. Release kinetics revealed that heparin-conjugated fibrin microthreads exhibited sustained release of FGF2 over a period of one week. An in vitro assay demonstrated that FGF2 released from microthreads remained bioactive, stimulating myoblast proliferation over four days. Finally, a cellular outgrowth assay suggests that FGF2 promotes increased outgrowth onto microthreads.
Conclusions:
It was anticipated that the combined effects of fibrin microthread structural properties, topographic alignment cues, and FGF2 release profiles will facilitate the fabrication of a biomimetic scaffold that enhances the regeneration of functional muscle tissue for the treatment of VML injuries.
DOI: https://doi.org/10.37349/ebmx.2024.00006
Aim:
Since decades, decellularized extracellular matrix (dECM)-derived materials have received worldwide attention as promising biomaterials for tissue engineering and biomedical applications. Soluble dECM is a versatile raw material that can be easily engineered into the desired shapes and structures. However, there are still some limitations restricting its use, including low hydrophilicity and smooth surfaces, which negatively influence cell adhesion/spreading. The objective of the present study was to investigate surface modification by nitrogen/hydrogen (N2/H2) low-pressure cold plasma treatment as a potential technique to improve the biological response of bovine pericardium dECM films.
Methods:
Bovine pericardium dECM was enzymatically digested and lyophilized prior to the preparation of thin films via solvent-casting method. Changes in surface properties after plasma treatment were investigated using water contact angle (WCA) and X-ray photoelectron spectroscopy (XPS) measurements. Immunofluorescence staining and resazurin assay for human dermal fibroblasts (HDFs) cultured on the dECM films were used to assess the bioactivity of dECM films. Finally, the hemocompatibility of the films was investigated via clotting time and hemolysis assay.
Results:
WCA and XPS results revealed that oxygen (O)- and N-containing functional groups were incorporated onto the film surface and an increase in hydrophilicity was observed after plasma treatment. In vitro experiments showed that cell adhesion in plasma-treated dECM films is much faster if compared to the untreated controls. Moreover, the fibroblast proliferation increased after plasma surface modifications. Finally, the hemocompatibility analysis results indicated a delayed blood clotting and no hemolytic effects for all the tested samples.
Conclusions:
These findings confirmed the potential of dECM as raw material for biocompatible thin films fabrication. Additionally, plasma surface treatment emerged as an eco-friendly and cost-effective strategy to enhance in vitro cell attachment and proliferation on dECM films, expanding their applications in biomedicine.
Aim:
Since decades, decellularized extracellular matrix (dECM)-derived materials have received worldwide attention as promising biomaterials for tissue engineering and biomedical applications. Soluble dECM is a versatile raw material that can be easily engineered into the desired shapes and structures. However, there are still some limitations restricting its use, including low hydrophilicity and smooth surfaces, which negatively influence cell adhesion/spreading. The objective of the present study was to investigate surface modification by nitrogen/hydrogen (N2/H2) low-pressure cold plasma treatment as a potential technique to improve the biological response of bovine pericardium dECM films.
Methods:
Bovine pericardium dECM was enzymatically digested and lyophilized prior to the preparation of thin films via solvent-casting method. Changes in surface properties after plasma treatment were investigated using water contact angle (WCA) and X-ray photoelectron spectroscopy (XPS) measurements. Immunofluorescence staining and resazurin assay for human dermal fibroblasts (HDFs) cultured on the dECM films were used to assess the bioactivity of dECM films. Finally, the hemocompatibility of the films was investigated via clotting time and hemolysis assay.
Results:
WCA and XPS results revealed that oxygen (O)- and N-containing functional groups were incorporated onto the film surface and an increase in hydrophilicity was observed after plasma treatment. In vitro experiments showed that cell adhesion in plasma-treated dECM films is much faster if compared to the untreated controls. Moreover, the fibroblast proliferation increased after plasma surface modifications. Finally, the hemocompatibility analysis results indicated a delayed blood clotting and no hemolytic effects for all the tested samples.
Conclusions:
These findings confirmed the potential of dECM as raw material for biocompatible thin films fabrication. Additionally, plasma surface treatment emerged as an eco-friendly and cost-effective strategy to enhance in vitro cell attachment and proliferation on dECM films, expanding their applications in biomedicine.
DOI: https://doi.org/10.37349/ebmx.2024.00007
Neurodegenerative diseases (NDDs) gradually affect neurons impacting both their function and structure, and they afflict millions worldwide. Detecting these conditions before symptoms arise is crucial for better prognosis and duality of life, given that the disease processes often begin years earlier. Yet, reliable and affordable methods to diagnose NDDs in these stages are currently lacking. There’s a growing interest in using circulating extracellular vesicles (EVs), like small EVs (sEVs) also known as exosomes, as potential sources of markers for screening, diagnosing, and monitoring NDDs. This interest stems from evidence showing that these EVs can carry brain pathological proteins implicated in NDD pathology, and they can even traverse the blood-brain barrier. This review focuses on the creation of EVs, particularly sEVs with a size of less than 200 nanometers, methods for isolating sEVs, and recent advancements in biosensor development to detect NDD-related markers found in sEVs. Furthermore, it explores the potential of sEVs in diagnosing four major NDDs: Alzheimer’s disease (AD), Parkinson’s disease (PD), Huntington’s disease (HD), and multiple system atrophy (MSA).
Neurodegenerative diseases (NDDs) gradually affect neurons impacting both their function and structure, and they afflict millions worldwide. Detecting these conditions before symptoms arise is crucial for better prognosis and duality of life, given that the disease processes often begin years earlier. Yet, reliable and affordable methods to diagnose NDDs in these stages are currently lacking. There’s a growing interest in using circulating extracellular vesicles (EVs), like small EVs (sEVs) also known as exosomes, as potential sources of markers for screening, diagnosing, and monitoring NDDs. This interest stems from evidence showing that these EVs can carry brain pathological proteins implicated in NDD pathology, and they can even traverse the blood-brain barrier. This review focuses on the creation of EVs, particularly sEVs with a size of less than 200 nanometers, methods for isolating sEVs, and recent advancements in biosensor development to detect NDD-related markers found in sEVs. Furthermore, it explores the potential of sEVs in diagnosing four major NDDs: Alzheimer’s disease (AD), Parkinson’s disease (PD), Huntington’s disease (HD), and multiple system atrophy (MSA).
DOI: https://doi.org/10.37349/ebmx.2024.00008
Nanomedicine, a convergence of nanotechnology and medical sciences, has unleashed transformative potential in healthcare. However, harnessing the benefits of nanomedicine requires a thorough understanding of its regulatory landscape. An in-depth discussion of regulatory considerations, including molecular safety assessment, harmonization of the regulatory landscape, and shaping the future of innovation, is presented in this discourse. The molecular safety assessment entails evaluating interactions between nanoparticles and biomolecules, ensuring compatibility at the molecular level. Harmonization involves developing international standards and guidelines for a consistent regulatory approach, while shaping innovations emphasizes integrating molecular safety assessments into early stages of development. Challenges encompass the need for standardized assessment methods, balancing innovation with safety, and addressing unique features of novel molecular designs. As the nanomedicine landscape evolves, effective regulatory strategies must navigate the intricate interplay of molecules and technologies, ensuring both patient access and product safety.
Nanomedicine, a convergence of nanotechnology and medical sciences, has unleashed transformative potential in healthcare. However, harnessing the benefits of nanomedicine requires a thorough understanding of its regulatory landscape. An in-depth discussion of regulatory considerations, including molecular safety assessment, harmonization of the regulatory landscape, and shaping the future of innovation, is presented in this discourse. The molecular safety assessment entails evaluating interactions between nanoparticles and biomolecules, ensuring compatibility at the molecular level. Harmonization involves developing international standards and guidelines for a consistent regulatory approach, while shaping innovations emphasizes integrating molecular safety assessments into early stages of development. Challenges encompass the need for standardized assessment methods, balancing innovation with safety, and addressing unique features of novel molecular designs. As the nanomedicine landscape evolves, effective regulatory strategies must navigate the intricate interplay of molecules and technologies, ensuring both patient access and product safety.
DOI: https://doi.org/10.37349/ebmx.2024.00009
Aim:
Polymethylmethacrylate bone cement is often used to reconstruct critical-sized defects generated by the surgical resection of spinal metastases. Residual tumor cells after a resection can drive recurrence and destabilization. Doxorubicin (DOX) is a common chemotherapeutic drug with unwanted side-effects when administered systemically. Mesoporous silica nanoparticles (NPs) are gaining attention for targeted drug delivery to bypass the negative side effects associated with systemic drug administration. An NP-functionalized cement was developed for the local release of DOX and its ability to suppress cancer cells was tested.
Methods:
DOX was loaded onto NPs which were then mixed into the cement. Static contact angles were measured. Drug release profiles were obtained over a period of 4 weeks. Cement constructs were incubated with two-dimensional (2D) cultures of human bone-marrow derived mesenchymal stem cells and human osteoblasts, as well as 2D and three-dimensional (3D) cultures of breast and prostate cancer cell lines. Cell metabolic activity and viability were evaluated. Cell migration and spheroid growth of cancer cell lines were assessed in collagen-coated spheroid cultures.
Results:
NPs were homogenously dispersed and did not alter the mechanical strength nor the wettability of the cement. A sustained DOX release profile was achieved with the addition of NPs to the bone cement. The release profile of DOX from NP cement may be modified by varying the amount of the drug loaded onto the NPs and the proportion of NPs in the cement. Cancer cells treated with the cement constructs showed a dose- and time-dependent inhibition, with minimal toxicity against healthy cells. Cancer cell migration and spheroid growth were impaired in 3D culture.
Conclusions:
NPs were shown to be essential for sustained DOX release from bone cement. DOX-loaded NP cement can inhibit cancer cells and impair their migration, with strong potential for in vivo translation studies.
Aim:
Polymethylmethacrylate bone cement is often used to reconstruct critical-sized defects generated by the surgical resection of spinal metastases. Residual tumor cells after a resection can drive recurrence and destabilization. Doxorubicin (DOX) is a common chemotherapeutic drug with unwanted side-effects when administered systemically. Mesoporous silica nanoparticles (NPs) are gaining attention for targeted drug delivery to bypass the negative side effects associated with systemic drug administration. An NP-functionalized cement was developed for the local release of DOX and its ability to suppress cancer cells was tested.
Methods:
DOX was loaded onto NPs which were then mixed into the cement. Static contact angles were measured. Drug release profiles were obtained over a period of 4 weeks. Cement constructs were incubated with two-dimensional (2D) cultures of human bone-marrow derived mesenchymal stem cells and human osteoblasts, as well as 2D and three-dimensional (3D) cultures of breast and prostate cancer cell lines. Cell metabolic activity and viability were evaluated. Cell migration and spheroid growth of cancer cell lines were assessed in collagen-coated spheroid cultures.
Results:
NPs were homogenously dispersed and did not alter the mechanical strength nor the wettability of the cement. A sustained DOX release profile was achieved with the addition of NPs to the bone cement. The release profile of DOX from NP cement may be modified by varying the amount of the drug loaded onto the NPs and the proportion of NPs in the cement. Cancer cells treated with the cement constructs showed a dose- and time-dependent inhibition, with minimal toxicity against healthy cells. Cancer cell migration and spheroid growth were impaired in 3D culture.
Conclusions:
NPs were shown to be essential for sustained DOX release from bone cement. DOX-loaded NP cement can inhibit cancer cells and impair their migration, with strong potential for in vivo translation studies.
