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Photochemical crosslinking is a best alternative method when compared to conventional crosslinking methods such as chemical and physical methods, by using vitamins like riboflavin and ascorbic acid as photochemical initiators to enhance the physicochemical properties of collagen poly (vinyl pyrrolidone) blend without any toxic by products. Collagen and poly (vinyl pyrrolidone) blends were investigated by Fourier transform infrared spectroscopy (FTIR), Differential scanning calorimetry (DSC), Swelling studies, Tensile testing and the surface properties were studied by Contact angle measurements and Microscopy. Collagen and PVP blended samples were irradiated with the UV light wavelength λ=300nm for 30 minutes by using 0.03% riboflavin and ascorbic acid as photosensitizers and the samples were air dried at room temperature. Collagen- PVP blended hydrogels showed good swelling properties and the lower contact angles indicate their hydrophilic nature. The photochemical crosslinking also improved the thermal stability of the hydrogels which can be confirmed by broad endothermic peak between 80-180 0 C in the thermoscan. The FTIR spectral changes

Photochemical crosslinking of collagen and Poly (vinyl pyrrolidone) hydrogel system for biomedical applications by using novel photo initiators