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茶叶科学 ›› 2006, Vol. 26 ›› Issue (1): 37-41.doi: 10.13305/j.cnki.jts.2006.01.006

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膜技术富集儿茶素渣中茶氨酸效应研究

萧力争1,肖文军1,2,龚志华1,王伟2,刘仲华1,2*   

  1. 1.湖南农业大学食品科学技术学院, 湖南长沙 410128;
    2.湖南农业大学天然产物研究中心, 湖南长沙 410128
  • 收稿日期:2005-08-18 修回日期:2005-12-20 出版日期:2006-03-25 发布日期:2019-09-10
  • 通讯作者: *刘仲华
  • 作者简介:萧力争(1963— ),男,湖南湘谭人,副教授,主要从事茶叶加工及茶叶品质化学的研究与教学。
  • 基金资助:
    基金课题:国家计委十五高新技术产业化重大专项—“植物功能成分提取高技术产业化示范工程”(计高技[2002]2284号

Study on Separation and Concentration of Theanine in De-catechined Tea Extracts by Membrane System

XIAO Li-zheng1, XIAO Wen-jun1, 2, GONG Zhi-hua1, WANG Wei2, LIU Zhong-hua1, 2, *   

  1. 1. College of Food Science and Technology , Chang sha 410128, China;
    2. Natural Products Institute of Hunan Agricultural University, Changsha 410128, China
  • Received:2005-08-18 Revised:2005-12-20 Online:2006-03-25 Published:2019-09-10

摘要: 以茶叶深加工中提制儿茶素后的废料 — 儿茶素渣为材料,在筛选出膜分离与富集茶氨酸最适料液pH值的基础上,比较研究了截留分子量为2500βDa、3500βDa、5000βDa的膜超滤儿茶素渣料液对茶氨酸得率与纯度的影响,以及300βDa纳滤、200βDa纳滤、反渗透、真空蒸发浓缩四种浓缩方法对茶氨酸的效应。结果表明:调节料液体系的pH值至2.8~3.5左右,有利于在超滤过程中分离与富集茶氨酸; 选用截留分子量为3500βDa膜超滤儿茶素渣料液,茶多酚、水溶性碳水化合物等大分子物质大部分被截留,其截留率分别为89.90%、92.20%,可获得率为54.50%、纯度为8.92%的茶氨酸料液,300βDa纳滤、200βDa纳滤、反渗透、真空蒸发浓缩四种浓缩方法在加工茶氨酸中,茶氨酸损失率依次为4.51%、3.62%、0.45%、5.15%。综合考虑,利用3500βDa超滤分离与反渗透浓缩可以分离与富集儿茶素渣中的茶氨酸,综合得率与纯度分别为54.05%和8.53%,在生产上具有一定的可行性。;

关键词: 茶叶深加工, 茶氨酸, 儿茶素渣, 膜技术, 分离, 富集

Abstract: :By using the material of de-catechined tea extracts in tea comprehensive processing and on the basis of selecting the best pH value of liquid for separation and concentration theanine by ultra-filtration,the effect on the yield rate and purity of theanine by 2500βDa、3500βDa、5000βDa ultra-filtration and four concentrating method of 300βDa nano-filtration、200βDa nano-filtration、reverse osmosis、vacuum vaporation concentration were comparatively studied in processing the de-catechined tea extracts. The results indicated that it was beneficial to separate and concentrate theanine from de-catechined tea extracts when the value of pH was 2.8~3.5.3500βDa ultrafiltration had a good effect in separating and concentrating theanine ,the major tea polyphenol ,water soluble carbohydrate were preserved and the cut rate reached 89.90%、92.20% respectively, the yield rate and purity of theanine was 54.50%,8.92% respectuvely. The lost rate of theanine in concentrating of 300βDa nano-filtration、200βDa nano-filtration、reverse osmosis、vacuum vaporation concentration was 4.51%、3.62%、0.45%、5.15% respectively. Take all thing into account, it is feasible to separate and concentrate theanine from de-catechined tea extracts in tea comprehensive processing industry by the joint application of ultra-filtration and reverse osmosis,and the yield rate and purity of theanine can reach 54.05% and 8.53% respectively.

Key words: tea comprenhensive processing, theanine, de-catechined tea extracts, membrane technology, separation, concentration

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