Simultaneous Determination of Various Organic Acids in Compressed Tea by High Performance Liquid Chromatography
DING
Ling, TU Youying, CHEN Xiaoming
(Department
of tea science, Zhejiang University, Hangzhou 310029, China)
Abstract The determination of ten organic acids in compressed tea by using high performance liquid chromatography was investigated. Organic acids were analysed by using a Shimadzu LC-2010 HPLC equipped with a UV detector and a Diamonsil C18 column,15-μl sample was injected into the column. The detection was performed by measuring absorbance at 210 nm and column temperature at 30°C. The flow rate was set at 0.6 ml/min and mobile phase was 0.1mol/L KH2PO4 (pH value was adjusted to 2.8 by phosphoric acid). The recoveries of the spiked organic acids and the relative standard deviations of the organic acids were 92.5% ~ 101.3%, and 0.62%~2.73%, respectively. All of the correlation coefficients between the concentration of the organic acids and the HPLC response areas were higher than 0.94, indicating that the method was simple, rapid and accurate.
Key
words High performance liquid
chromatography; determination ;organic acid; compressed tea
高效液相色谱测定紧压茶中有机酸条件研究
丁玲 屠幼英 陈晓敏
(浙江大学茶学系 杭州 310029)
摘要 建立了一种利用高效液相色谱测定紧压茶中10种有机酸的方法。紧压茶中有机酸的色谱条件为:Diam onsil C18柱(5μ ,250×4.6mm),柱温30℃,流速0.6 ml/min,检测波长210nm,进样量 15μl,流动相 0.1 mol/L KH2PO4(用磷酸调至pH 2.8)。该方法有机酸添加回收率达到92.5%~101.3% ,相对标准差0.62%~2.73% ,各种有机酸浓度与HPLC峰面积的线性相关系数大于0.94,表明该测定方法快速简便,具有较高的准确度和精确度。
关键词 高效液相色谱; 测定;有机酸; 紧压茶
中图分类号:0652.63;TS272.5+4;0623.61 文献标识码:A 文章编号:0577-8921(2005)04-224-04
收稿日期:2005-08-12 修改稿收稿日期:2005-09-04
作者简介:丁玲, 女(1983年-),湖北宜昌人,浙江大学茶学系研究生,从事茶叶生物化学与综合利用研究工作。
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