Collagen-based silver nanoparticles for biological applications: synthesis and characterization

Abstract\ud \ud Background\ud Type I collagen is an abundant natural polymer with several applications in medicine as matrix to regenerate tissues. Silver nanoparticles is an important nanotechnology material with many utilities in some areas such as medicine, biology and chemistry. The present study focused on the synthesis of silver nanoparticles (AgNPs) stabilized with type I collagen (AgNPcol) to build a nanomaterial with biological utility. Three formulations of AgNPcol were physicochemical characterized, antibacterial activity in vitro and cell viability assays were analyzed. AgNPcol was characterized by means of the following: ultraviolet–visible spectroscopy, dynamic light scattering analysis, Fourier transform infrared spectroscopy, atomic absorption analysis, transmission electron microscopy and of X-ray diffraction analysis.\ud \ud \ud Results\ud All AgNPcol showed spherical and positive zeta potential. The AgNPcol at a molar ratio of 1:6 showed better characteristics, smaller hydrodynamic diameter (64.34 ± 16.05) and polydispersity index (0.40 ± 0.05), and higher absorbance and silver reduction efficiency (0.645 mM), when compared with the particles prepared in other mixing ratios. Furthermore, these particles showed antimicrobial activity against both Staphylococcus aureus and Escherichia coli and no toxicity to the cells at the examined concentrations.\ud \ud \ud Conclusions\ud The resulted particles exhibited favorable characteristics, including the spherical shape, diameter between 64.34 nm and 81.76 nm, positive zeta potential, antibacterial activity, and non-toxicity to the tested cells (OSCC).FAPESP (14/02282-6)CAPES (AUX-PERM-705/2009)

Preparation and cytotoxicity of lipid nanocarriers containing a hydrophobic flavanone

International audienceHesperetin is a flavanone with recognized biological activities. However, such activities are limited due to its restricted aqueous solubility and stability. In this regard, the main aim of this study was to develop and characterize lipid nanocarriers containing hesperetin. Nanostructured lipid carriers (NLC) were prepared using phase inversion temperature method and characterized by size, polydispersity index (PdI), zeta potential, physical stability, TEM analysis, encapsulation efficiency, in vitro release, and in vitro cytotoxic effect in cell line. Lipid nanocarriers presented diameter below 80 nm, narrow PdI (<0.2), and negative zeta potential (–20 mV). Accelerated stability studies of NLC demonstrated good physical stability for a period of 12 months. According to TEM, NLC were almost spherical with particle size <100 nm and homogeneous size distribution. DSC curves showed that formulations presented lipid core with a higher degree of crystalline disorder. Lipid nanocarriers were able to entrap hesperitin with efficiency 72.7 % (±0.92). In vitro release studies confirmed that NLC could modulate hesperetin release during 72 h. In vitro cytotoxicity assay of hesperitin-loaded NLC on T98G glioblastoma grade IV cells presented significant cytotoxic effect. Therefore, NLC were able to encapsulate successfully hesperetin and demonstrated excellent in vitro cytotoxicity on glioblastoma cells

Collagen-based silver nanoparticles for biological applications: synthesis and characterization

Abstract Background Type I collagen is an abundant natural polymer with several applications in medicine as matrix to regenerate tissues. Silver nanoparticles is an important nanotechnology material with many utilities in some areas such as medicine, biology and chemistry. The present study focused on the synthesis of silver nanoparticles (AgNPs) stabilized with type I collagen (AgNPcol) to build a nanomaterial with biological utility. Three formulations of AgNPcol were physicochemical characterized, antibacterial activity in vitro and cell viability assays were analyzed. AgNPcol was characterized by means of the following: ultraviolet–visible spectroscopy, dynamic light scattering analysis, Fourier transform infrared spectroscopy, atomic absorption analysis, transmission electron microscopy and of X-ray diffraction analysis. Results All AgNPcol showed spherical and positive zeta potential. The AgNPcol at a molar ratio of 1:6 showed better characteristics, smaller hydrodynamic diameter (64.34 ± 16.05) and polydispersity index (0.40 ± 0.05), and higher absorbance and silver reduction efficiency (0.645 mM), when compared with the particles prepared in other mixing ratios. Furthermore, these particles showed antimicrobial activity against both Staphylococcus aureus and Escherichia coli and no toxicity to the cells at the examined concentrations. Conclusions The resulted particles exhibited favorable characteristics, including the spherical shape, diameter between 64.34 nm and 81.76 nm, positive zeta potential, antibacterial activity, and non-toxicity to the tested cells (OSCC)