Effects of span-80 on the properties of konjac glucomannan-zein blend films

In order to improve film-forming compatibility of konjac glucanmannan( KGM) and zein,the impact of surfactant span-80 addition on properties of KGM-zein blend films was investigated.The results indicated that with proper addition of span-80,the compatibility of KGM and zein was improved,the films exhibited as more smooth and compact,and the thermal stability,hydrophobicity,mechanical property and oxygen resistance of the films were enhanced,and water vapor transmittance were reduced.With optimum span-80 addition( 2.5%,w / w),tensile strength( 63.02 ± 0.67) MPa and elongation at break( 15.97% ± 0.16%) of blend film were the largest,which was increased by 25.5% and 24.3%( p < 0.05).At the same time,water vapor permeability was reduced by 52.3%,and oxygen resistance performance was the best.This research may provide valuable ideas for the application of KGM-zein blend films on food packaging.