DOI: https://doi.org/10.37349/ebmx.2024.00010
The use of autologous cartilage and bone grafts remains the gold standard in augmentation rhinoplasty performed to reconstruct of the nasal dorsum. Meanwhile, limited number of available sources, donor site morbidity, and unpredictable graft resorption represent significant disadvantages of autografting. The aim of this study is to test combination of autologous stromal vascular fraction (SVF) and commercially available bone substitutes (BSs) as new tissue-engineered grafting material (GM) for rhinoplasty. A series of consecutive cases includes four adult patients who underwent rhinoplasty to correct saddle nose deformity (SND) using the new graft technique. SVF was isolated from liposuction aspirate using standard methodology of enzymatic digestion. Two types of BSs were combined with SVF: Bio-Oss granules to create a moldable graft (M-graft), and block-shaped BoneMedik-S to create rigid grafts (R-grafts). The moderate SND was treated using an M-graft. In case of major or complex SND, the nasal dorsum was reconstructed with dorso-columellar L-shaped framework made of R-grafts. The results were evaluated over a period of 6 months to 3 years postoperatively using photogrammetry and FACE-Q appearance appraisal scales. Computerised tomography (CT) scanning of the reconstructed nose and histological analysis of grafted material were also carried out. No complications were observed. The photograms show the restoration of the correct contour of the nose. FACE-Q appraisal scale scores increased significantly, including satisfaction with nose appearance, psychological well-being, and social function. In CT evaluation, there was no substantial resorption or warping of the grafts. Histological findings show osteogenic remodeling of the grafted material. Thus, combining autologous SVF with BSs is a promising strategy for developing rhinoplasty GM.
The use of autologous cartilage and bone grafts remains the gold standard in augmentation rhinoplasty performed to reconstruct of the nasal dorsum. Meanwhile, limited number of available sources, donor site morbidity, and unpredictable graft resorption represent significant disadvantages of autografting. The aim of this study is to test combination of autologous stromal vascular fraction (SVF) and commercially available bone substitutes (BSs) as new tissue-engineered grafting material (GM) for rhinoplasty. A series of consecutive cases includes four adult patients who underwent rhinoplasty to correct saddle nose deformity (SND) using the new graft technique. SVF was isolated from liposuction aspirate using standard methodology of enzymatic digestion. Two types of BSs were combined with SVF: Bio-Oss granules to create a moldable graft (M-graft), and block-shaped BoneMedik-S to create rigid grafts (R-grafts). The moderate SND was treated using an M-graft. In case of major or complex SND, the nasal dorsum was reconstructed with dorso-columellar L-shaped framework made of R-grafts. The results were evaluated over a period of 6 months to 3 years postoperatively using photogrammetry and FACE-Q appearance appraisal scales. Computerised tomography (CT) scanning of the reconstructed nose and histological analysis of grafted material were also carried out. No complications were observed. The photograms show the restoration of the correct contour of the nose. FACE-Q appraisal scale scores increased significantly, including satisfaction with nose appearance, psychological well-being, and social function. In CT evaluation, there was no substantial resorption or warping of the grafts. Histological findings show osteogenic remodeling of the grafted material. Thus, combining autologous SVF with BSs is a promising strategy for developing rhinoplasty GM.
DOI: https://doi.org/10.37349/ebmx.2024.00011
This article belongs to the special issue Bioinspired Material for Regenerative Medicine
DOI: https://doi.org/10.37349/ebmx.2024.00012
This article belongs to the special issue Innovations in Biomaterials for Dentistry and Oral Surgery
Aim:
This study aims to discover an alternative precursor with abundant source and low cost for multicolor graphene quantum dots (GQDs) preparation and application.
Methods:
In the current study, anthracite-derived multicolor GQDs were prepared at different reaction temperatures (100°–150°C), referring to the GQDs 100, GQDs 120, GQDs 130, and GQDs 150.
Results:
The GQDs 100, GQDs 120, GQDs 130, and GQDs 150 solutions were found to be orange-red, yellow-green, green, and blue under 365 nm excitation UV (ultraviolet) lamp, respectively. The X-ray photoelectron spectroscopy (XPS) data suggests high temperature intensifies oxidation of the amorphous sp3 carbon, resulting in GQDs with higher crystalline structure (Csp2). Compared with the GQDs 100 and GQDs 120, the GQDs 130 and GQDs 150 showed much better biocompatibility, which may attribute to their higher Csp2 composition and smaller size.
Conclusions:
The results suggest that GQDs 130 and GQDs 150 are ideal candidates for nanomedicine applications, e.g., drug/gene delivery and bio-imaging, etc.
Aim:
This study aims to discover an alternative precursor with abundant source and low cost for multicolor graphene quantum dots (GQDs) preparation and application.
Methods:
In the current study, anthracite-derived multicolor GQDs were prepared at different reaction temperatures (100°–150°C), referring to the GQDs 100, GQDs 120, GQDs 130, and GQDs 150.
Results:
The GQDs 100, GQDs 120, GQDs 130, and GQDs 150 solutions were found to be orange-red, yellow-green, green, and blue under 365 nm excitation UV (ultraviolet) lamp, respectively. The X-ray photoelectron spectroscopy (XPS) data suggests high temperature intensifies oxidation of the amorphous sp3 carbon, resulting in GQDs with higher crystalline structure (Csp2). Compared with the GQDs 100 and GQDs 120, the GQDs 130 and GQDs 150 showed much better biocompatibility, which may attribute to their higher Csp2 composition and smaller size.
Conclusions:
The results suggest that GQDs 130 and GQDs 150 are ideal candidates for nanomedicine applications, e.g., drug/gene delivery and bio-imaging, etc.
DOI: https://doi.org/10.37349/ebmx.2023.00003
Translating biomaterials research into clinical products is a multidisciplinary yet rewarding journey. It should primarily aim to improve patient treatment and clinical outcomes by addressing unmet clinical needs. Four examples of commercial development of biomaterial implants illustrate the diversity of paths, starting from academic research work (AlchiMedics, TISSIUM, Cousin Surgery) or corporate initiatives to develop new products (Medtronic-Sofradim Production). They have been selected from the Translational Research session of the 2022 Conference of the European Society for Biomaterials (ESB) in Bordeaux (France). Commitment, agility, and perseverance were among the key common skills to successfully meet challenges, especially the most unexpected ones. All dimensions of translation projects must be integrated from the start, including the regulatory strategy.
Translating biomaterials research into clinical products is a multidisciplinary yet rewarding journey. It should primarily aim to improve patient treatment and clinical outcomes by addressing unmet clinical needs. Four examples of commercial development of biomaterial implants illustrate the diversity of paths, starting from academic research work (AlchiMedics, TISSIUM, Cousin Surgery) or corporate initiatives to develop new products (Medtronic-Sofradim Production). They have been selected from the Translational Research session of the 2022 Conference of the European Society for Biomaterials (ESB) in Bordeaux (France). Commitment, agility, and perseverance were among the key common skills to successfully meet challenges, especially the most unexpected ones. All dimensions of translation projects must be integrated from the start, including the regulatory strategy.
