Abstract

DETERMINATION OF ANTIOXIDANT CAPACITY OF NOVEL CHITOSAN OLIGOSACCHARIDE-GRAFT-MALEIC ANHYDRIDE(COS-G-MAH) /POLYVINYL ALCOHOL (PVA)/SILK FIBROIN (SF) COMPOSITE

P. Ajitha, M. Saranya, T. Gomathi* and P. N. Sudha

Abstract

The aim of this study was to assess, using the DPPH assay, the antioxidant activity of several substances that could be proposed to immediately revert the problems. Novel chitosan oligosaccharidegraft- maleic anhydride(COS-g-MAH) /Polyvinyl alcohol (PVA)/silk fibroin (SF) composite for potential antioxidants studies. Initially the chitosan oligosaccharide-graft-maleic anhydride copolymer has been prepared by utilizing ceric ammonium nitrate as an initiator and the optimised graft copolymer was then used for synthesizing COS-g- MAH/PVA/SF composite. The prepared samples were analyzed through FTIR and XRD studies. The FTIR results indicate that the grafted chitosan oligosaccharide copolymer was mixed homogeneously with silk fibroin and polyvinyl alcohol through intermolecular hydrogen bonding. The XRD results elucidate the changes in the crystalline behaviour of the prepared COS-g-MAH/PVA/silk fibroin composite The DPPH assay provides an easy and rapid way to evaluate potential antioxidants.

Keywords: Antioxidant, Composite, DPPH assay.