Soluble soybean polysaccharide: A new carbohydrate to make a biodegradable film for sustainable green packaging

•The feasibility of making soluble soybean polysaccharide (SSPS) film was examined.•It was found that glycerol concentration significantly affected WVP of the films.•Glycerol concentration caused the b and L values increased while ΔE value decreased.•The results obtained indicated that SSPS could be a promising packaging material. Biodegradable edible films based on soluble soybean polysaccharide (SSPS), a new film-forming material, and three levels of glycerol (20%, 30% and 40%, w/w) as plasticizer, were developed and evaluated in terms of physical, mechanical, barrier and optical properties as well as their microstructure. SSPS-based films with a concentration of 20% glycerol possessed the lowest water vapor permeability. Increasing the glycerol content increased (P