DOI: https://doi.org/10.37349/ebmx.2024.00004
Aim:
This study aimed to examine the amount of surface non-specific adsorption, or fouling, observed by Pseudomonas aeruginosa (P. aeruginosa) on a quartz crystal based acoustic wave biosensor under different flow conditions with and without an anti-fouling layer.
Methods:
An electromagnetic piezoelectric acoustic sensor (EMPAS) based on electrode free quartz crystals was used to perform the analysis. Phosphate buffered saline (PBS) was flowed over the crystal surface at various flow rates from 50 μL/min to 200 μL/min, with measurements being taken at the 43rd harmonic (~864 MHz). The crystal was either unmodified, or modified with a monoethylene glycol [2-(3-silylpropyloxy)-hydroxy-ethyl (MEG-OH)] anti-fouling layer. Overnight culture of P. aeruginosa PAO1 (PAO1) in lysogeny broth (LB) was injected into the system, and flow maintained for 30 min.
Results:
The frequency change of the EMPAS crystal after injection of bacteria into the system was found to change based on the flow rate of buffer, suggesting the flow rate has a strong effect on the level of non-specific adsorption. The MEG-OH layer drastically reduced the level of fouling observed under all flow conditions, as well as reduced the amount of variation between experiments. Flow rates of 150 μL/min or higher were found to best reduce the level of fouling observed as well as experimental variation.
Conclusions:
The MEG-OH anti-fouling layer is important for accurate and reproducible biosensing measurements due to the reduced fouling and variation during experiments. Additionally, a flow rate of 150 μL/min may prove better for measurement compared to the current standard of 50 μL/min for this type of instrument.
Aim:
This study aimed to examine the amount of surface non-specific adsorption, or fouling, observed by Pseudomonas aeruginosa (P. aeruginosa) on a quartz crystal based acoustic wave biosensor under different flow conditions with and without an anti-fouling layer.
Methods:
An electromagnetic piezoelectric acoustic sensor (EMPAS) based on electrode free quartz crystals was used to perform the analysis. Phosphate buffered saline (PBS) was flowed over the crystal surface at various flow rates from 50 μL/min to 200 μL/min, with measurements being taken at the 43rd harmonic (~864 MHz). The crystal was either unmodified, or modified with a monoethylene glycol [2-(3-silylpropyloxy)-hydroxy-ethyl (MEG-OH)] anti-fouling layer. Overnight culture of P. aeruginosa PAO1 (PAO1) in lysogeny broth (LB) was injected into the system, and flow maintained for 30 min.
Results:
The frequency change of the EMPAS crystal after injection of bacteria into the system was found to change based on the flow rate of buffer, suggesting the flow rate has a strong effect on the level of non-specific adsorption. The MEG-OH layer drastically reduced the level of fouling observed under all flow conditions, as well as reduced the amount of variation between experiments. Flow rates of 150 μL/min or higher were found to best reduce the level of fouling observed as well as experimental variation.
Conclusions:
The MEG-OH anti-fouling layer is important for accurate and reproducible biosensing measurements due to the reduced fouling and variation during experiments. Additionally, a flow rate of 150 μL/min may prove better for measurement compared to the current standard of 50 μL/min for this type of instrument.
DOI: https://doi.org/10.37349/ebmx.2023.00002
Aim:
Small defects after any injury to the periperal nerves results in self-regeneration. However, for larger defects, suturing or grafting are necessary, which may have limitations. Thus, research on nerve guidence conduits is needed without drawbacks. The aim of the study was to develop hydrogel-based conduits containing interpenetrating network (IPN).
Methods:
Methacrylated gelatin (GelMA)-methacrylated hyaluronic acid (HaMA) IPN was filled the poly(2-hydroxyethylmethacrylate) (pHEMA) the outer conduit. Schwann cells (SCs) were used on the pHEMA and the distal end of the tube was injected with netrin-1 to support model SH-SY5Y cells.
Results:
1H-nuclear magnetic resonance (1H-NMR) showed that methacrylation degrees were 94% ± 2% for GelMA and 60% ± 7% for HaMA. The fraction of HaMA increased the degradation rate; pure HaMA degraded in 3 weeks, while pure GelMA in more than 5 weeks. An increase in the fraction of 2-hydroxyethylmethacrylate (HEMA) from 20% to 56% decreased the porosity and the pore size, significantly. SH-SY5Y cells migrated along the conduit in the presence of netrin-1. NeuN expression was increased in 2 weeks indicating neuronal activity.
Conclusions:
SH-SY5Y cells produced neurites in the IPN. pHEMA conduit including GelMA-HaMA IPN is a good candidate for peripheral nerve regeneration applications. As future studies, the conduit will be tested in vivo for nerve regeneration.
Aim:
Small defects after any injury to the periperal nerves results in self-regeneration. However, for larger defects, suturing or grafting are necessary, which may have limitations. Thus, research on nerve guidence conduits is needed without drawbacks. The aim of the study was to develop hydrogel-based conduits containing interpenetrating network (IPN).
Methods:
Methacrylated gelatin (GelMA)-methacrylated hyaluronic acid (HaMA) IPN was filled the poly(2-hydroxyethylmethacrylate) (pHEMA) the outer conduit. Schwann cells (SCs) were used on the pHEMA and the distal end of the tube was injected with netrin-1 to support model SH-SY5Y cells.
Results:
1H-nuclear magnetic resonance (1H-NMR) showed that methacrylation degrees were 94% ± 2% for GelMA and 60% ± 7% for HaMA. The fraction of HaMA increased the degradation rate; pure HaMA degraded in 3 weeks, while pure GelMA in more than 5 weeks. An increase in the fraction of 2-hydroxyethylmethacrylate (HEMA) from 20% to 56% decreased the porosity and the pore size, significantly. SH-SY5Y cells migrated along the conduit in the presence of netrin-1. NeuN expression was increased in 2 weeks indicating neuronal activity.
Conclusions:
SH-SY5Y cells produced neurites in the IPN. pHEMA conduit including GelMA-HaMA IPN is a good candidate for peripheral nerve regeneration applications. As future studies, the conduit will be tested in vivo for nerve regeneration.
