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茶叶科学 ›› 2014, Vol. 34 ›› Issue (6): 572-576.doi: 10.13305/j.cnki.jts.2014.06.018

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茶树中总有机酸的自动电位滴定仪测定方法

朱旭君1, 杨平平1,2, 徐仁扣2, 王玉花1, 黎星辉1,*   

  1. 1. 南京农业大学茶叶科学研究所,江苏 南京 210095;
    2. 中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室,江苏 南京210008
  • 收稿日期:2014-04-14 修回日期:2014-07-16 出版日期:2014-12-20 发布日期:2019-09-03
  • 通讯作者: *lxh@njau.edu.cn
  • 作者简介:朱旭君(1984— ),男,浙江浦江人,博士,讲师,主要从事茶树生理与栽培方面的研究。
  • 基金资助:
    现代农业产业技术体系建设专项资金(CARS-23)、国家自然科学基金(30872009)、苏州市科技计划(SZGD201067、WNZ1002、吴政抄2009字65号)

A Method for Determination of Total Organic Acids in Tea Plant with Automatic Potentiometic Titration

ZHU Xujun1, YANG Pingping1,2, XU Renkou2, WANG Yuhua1, LI Xinghui1,*   

  1. 1. Institute of Tea Science, Nanjing Agriculture University, Nanjing 210095, China;
    2. State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, The Chinese Academy of Sciences, Nanjing 210008, China
  • Received:2014-04-14 Revised:2014-07-16 Online:2014-12-20 Published:2019-09-03

摘要: 建立了一种应用自动电位滴定仪快速检测茶树中总有机酸的方法,并用该方法测定了茶树新芽、幼叶、成熟叶,以及凋落叶中总有机酸的含量。结果表明,样品经乙醇提取、减压浓缩,再经过先碱化后酸化处理,乙酸乙酯萃取后,用自动电位滴定仪检测茶树叶片中的总有机酸,有机酸的添加量为2.0~45.0 mg·g-1,回收率为96.0%~99.6%,相对标准偏差(RSD)≤5.7%,该方法是茶树叶片总有机酸含量测定的简单快捷方法。运用该方法,新芽、幼叶、成熟叶、凋落叶总有机酸含量的测定值分别为44.9、20.1、21.1、1.99 mg·g-1

关键词: 自动电位滴定, 茶树叶片, 总有机酸

Abstract: A method for determination of total organic acids in tea plant by automatic potentiometic titrator was established in this study. And the content of total organic acids in bud, young leaf, mature leaf and withered leaf were determined by this method. The results showed that after extracting by ethanol, concentrated under reduced pressure, the concentrated solution was alkalized and acidified, then detected with automatic potentiometic titrator, the samples were spiked at the level of 2.0-45.0 mg·g-1, and the recovery of organic acids range from 96.0%-99.6% with RSD less than 5.7%. This simple and sensitive method meets with the analytical requirement to total organic acids in tea. The content of total organic acids in bud, young leaf, mature leaf and withered leaf was 44.9, 20.1, 21.1 and 1.99 mg·g-1 respectively.

Key words: automatic potentiometic titration, tea leaves, total organic acids

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