Preparation and characterization of bio-nanocomposite based on SSPS/nano-SiO2/ harmal essence

In this research casting method was used to prepare soluble soybean polysaccharide (SSPS), based bio-nanocomposite films with nano SiO2 and harmal essence as the reinforcing materials. The composition included 4 g SSPS with 40% (w/w of total solid) of a mixture of the sorbitol/glycerol (weight ratio of 3 to 1 as plasticizer) with nano SiO2 (3% wt.) and harmal essence with different concentrations (5-15% vol). Physical properties, barrier properties such as water vapour permeability (WVP) and oxygen permeability (OP), mechanical properties, UV-visible spectra and antimicrobial activity of the films were measured. Results showed that by increasing the concentration of harmal essence, WAC from 1.75 to 1.96 (g/g dry film), Moisture uptake from 3.61 to 5.18% and WVP increased (P