Preparation and Characterization of Novel Bionanocomposite Based on Tapioca Starch/Gelatin/Nanorod-rich ZnO: Towards Finding Antimicrobial Coating for Nuts

Authors

Department of Agriculture Science, Damghan Branch, Islamic Azad University, Damghan, Iran

Abstract

The effects of zinc oxide nanorod on the barrier, sorption isotherm and antibacterial properties of tapioca starch/bovine gelatin Bionanocomposite films were investigated. The nanorod-rich ZnO (ZnO-N) was homogenized by sonication and incorporated into tapioca starch/bovine gelatin solutions at different concentrations (e.g. 0.5, 2, and 3.5% w/w dried solid). Incorporation of 3.5% of nanoparticles into tapioca starch/bovin gelatin films decreased the permeability to water vapor by 18%. The addition of low concentration ZnO-N to starch/gelatin solutions significantly decreased monolayer water content of the films. ZnO-N tapioca starch/bovin gelatin films exhibited excellent anti-microbial activity against Staphylococcus aureus and Escherichia coli. The results showed that the Bionanocomposite of ZnO-N has the potential to be an active packaging material in the pharmaceutical and food industries.

Keywords