DOI: https://doi.org/10.37349/ebmx.2024.00005
This article belongs to the special issue Nature-Based Biomaterials for Biomedical Applications
Aim:
The chronicity of injuries is also a public health problem, and it is necessary to develop and apply new materials to promote more satisfactory results in the wound healing. Thus, this study aims to develop natural polymer films based on a combination of κ-carrageenan and sodium alginate, crosslinked with Zn2+, for the controlled delivery of mupirocin (MUP).
Methods:
Vibrational spectroscopy (Raman and infrared spectroscopies) was used to characterize the chemical structure and crosslinking process. Micro-Raman imaging and scanning electron microscopy were employed to observe the spatial distribution of the polymers and morphology of the samples, respectively. The uniformity (in terms of mass, thickness, and MUP concentration) of the films, MUP release kinetics, and their bactericidal activity were subjected to analysis.
Results:
The films exhibited good uniformity in terms of thickness, mass, and quantity of MUP. However, the percentage of antibiotics was lower than that added, indicating losses during the film production process. Swelling and release kinetic studies indicated good swelling capacity of the films and controlled drug delivery process. The antibacterial activity of the films was determined against Staphylococcus aureus, Escherichia coli, Staphylococcus epidermidis, and Pseudomonas aeruginosa using the zone of inhibition method. All films produced showed activity against the growth of these bacteria.
Conclusions:
The results illustrate the potential of employing κ-carrageenan and sodium alginate in the fabrication of polymeric films for the regulated release of MUP, with the aim of developing wound dressings that can improve wound healing outcomes.
Aim:
The chronicity of injuries is also a public health problem, and it is necessary to develop and apply new materials to promote more satisfactory results in the wound healing. Thus, this study aims to develop natural polymer films based on a combination of κ-carrageenan and sodium alginate, crosslinked with Zn2+, for the controlled delivery of mupirocin (MUP).
Methods:
Vibrational spectroscopy (Raman and infrared spectroscopies) was used to characterize the chemical structure and crosslinking process. Micro-Raman imaging and scanning electron microscopy were employed to observe the spatial distribution of the polymers and morphology of the samples, respectively. The uniformity (in terms of mass, thickness, and MUP concentration) of the films, MUP release kinetics, and their bactericidal activity were subjected to analysis.
Results:
The films exhibited good uniformity in terms of thickness, mass, and quantity of MUP. However, the percentage of antibiotics was lower than that added, indicating losses during the film production process. Swelling and release kinetic studies indicated good swelling capacity of the films and controlled drug delivery process. The antibacterial activity of the films was determined against Staphylococcus aureus, Escherichia coli, Staphylococcus epidermidis, and Pseudomonas aeruginosa using the zone of inhibition method. All films produced showed activity against the growth of these bacteria.
Conclusions:
The results illustrate the potential of employing κ-carrageenan and sodium alginate in the fabrication of polymeric films for the regulated release of MUP, with the aim of developing wound dressings that can improve wound healing outcomes.
DOI: https://doi.org/10.37349/ebmx.2025.101326
The design of effective treatments for critical size bone defects, which result from various conditions such as trauma, infection, injury, or tumor resection, presents a significant challenge in clinical practice. While autologous grafts are commonly regarded as gold standard treatments in these complex healing scenarios, they are often associated with notable limitations, including donor site morbidity and limited graft volume. As a result, recent research trends have shifted towards developing biomaterials that better emulate the inherent complexity of the native bone structure and function through implementation of a “Diamond Concept” polytherapy strategy. Central to this approach is the utilization of biomaterials, increasingly composed of composite materials that integrate bioactive osteoinductive factors and cell sources to enhance healing outcomes. The usage of Wnt signaling specific agonists as osteoinductive mediators has been recently shown to be a promising strategy for promoting healing, as this pathway is well established to have an important role in both osteogenic differentiation and bone formation processes. Implementation of a localized delivery system through scaffold incorporation is necessary in this scenario, however, to minimize any potential off-target effects caused by the Wnt signaling cascade’s non-specificity to bone. Findings in the literature clearly show that this approach holds promise to improve clinical healing outcomes, paving the way for more effective treatment options. In this review, we will generally discuss the design of biomaterials, specifically bulk materials and composites, for the treatment of critical size bone defects. Additionally, we will highlight recent work on the design of chitosan-based scaffolds modified with purine crosslinking, to overcome cytotoxicity issues associated with other chemical crosslinkers. In this context, we focus on optimizing material design for this bone healing application and discuss the benefits of localized Wnt agonist as mediators to improve the scaffold’s osteoinductive behavior.
The design of effective treatments for critical size bone defects, which result from various conditions such as trauma, infection, injury, or tumor resection, presents a significant challenge in clinical practice. While autologous grafts are commonly regarded as gold standard treatments in these complex healing scenarios, they are often associated with notable limitations, including donor site morbidity and limited graft volume. As a result, recent research trends have shifted towards developing biomaterials that better emulate the inherent complexity of the native bone structure and function through implementation of a “Diamond Concept” polytherapy strategy. Central to this approach is the utilization of biomaterials, increasingly composed of composite materials that integrate bioactive osteoinductive factors and cell sources to enhance healing outcomes. The usage of Wnt signaling specific agonists as osteoinductive mediators has been recently shown to be a promising strategy for promoting healing, as this pathway is well established to have an important role in both osteogenic differentiation and bone formation processes. Implementation of a localized delivery system through scaffold incorporation is necessary in this scenario, however, to minimize any potential off-target effects caused by the Wnt signaling cascade’s non-specificity to bone. Findings in the literature clearly show that this approach holds promise to improve clinical healing outcomes, paving the way for more effective treatment options. In this review, we will generally discuss the design of biomaterials, specifically bulk materials and composites, for the treatment of critical size bone defects. Additionally, we will highlight recent work on the design of chitosan-based scaffolds modified with purine crosslinking, to overcome cytotoxicity issues associated with other chemical crosslinkers. In this context, we focus on optimizing material design for this bone healing application and discuss the benefits of localized Wnt agonist as mediators to improve the scaffold’s osteoinductive behavior.
DOI: https://doi.org/10.37349/ebmx.2025.101327
Aim:
This work aimed to evaluate the antiproliferative activity of silver nanoparticles (AgNPs) biosynthesized with aqueous extract of Stenocereus queretaroensis peel (SAgNPs) in pancreatic ductal cancer cells PANC-1.
