食品科学 ›› 2011, Vol. 32 ›› Issue (18): 253-255.doi: 10.7506/spkx1002-6630-201118056

• 分析检测 • 上一篇    下一篇

电导检测离子排斥色谱法测定绿茶中的没食子酸

许 丽,周光明*,余 娜,张丽贤   

  1. 西南大学化学化工学院,发光与实时分析教育部重点实验室
  • 出版日期:2011-09-25 发布日期:2011-09-24
  • 基金资助:
    重庆市自然科学基金项目(CSTC2007BB5370);科技部重大专项(2008ZX07315)

Determination of Gallic Acid in Green Tea by Ion Exclusion Chromatography with Conductivity Detection

XU Li,ZHOU Guang-ming*,YU Na,ZHANG Li-xian   

  1. (Key Laboratory of Luminescence and Real-time Analysis, Ministry of Education, College of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China)
  • Online:2011-09-25 Published:2011-09-24

摘要: 建立离子排斥色谱法测定绿茶中没食子酸的分析方法。采用Metrosep Organic Acids(250mm×7.8mm)分离柱和电导检测器,对分离条件进行优化。结果表明:最佳的色谱条件为以0.006mmol/L H2SO4溶液为淋洗液、50.0mmol/L LiCl溶液为再生液、流速0.5mL/min;在优化的分离条件下,绿茶中常见的F-和8种酸对没食子酸的测定均无干扰,总分析时间为19min,没食子酸的检出限为0.1μg/mL;连续6次进样,峰面积相对标准偏差为1.34%,4种绿茶中没食子酸的回收率为87.1%~96.7%。该方法简单、快速,结果令人满意。

关键词: 没食子酸, 离子排斥色谱, 抑制电导检测, 绿茶

Abstract: An ion exclusion chromatographic method for the determination of gallic acid in green tea was described. The optimal chromatographic separation was investigated on Metrosep Organic Acids (250 mm×7.8 mm) column with conductivity detection. The optimal separation was achieved using 0.006 mmol/L sulfuric acid as the eluent, 50.0 mmol/L lithium chloride as the regenerated liquid at a flow rate of 0.5 mL/min. Fluoride and 8 common acids in green tea had no interference on the determination. The total analysis time was 19 minutes. The detection limit of gallic acid was 0.1 μg/mL. The RSD of peak area for six replicate determinations was 1.34%. The recovery percentages in 4 green teas were 87.1%-96.7 %. So, the method has the advantages of simplicity, rapidity and satisfying results.

Key words: gallic acid, ion-exclusion chromatography, suppressed conductivity detection, green tea

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