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Marija Ðošic,Sanja Erakovic,Ana Jankovic,Maja Vukašinovic-Sekulic,Ivana Z. Matic,Jovica Stojanovic,이경엽,Vesna Miškovic-Stankovic,박수진 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.47 No.-
Graphene (Gr) and natural polymer chitosan (CS) were introduced to hydroxyapatite (HAP) to produce athree-component composite coating, which was fabricated by cathodic electrophoretic deposition on Tisubstrates in an ethanol suspension. These HAP/CS/Gr coatings were characterized by X-ray diffraction(XRD), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), X-rayphotoelectron spectroscopy (XPS) and electrochemical measurements and found that the graphene intoHAP/CS composites significantly improves their morphology, thermal stability, and bioactivity. BothHAP/CS and HAP/CS/Gr composite coatings are classified as non-cytotoxic when tested against healthyperipheral blood mononuclear cells (PBMC), while antibacterial activity against Staphylococcus aureusand Escherichia coli could not be verified.
Katarina Nešovi c,Ana Jankovic,Aleksandra Peri c-Gruji c,Maja Vukašinovic-Sekulic,Tamara Radeti c,Ljiljana Živkovi c,박수진,이경엽,Vesna Miškovi c-Stankovi c 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.77 No.-
Silver nanoparticles (AgNPs) were synthesized by in situ electrochemical reduction of Ag+ ions in poly(vinyl alcohol)/chitosan/graphene (PVA/CHI/Gr) hydrogel matrices with different concentrations ofchitosan. The physicochemical properties of nanocomposite hydrogels were investigated by UV–visspectroscopy (UV–vis), dynamic light scattering (DLS), transmission electron microscopy (TEM), X-rayphotoelectron spectroscopy (XPS),field-emission scanning electron microscopy (FE-SEM) and Fourier-transform infrared spectroscopy (FT-IR), thermal characteristics were determined by differentialscanning calorimetry (DSC) and mechanical properties were measured by tensile test. The swellingstudies were carried out in phosphate buffer to simulate natural physiological environment and datawerefitted by several kinetic models to determine the diffusion mechanism and diffusion coefficients ofthe swelling medium through the hydrogel matrices. It was shown that the presence of silvernanoparticles increased the uptake capability and equilibrium swelling degree of the compositehydrogels. The antibacterial activity was confirmed against Escherichia coli and Staphylococcus aureus,while the hydrogels without AgNPs exhibited antibacterial properties due to the presence of chitosan. With the addition of AgNPs, the samples showed stronger activity and fast reduction in the number ofcolonies, confirming the synergistic effect of chitosan and AgNPs on the antibacterial activity.