Methods:
Nanoparticles were synthesized using 2 mM silver nitrate (AgNO3) and a 1% aqueous extract of Stenocereus queretaroensis peel. SAgNPs were characterized by ultraviolet-visible spectroscopy (UV-Vis) light spectroscopy, dynamic light scattering analysis, and transmission electron microscopy. The antiproliferative activity was evaluated in the PANC-1 cell line by measuring the viability percentage with the 3'-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) method and subsequently the IC50 of SAgNPs.
Results:
The presence of AgNPs was confirmed by silver surface plasmon resonance at 420 nm. The average size obtained by dynamic light scattering analysis was 98.96 nm, with a spherical and uniform shape according to transmission electron microscopy analysis. SAgNPs were tested at concentrations from 10 µg/mL to 0.3125 µg/mL and presented inhibition percentages from 3.76% to 90.09% with an IC50 value of 3.04 µg/mL (p-value of 0.02, 95% confidence level) in PANC-1 cells.
Conclusions:
The biologically synthesized nanoparticles with Stenocereus queretaroensis peel showed antiproliferative activity in PANC-1 pancreatic cancer cells. Therefore, these results suggest their potential use in the prevention and treatment of pancreatic cancer with further investigation.
Aim:
This work aimed to evaluate the antiproliferative activity of silver nanoparticles (AgNPs) biosynthesized with aqueous extract of Stenocereus queretaroensis peel (SAgNPs) in pancreatic ductal cancer cells PANC-1.
Methods:
Nanoparticles were synthesized using 2 mM silver nitrate (AgNO3) and a 1% aqueous extract of Stenocereus queretaroensis peel. SAgNPs were characterized by ultraviolet-visible spectroscopy (UV-Vis) light spectroscopy, dynamic light scattering analysis, and transmission electron microscopy. The antiproliferative activity was evaluated in the PANC-1 cell line by measuring the viability percentage with the 3'-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) method and subsequently the IC50 of SAgNPs.
Results:
The presence of AgNPs was confirmed by silver surface plasmon resonance at 420 nm. The average size obtained by dynamic light scattering analysis was 98.96 nm, with a spherical and uniform shape according to transmission electron microscopy analysis. SAgNPs were tested at concentrations from 10 µg/mL to 0.3125 µg/mL and presented inhibition percentages from 3.76% to 90.09% with an IC50 value of 3.04 µg/mL (p-value of 0.02, 95% confidence level) in PANC-1 cells.
Conclusions:
The biologically synthesized nanoparticles with Stenocereus queretaroensis peel showed antiproliferative activity in PANC-1 pancreatic cancer cells. Therefore, these results suggest their potential use in the prevention and treatment of pancreatic cancer with further investigation.
DOI: https://doi.org/10.37349/ebmx.2025.101328
Aim:
This study aimed to synthesize, characterize, and evaluate the antifungal efficacy of green-synthesized silver nanoparticles (AgNPs) against Verticillium dahliae Kleb., a soil-borne fungal pathogen that affects numerous crops.
Methods:
AgNPs were synthesized using Laurus nobilis L. (laurel) leaf extract. The synthesized AgNPs were characterized using UV-VIS spectroscopy, Fourier-Transform Infrared Spectroscopy (FTIR), zeta potential, particle size analysis (PSA), and scanning electron microscopy (SEM). In vitro antifungal assays were conducted to assess the impact of AgNPs on V. dahliae mycelial growth, and SEM was used to examine the morphological changes in treated mycelium.
Results:
UV-VIS spectroscopy confirmed AgNP synthesis with a characteristic SPR peak between 400–450 nm. FTIR analysis identified the presence of phenolic compounds on the nanoparticle surface. Zeta potential analysis (–27.7 mV) indicated stable dispersion. Zeta size analysis indicated an average diameter of approximately 100 nm and a polydispersity index (PdI) of 0.229. SEM imaging confirmed a predominantly spherical morphology and PSA revealed a size range of 14–34 nm, with an average diameter of 24 nm. In vitro antifungal assays showed significant inhibition of V. dahliae mycelial growth, with radial mycelial growth reduced to 2.75 cm compared to 4.8–6.4 cm in the control group after 14 days. SEM imaging of treated mycelium revealed pronounced morphological damage, including collapse and shrinkage of hyphae and spores.
Conclusions:
Green-synthesized AgNPs using L. nobilis leaf extract demonstrated significant antifungal activity against V. dahliae. The observed inhibition of mycelial growth and morphological damage suggests the potential of these AgNPs as a sustainable and eco-friendly alternative for managing this fungal pathogen. The antifungal mechanism may involve membrane disruption, increased permeability, oxidative stress, and the inactivation of cellular components.
Aim:
This study aimed to synthesize, characterize, and evaluate the antifungal efficacy of green-synthesized silver nanoparticles (AgNPs) against Verticillium dahliae Kleb., a soil-borne fungal pathogen that affects numerous crops.
Methods:
AgNPs were synthesized using Laurus nobilis L. (laurel) leaf extract. The synthesized AgNPs were characterized using UV-VIS spectroscopy, Fourier-Transform Infrared Spectroscopy (FTIR), zeta potential, particle size analysis (PSA), and scanning electron microscopy (SEM). In vitro antifungal assays were conducted to assess the impact of AgNPs on V. dahliae mycelial growth, and SEM was used to examine the morphological changes in treated mycelium.
Results:
UV-VIS spectroscopy confirmed AgNP synthesis with a characteristic SPR peak between 400–450 nm. FTIR analysis identified the presence of phenolic compounds on the nanoparticle surface. Zeta potential analysis (–27.7 mV) indicated stable dispersion. Zeta size analysis indicated an average diameter of approximately 100 nm and a polydispersity index (PdI) of 0.229. SEM imaging confirmed a predominantly spherical morphology and PSA revealed a size range of 14–34 nm, with an average diameter of 24 nm. In vitro antifungal assays showed significant inhibition of V. dahliae mycelial growth, with radial mycelial growth reduced to 2.75 cm compared to 4.8–6.4 cm in the control group after 14 days. SEM imaging of treated mycelium revealed pronounced morphological damage, including collapse and shrinkage of hyphae and spores.
