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：本研究旨在明确添加甘比尔钩藤（Uncaria gambir Roxb）滤液对玉米淀粉基功能性可食用膜的影响。本研究采用完全随机析因设计，设置2个试验因素，每个处理重复3次。试验因素一为甘比尔钩藤滤液浓度，设置20%、30%、40%三个梯度；试验因素二为固液分离方式，包含过滤、1000 rpm离心、2000 rpm离心三种处理。结果显示，甘比尔钩藤滤液浓度与固液分离方式两个试验因素，对可食用膜的厚度、断裂伸长率、水蒸气透过率、抗氧化活性及抗菌活性均具有显著影响；二者的交互作用对可食用膜的水蒸气透过率具有显著影响。综合可食用膜各项特性指标，最优处理组合为甘比尔钩藤滤液浓度40%，采用1000 rpm离心的固液分离方式。