Utilization of Uncaria gambir Roxb filtrate in the formation of bioactive edible films based on corn starch

Abstract The objective of this research was to determine the effect of Uncaria gambir Roxb filtrate addition on functional edible films based on corn starch. This study used a Factorial Randomized Completely Design with two treatments and three replication for each treatment. The first factor was the concentration of Uncaria gambir Roxb filtrate (20%, 30%, 40%) and the second factor was the mixing separation method (filtering, centrifuge 1000 rpm, centrifuge 2000 rpm). The results showed that treatment of Uncaria gambir Roxb filtrate and the mixing separation method had significant effect on thickness, elongation percentage, water vapour transmission rate, antioxidant and antibacterial activities of edible film. The interaction of Uncaria gambir Roxb filtrate and the mixing separation method had significant effect on water vapour transmission rate. The best treatment based on edible film characteristics was 40% concentration of Uncaria gambir Roxb filtrate and the mixed separation method of 1000 rpm centrifugation.摘要 本研究旨在探究添加钩藤（Uncaria gambir Roxb）滤液对以玉米淀粉为基质的功能性可食用膜的影响。本研究采用两因素完全随机试验设计，每组设置3次重复。第一因素为钩藤滤液浓度（20%、30%、40%），第二因素为混合分离方法（过滤、1000 rpm离心、2000 rpm离心）。结果表明，钩藤滤液浓度与混合分离方法均对可食用膜的厚度、伸长率、水蒸气透过率、抗氧化活性及抗菌活性具有显著影响；二者的交互作用对可食用膜的水蒸气透过率存在显著影响。综合可食用膜各项特性来看，最优处理组合为40%浓度的钩藤滤液配合1000 rpm离心的混合分离方法。