Conclusions:
Green-synthesized AgNPs using L. nobilis leaf extract demonstrated significant antifungal activity against V. dahliae. The observed inhibition of mycelial growth and morphological damage suggests the potential of these AgNPs as a sustainable and eco-friendly alternative for managing this fungal pathogen. The antifungal mechanism may involve membrane disruption, increased permeability, oxidative stress, and the inactivation of cellular components.
DOI: https://doi.org/10.37349/ebmx.2025.101329
Aim:
In this study, the physicochemical properties of stearyl glycyrrhetinate/β-cyclodextrin (SG/βCD) and SG/γCD complexes were characterized, and the complexes were prepared using the co-milling method. The molecular interactions within the SG/CD complexes were also investigated using nuclear magnetic resonance (NMR) measurements to determine the mode of interaction.
Methods:
Here, we evaluated the physicochemical properties of SG complexes with CDs prepared by ground mixtures (GM SG/βCD or γCD = 1/1, 1/2).
Results:
Powder X-ray diffraction (PXRD) showed that the characteristic SG and CD peaks disappeared after co-grinding with GM (SG/CD = molar ratio of 1/2), indicating a halo pattern. Differential scanning calorimetry (DSC) measurements showed that after co-grinding, the endothermic peak due to SG melting, as well as the dehydration peak and the endothermic peak due to SG melting, disappeared. Near-infrared (NIR) spectroscopy results showed that the peaks of SG-derived –CH moieties and CD-derived –OH and –CH moieties broadened in GM, suggesting their involvement in complex formation through SG/CDs intermolecular interactions. In GM (SG/CDs), NMR measurements showed broadened H-A and H-F peaks of the steroid skeleton derived from SG. In GM (SG/βCD = 1/2), the doublet peak, especially OH-3 at the wide edge of CD, shifted to a singlet peak. In GM (SG/γCD = 1/2), the H-3 peak, which is the wide edge of γCD, and the H-6 peak, which is the narrow edge, shifted to broad peaks, suggesting that γCD is deeply encapsulated in the steroidal structure.
Conclusions:
These findings suggest that complex formation occurred in SG/CDs and that inclusion behavior is different between GM (SG/βCD = 1/2) and GM (SG/γCD = 1/2).
Aim:
In this study, the physicochemical properties of stearyl glycyrrhetinate/β-cyclodextrin (SG/βCD) and SG/γCD complexes were characterized, and the complexes were prepared using the co-milling method. The molecular interactions within the SG/CD complexes were also investigated using nuclear magnetic resonance (NMR) measurements to determine the mode of interaction.
Methods:
Here, we evaluated the physicochemical properties of SG complexes with CDs prepared by ground mixtures (GM SG/βCD or γCD = 1/1, 1/2).
Results:
Powder X-ray diffraction (PXRD) showed that the characteristic SG and CD peaks disappeared after co-grinding with GM (SG/CD = molar ratio of 1/2), indicating a halo pattern. Differential scanning calorimetry (DSC) measurements showed that after co-grinding, the endothermic peak due to SG melting, as well as the dehydration peak and the endothermic peak due to SG melting, disappeared. Near-infrared (NIR) spectroscopy results showed that the peaks of SG-derived –CH moieties and CD-derived –OH and –CH moieties broadened in GM, suggesting their involvement in complex formation through SG/CDs intermolecular interactions. In GM (SG/CDs), NMR measurements showed broadened H-A and H-F peaks of the steroid skeleton derived from SG. In GM (SG/βCD = 1/2), the doublet peak, especially OH-3 at the wide edge of CD, shifted to a singlet peak. In GM (SG/γCD = 1/2), the H-3 peak, which is the wide edge of γCD, and the H-6 peak, which is the narrow edge, shifted to broad peaks, suggesting that γCD is deeply encapsulated in the steroidal structure.
Conclusions:
These findings suggest that complex formation occurred in SG/CDs and that inclusion behavior is different between GM (SG/βCD = 1/2) and GM (SG/γCD = 1/2).
DOI: https://doi.org/10.37349/ebmx.2025.101330
This article belongs to the special issue Nature-Based Biomaterials for Biomedical Applications
A potential solution for prosthetic heart valves is tissue-engineered heart valves. Tissue-engineered heart valves (TEHVs) are designed to replicate the complex properties found in natural tissues, such as stiffness, anisotropy, and composition and organization of cells and extracellular matrix (ECM). Electrospinning is regarded as a highly versatile and innovative approach for fabricating numerous fibrous designs. In this review, we discuss recent developments in electrospun heart valve scaffolds, including scaffold materials, cell types, and electrospinning setups used to prepare aligned nanofibers. Despite the fact that natural biomaterials provided excellent biocompatibility, nanofibers from synthetic materials provided the required mechanical compatibility. Accordingly, most studies highlighted the benefits of designing composite heart valves using biological and synthetic polymers. Various strategies, such as the application of motorized mandrel and micropatterned collector in electrospinning were effective in controlling nanofiber alignment. Studies also showed that aligned nanofiber’s mechanical strength and anisotropic structure promote cell proliferation, and differentiation, and promote attachment. Numerous studies have reported that multiple cell sources are suitable for producing heart valves. Successful results were obtained with human umbilical vein endothelial cells (HUVECs), since they provide a convenient cell source for cellularization of valve leaflets. A higher conductivity of scaffolds was achieved by using biomaterials that conduct electricity, such as polyaniline, polypyrrole, and carbon nanotubes, which resulted in better differentiation of precursor cells to cardiomyocytes and higher cell beating rates. In light of these attributes, nanofibrous scaffolds produced through electrospinning are expected to offer numerous advantages for tissue engineering and medical applications in the near future. However, multiple challenges were identified as cell infiltration and 2D nature of nanofiber mats necessitate further engineering approaches in electrospinning procedure leaflet production.
