高等学校化学学报

高等学校化学学报 ›› 1995, Vol. 16 ›› Issue (4): 536.

• 论文 • 上一篇    下一篇

原子吸收法在有机分析中的应用(Ⅲ)──茶叶中茶多酚的测定

王吉德1, 田笠卿2, 王连生2   

  1. 1. 新疆大学化学系, 乌鲁木齐, 830046;
    2. 南京大学现代分析中心
  • 收稿日期:1994-04-22 修回日期:1994-08-16 出版日期:1995-04-24 发布日期:1995-04-24
  • 通讯作者: 王吉德,男,36岁,副教授.
  • 作者简介:王吉德,男,36岁,副教授.

The Application of Atomic Absorption Spectrometry to Organic Analysis(Ⅲ)──Determination of Tannins in Tea

WANG Ji-De1, TIAN Li-Qing2, WANG Lian-Sheng2   

  1. 1. Department of Chemistry, Xinjiang University, Urumqi, 830046;
    2. Center of Modern Analysis, Nanjing University, Nanjing
  • Received:1994-04-22 Revised:1994-08-16 Online:1995-04-24 Published:1995-04-24

PDF (PC)

被引次数

56

摘要： 研究了间接测定茶叶中茶多酚的原子吸收法。用甲基异丁酮和丁醇的混合溶剂萃取茶汤中的茶多酚,与氨基酸分离后,加入碱性Cu3(PO4)2悬浮液反萃取并同茶多酚作用,离心沉降未作用的Cu3(PO4)2后,用原子吸收法测定Cu,可求得茶多酚的含量。本法可消除茶叶中共存氨基酸的干扰,测定结果同标准方法一致。回收率范围为94%～104%,平均标准偏差为3.1%.

关键词: 原子吸收法, 茶多酚, 茶叶

Abstract: In this paper,a new indirect method for determining tannins in tea by atomic absorption spectrometry is studied. Tannins in tea is extracted with mixed extractant of methyl isobutyl ketone(MIBK)and butyl alcohol and separated from the sample solution,then Cu3(PO4)2reagent is added to react with tannins in organic phase,the uncosumed reagent is centrifuged to subside, the Cu in supernatant is determined by AAS, and the concentration of tannins in tea is obtained. The interference of coexisting amino acid can be eliminated by this method,and the results of official method and ours show no difference,the recoveries are between 94%-104%,and the avarage relative standard deviation is 3.1%.

Key words: Atomic absorption spectromitry, Tannins, Tea

TrendMD: