A PVA hydrogel was prepared by dissolving 1 g of polymer
powder (SigmaeAldrich Art. No. 363146, þ99% Hydrolysed) in
100mL of distilled water undermagnetic stirring at 70 ± 2 C until
complete dissolution had occurred. The chitosan hydrogel was
prepared by dissolving 1 g of chitosan (SigmaeAldrich Art No.