高等学校化学学报 ›› 1990, Vol. 11 ›› Issue (8): 822.

• 研究论文 • 上一篇    下一篇

空气整段间隔流动注射分析的应用——茶叶中α-氨基酸总量的测定

徐逸云, 孙小平, 武巧珍, 田笠卿   

  1. 中国药科大学分析化学教研室
  • 收稿日期:1989-02-28 出版日期:1990-08-24 发布日期:1990-08-24
  • 通讯作者: 田笠卿

The Application of FIA with Air-Bubbles Sandwich ( I ) ——The Determination of Total Amount of a-Amino Acids in Tea

Xu Yiyun, Sun Xiaoping, Wu Qiaozhen, Tian Liqing(Tian Li-ching)   

  1. Center uf Modem Chemiucal Analysis, Nanjing University, Nanjing
  • Received:1989-02-28 Online:1990-08-24 Published:1990-08-24

摘要: 用水合茚三酮以硫酸肼还原,与氨基酸反应的空气整段间隔流动注射分析法测定茶叶中α-氨基酸总量,只需90℃、5min测定下限就可达5mg/L,回收率在97~106%,进样频率80样/h。

关键词: 空气整段间隔流动注射分析, 分光光度测定, 氨基酸, 茶叶

Abstract: The method of sample sandwiched between two air bubbles in FIA was used to determine the a-amino acids in tea. The hydra ted ninhydrin solution was added as a colour reagent and N2H4SO4 as a reductant. The use of N2H4SO4 instead of SnCl2 can accelerate the colour reaction and a higher sensitivity can be obtained. The detection limit can drop to 5 mg/La-amino acid. The reaction was carried out at 90 ℃ and the reaction time is reduced to 5 min. A small amount of TritonX-100 surfactant is used to keep the solution from depositing,thus a better reproducibility and a stable baseline can be obtained. In the measurement,the sampling frequency is 80 samples/h,the standard recovery is 97~106%, the related coefficient is about 0. 999 and the average relative standard deviation RSD is 2.8%.

Key words: Air-Bubbles Sandwich FIA, Spectrophotometry, Amino acids, Tea

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