Study on the antibacterial activity of chitosan film incorporated with Sonneratia ovata leaf extract

Abstract

Chitosan films incorporated with Sonneratia ovata (SO) leaf extract were successfully prepared through a simple mixing method. The results obtained by Scanning Electron Microscope (SEM) analyses showed homogeneous film surface without fracture. The formation of hydrogen interaction between active compounds of SO extract and active NH₂ groups of chitosan was evidenced by Fourier-transform infrared spectroscopy (FTIR) analyses. Besides, 1% of SO concentration (w/v), when incorporated, could improve the antibacterial activity of the chitosan film via inhibitory effects against two pathogenic bacteria, namely Salmonella Typhimurium and Pseudomonas aeruginosa after 24 hour exposure. The obtained results show the promising potential of chitosan film incorporated with Sonneratia ovata leaf extract for food packaging application.