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茶叶科学 ›› 2013, Vol. 33 ›› Issue (4): 322-326.doi: 10.13305/j.cnki.jts.2013.04.005

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低pH沉淀法检测茶叶中的结合咖啡碱

宋爽1,2,3, 黄业伟1,2,3, 王宣军2,3, 于海双2,3, 方崇业2,3, 盛军2,3, *, 郝淑美4,*   

  1. 1. 吉林大学生命科学学院,吉林 长春 130012;
    2. 云南农业大学普洱茶学教育部重点实验室,云南 昆明 650201;
    3. 云南省茶深加工工程技术研究中心,云南 昆明 650201;
    4. 云南大学,云南 昆明 650091
  • 收稿日期:2012-12-21 修回日期:2013-03-07 出版日期:2013-08-30 发布日期:2019-09-04
  • 通讯作者: *shengj@ynau.edu.cn
  • 作者简介:宋爽(1982— ),男,吉林通化人。主要从事茶叶生化和功效机理研究。
  • 基金资助:
    云南省科技创新强省计划(2009AB021)、云南省自然科学基金面上项目(2012FB151)

Determination of Conjugated Caffeine in Tea by Low-pH Precipitation Method

SONG Shuang1,2,3, HUANG Ye-wei1,2,3, WANG Xuan-jun2,3, YU Hai-shuang2,3, FANG Chong-ye2,3, SHENG Jun2,3,*, HAO Shu-mei4,*   

  1. 1. College of Life Science, Jilin University, Changchun 130012, China;
    2. Key Laboratory of Pu-erh Tea Science, Ministry of Education, Yunnan Agricultural University, Kunming 650201, China;
    3. Tea research Center of Yunnan, Kunming 650201, China;
    4. Yunnan University, Kunming 650091, China
  • Received:2012-12-21 Revised:2013-03-07 Online:2013-08-30 Published:2019-09-04

摘要: 探讨了低pH沉淀法检测茶叶中结合咖啡碱的可行性和优势,旨在为更精确地定量茶叶中的咖啡碱提供理论参考。研究以绿茶水提物、红茶水提物和普洱茶(熟茶)水提物为材料,应用低pH沉淀法检测了试样中的结合咖啡碱含量,并结合氯仿萃取法对检测结果进行了验证。结果表明,低pH沉淀法能够准确、简便地检测茶叶中的结合咖啡碱,其中普洱茶(熟茶)水提物中的结合咖啡碱含量最高(含2.59%),而绿茶和红茶水提物中只有极少量的咖啡碱为结合态(含量分别为0.04%和0.07%)。

关键词: 低pH沉淀法, 茶, 结合咖啡碱

Abstract: The feasibility and superiority in the determination of conjugated caffeine in tea by the method of low-pH precipitation was investigated in order to provide some theories for the determination of caffeine content in tea accurately. The aqueous extract of green tea, black tea and fermented Pu-erh tea were selected as test samples. The content of conjugated caffeine of the tea samples was determined by the method of low-pH precipitation. Meanwhile, the results of conjugated caffeine content were verified by the method of chloroform-extraction. The results showed as follows: Low-pH precipitation method is suitable for the determination of conjugated caffeine in tea. The content of conjugated caffeine in fermented Pu-erh tea is the highest (2.59%) among the three tea samples. However, the contents of conjugated caffeine in the green tea and black tea were relatively low (0.04% and 0.07% respectively).

Key words: low-pH precipitation, tea, conjugate-caffeine

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