A potential solution for prosthetic heart valves is tissue-engineered heart valves. Tissue-engineered heart valves (TEHVs) are designed to replicate the complex properties found in natural tissues, such as stiffness, anisotropy, and composition and organization of cells and extracellular matrix (ECM). Electrospinning is regarded as a highly versatile and innovative approach for fabricating numerous fibrous designs. In this review, we discuss recent developments in electrospun heart valve scaffolds, including scaffold materials, cell types, and electrospinning setups used to prepare aligned nanofibers. Despite the fact that natural biomaterials provided excellent biocompatibility, nanofibers from synthetic materials provided the required mechanical compatibility. Accordingly, most studies highlighted the benefits of designing composite heart valves using biological and synthetic polymers. Various strategies, such as the application of motorized mandrel and micropatterned collector in electrospinning were effective in controlling nanofiber alignment. Studies also showed that aligned nanofiber’s mechanical strength and anisotropic structure promote cell proliferation, and differentiation, and promote attachment. Numerous studies have reported that multiple cell sources are suitable for producing heart valves. Successful results were obtained with human umbilical vein endothelial cells (HUVECs), since they provide a convenient cell source for cellularization of valve leaflets. A higher conductivity of scaffolds was achieved by using biomaterials that conduct electricity, such as polyaniline, polypyrrole, and carbon nanotubes, which resulted in better differentiation of precursor cells to cardiomyocytes and higher cell beating rates. In light of these attributes, nanofibrous scaffolds produced through electrospinning are expected to offer numerous advantages for tissue engineering and medical applications in the near future. However, multiple challenges were identified as cell infiltration and 2D nature of nanofiber mats necessitate further engineering approaches in electrospinning procedure leaflet production.
DOI: https://doi.org/10.37349/ebmx.2025.101331
This article belongs to the special issue Trends in Biomaterials Research for Cardiovascular Applications
Mineral nanoparticles and osteoinductive biomaterials are essential in advancing bone regeneration by addressing skeletal conditions and injuries that compromise structural integrity and functionality. These biomaterials stimulate the differentiation of precursor cells into osteoblasts, creating biocompatible environments conducive to bone tissue regeneration. Among the most promising innovations, mineral-based nanoparticles and nanocomposite hydrogels have emerged as effective strategies for enhancing osteoinductive potential. This review explores the diverse types of osteoinductive biomaterials, including natural sources, synthetic compounds, and hybrid designs that incorporate mineralized nanoparticles. Emphasis is placed on polymeric hydrogels as delivery platforms for these materials, highlighting their dual role as structural supports and bioactive agents that promote osteogenesis. Challenges such as immune rejection, biodegradability, mechanical stability, and short in vivo residence time are critically discussed, alongside their impact on clinical translation. By presenting a comprehensive analysis of mechanisms, applications, and limitations, this review identifies opportunities for integrating osteoinductive biomaterials with emerging fields like immunology and biomechanics. Ultimately, this work aims to provide actionable insights and advance the development of novel, clinically relevant solutions that improve patient outcomes and address the growing global need for effective bone repair and regeneration.
Mineral nanoparticles and osteoinductive biomaterials are essential in advancing bone regeneration by addressing skeletal conditions and injuries that compromise structural integrity and functionality. These biomaterials stimulate the differentiation of precursor cells into osteoblasts, creating biocompatible environments conducive to bone tissue regeneration. Among the most promising innovations, mineral-based nanoparticles and nanocomposite hydrogels have emerged as effective strategies for enhancing osteoinductive potential. This review explores the diverse types of osteoinductive biomaterials, including natural sources, synthetic compounds, and hybrid designs that incorporate mineralized nanoparticles. Emphasis is placed on polymeric hydrogels as delivery platforms for these materials, highlighting their dual role as structural supports and bioactive agents that promote osteogenesis. Challenges such as immune rejection, biodegradability, mechanical stability, and short in vivo residence time are critically discussed, alongside their impact on clinical translation. By presenting a comprehensive analysis of mechanisms, applications, and limitations, this review identifies opportunities for integrating osteoinductive biomaterials with emerging fields like immunology and biomechanics. Ultimately, this work aims to provide actionable insights and advance the development of novel, clinically relevant solutions that improve patient outcomes and address the growing global need for effective bone repair and regeneration.
DOI: https://doi.org/10.37349/ebmx.2025.101332
Aim:
Synthesis of plasmonic nanoparticles, characterization, size detection by modeling.
Methods:
Colloidal plasmonic gold and silver nanoparticles were prepared by laser ablation with a 1,064 nm pulsed Nd:YAG laser with equal fractional volume and then were illuminated with its 532 nm second harmonic pulse. After the illumination process, we observed 1 nm blue shift in peak position of gold colloid and 4 nm blue shift in silver colloid. We observed a variation in the dielectric function due to nanoparticle size reduction in both samples. Using micrograph, size distribution was plotted and with the help of Mie theory and size dependent dielectric function, we reconstructed absorption spectrum to best fit the experimental spectrum and we estimated 12- and 16-fold increase in the number of Au and Ag nanoparticles respectively, due to illumination.
Results:
We have estimated size distribution of produced nanoparticles.
Conclusions:
We produced silver and gold colloids with ablation of their foils in water without any surfactant, and then we fragmented the nanoparticles colloids with an intense nanosecond laser and studied the effect of illumination on peak position and size distribution of colloids.
Aim:
Synthesis of plasmonic nanoparticles, characterization, size detection by modeling.
Methods:
Colloidal plasmonic gold and silver nanoparticles were prepared by laser ablation with a 1,064 nm pulsed Nd:YAG laser with equal fractional volume and then were illuminated with its 532 nm second harmonic pulse. After the illumination process, we observed 1 nm blue shift in peak position of gold colloid and 4 nm blue shift in silver colloid. We observed a variation in the dielectric function due to nanoparticle size reduction in both samples. Using micrograph, size distribution was plotted and with the help of Mie theory and size dependent dielectric function, we reconstructed absorption spectrum to best fit the experimental spectrum and we estimated 12- and 16-fold increase in the number of Au and Ag nanoparticles respectively, due to illumination.
Results:
We have estimated size distribution of produced nanoparticles.
Conclusions:
We produced silver and gold colloids with ablation of their foils in water without any surfactant, and then we fragmented the nanoparticles colloids with an intense nanosecond laser and studied the effect of illumination on peak position and size distribution of colloids.
DOI: https://doi.org/10.37349/ebmx.2024.00021
This article belongs to the special issue Plasmonic Nanostructures for Designing Optical Biosensors
