Zn^(2+)沉淀法提取茶多酚工艺研究  

Study on Extraction Technological of Tea-polyphenols by Using Zn ^( 2+) as Sedimentation Agent

作　　者：杨晓萍[1] 钟梅[2] 周帅祥[2] 毛丹青[2] 

机构地区：[1]华中农业大学园艺林学学院,武汉430070 [2]华中农业大学茶学专业,武汉430070

出　　处：《食品与发酵工业》2006年第4期122-125,共4页Food and Fermentation Industries

基　　金：湖北省自然科学基金资助项目(No.2004ABA136)

摘　　要：对Zn2+沉淀法提取茶多酚的工艺条件进行了研究。结果表明,影响Zn2+沉淀茶多酚的因素主要依次为,pH值、ZnSO4用量、沉淀时间;影响茶多酚Zn2+络合物转溶效果的因素依次为,转溶时间、料酸比、HCl浓度。茶多酚沉淀的最佳工艺条件为:溶液pH值7.0,按m(茶多酚)∶m(ZnSO4)=1∶3的比例加入ZnSO4,沉淀20min;茶多酚Zn2+络合物最佳转溶条件为:按1g∶4mL料酸比加入4mol/LHCl,转溶15min,在此工艺条件下,茶多酚得率为23.04%,纯度达90%。The results showed that pH had the most significant effect on TP sediment,next was the content of ZnSO4 and timing. Timing, the ratio between TP-Zn^2 ＋ and acid,and the concentration of HCl all had effect on the aspect of dissolving TP-Zn^2＋ . The optimum extraction was. pH 7.0,TP：ZnSO4 = 1：3 in 20 min, the conditions for the best dissolving were： 4 mol/L HCl at 1：4 ratio with TP-Zn^2＋ for 15 min. The yield and the purity of TP could reach to 23.04 % and 90% respectivity.

关 键 词：茶多酚 ZN^2+ 沉淀法 

分 类 号：TQ28[化学工程—有机化工]