绿茶渣中膳食纤维提取工艺的研究

Study on the Extraction Technology of Dietary Fiber from Green-tea Residue

本文以热水浸泡过的绿茶渣为原料,采用碱性提取法制备膳食纤维。利用正交试验设计确定绿茶渣中不溶性膳食纤维的最佳提取工艺,结果表明:绿茶渣中可溶性膳食纤维含量极少,没有提取的经济价值;不溶性膳食纤维的最佳提取工艺参数为:NaOH浓度为0.4mol/L、处理时间为60min、提取温度为50℃,此时提取率为34.64%。

Dietary fiber was prepared by alkalinity extration from green-tea residue soaked in hot water. Through orthogonal experiment design, the optimun extration technology of dietary fiber was determined. The results showed that there was little soluble dietary fiber in the green-tea residue. Therefore, there was no economic value on the extraction of soluble dietary fiber from green tea residue. The optimum conditions of the extration of insoluble dietary fiber were as follow： the NaOH concentraion was 0.4 tool/L, the extraction time was 60 rain and the extraction temperature was at 50℃. Under the condition, the extraction rate of insoluble dietary fiber from green-tea residue was 34.64%.