LAUSR

In this study, we have developed phenolic acid grafted chitin-glucan complex via new, simple and effective free radical mediated method by using gallic acid (GA) and chitin-glucan complex. The chemical structure of Gallic acid grafted chitin-glucan complex (GA-g-chitin-glucan complex) was characterized by proton nuclear magnetic resonance (1H-NMR) and Fourier-transform infrared spectroscopy (FT-IR). X-ray diffraction (XRD) result showed that after grafting crystallinity of chitin-glucan complex decreases and rough and porous morphology was observed by Scanning electron microscopy (SEM) due to decreased hydrogen bonds. GA-g-chitin-glucan complex showed excellent biocompatible, better antibacterial activity, and tremendous antioxidant activity in comparison to unmodified chitin-glucan complex. Antibacterial result showed better inhibitory properties of GA-g-chitin-glucan complex than that of unmodified chitin-glucan complex. In antioxidant activity, GA-g-chitin-glucan complex was much higher than chitin-glucan complex examined by two different methods DPPH and ABTS radical scavenging activities. It gives 93.23% for DPPH and 94.63% for ABTS scavenging activity. Therefore, it is expected that GA-g-chitin-glucan complex would be highly applicable in biomedical areas. Graphical abstract Synthesis of GA-g-chitin-glucan complex and its antibacterial & antioxidant property Synthesis of GA-g-chitin-glucan complex and its antibacterial & antioxidant property