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中国临床药理学与治疗学 ›› 2005, Vol. 10 ›› Issue (7): 768-771.

• 研究原著 • 上一篇    下一篇

HPLC直接进样测定咖啡因代谢物评价三种药物代谢酶活性

李军, 彭向前1, 张鉴, 郭瑞臣2   

  1. 山东省立医院临床药理中心, 济南250021, 山东;1山东大学药学院;2齐鲁医院药物监测中心, 济南250012, 山东
  • 收稿日期:2005-05-12 修回日期:2005-06-22 出版日期:2005-07-26 发布日期:2020-11-10
  • 通讯作者: 李军, 男, 硕士, 副主任药师, 主要从事临床药理学研究。Tel:0531-85186488 E-mail: sphlijun@163.com
  • 作者简介:郭瑞臣, 男, 教授, 博士生导师, 主要从事临床药理学研究。Tel:0531-82169636 E-mail: guorc@163.net
  • 基金资助:
    山东省自然科学基金(NOQ99C05); 山东省卫生厅科研项目(NO1998CA1DBB5)

Determination of five metabolites of caffeine in urine to assess three drugmetabolying biotransformation enzyme activities by HPLC with direct injection method

LI Jun, PENG Xiang-qian1, ZHANG Jian, GUO Rui-chan2   

  1. Center of Clinical Pharmacology, Shandong Provincial Hospital, Jinan 250021, Shandong, China; 1School of Pharmaceutical Sciences, Shandong University, Jinan 250012, Shandong, China; 2Department of Clinical Pharmacology, Qilu Hospitol, Shandong Universyty, Jian 250012, China
  • Received:2005-05-12 Revised:2005-06-22 Online:2005-07-26 Published:2020-11-10

摘要: 目的: 建立测定尿中咖啡因的5 种主要代谢物:5-乙酰氨基-6-甲酰氨基-3-甲基尿酸(AFMU) 、1-甲基尿酸(1U) 、1-甲基黄嘌呤(1X) 、1, 7-二甲基尿酸(17U) 和1, 7-二甲基黄嘌呤(17X) 的高效液相色谱法, 以评价N -乙酰基转移酶(NAT2) 、细胞色素P450酶1A2(CYP1A2) 和黄嘌呤氧化酶(XO) 三种药物代谢酶的活性。方法: 采用反相高效液相梯度洗脱法直接进样测定尿液内咖啡因代谢产物AFMU 、1U 、1X 、17U 和17X 的相对含量, 计算AFMU /(AFMU +1X +1U) 、(AFMU +1X +1U) /17U 和1U /(1X +1U), 绘制概率分布直方图, 分别反映NAT2 、CYP1A2 和XO 的活性。结果: NAT2 活性呈两态分布, 快、慢乙酰化代谢表型的临界点为0.26, CYP1A2 和XO 酶活性呈近似正态分布。结论: 本方法简便、准确、快速,适合于尿中咖啡因代谢物的测定及NAT2 、CYP1A2和XO 等药物代谢酶活性的研究。

关键词: 咖啡因代谢物, 高效液相色谱法, N -乙酰基转移酶, 细胞色素P450 酶1A2, 黄嘌呤氧化酶

Abstract: AIM: To establish a HPLC method with direct injection for determining five major metabolites of caffeine including 5-acetylamino-6-formylamino-3-methyluracil (AFMU), 1-methylxanthine (1X), 1-methyluric acid (1U), 1, 7-dimethyluricacid (17U) and 1, 7-dimethylxanthine (17X) in the urine and assess the activities of N -acetyltransferase (NAT2), cytochrome P4501A2 (CYP1A2) and xanthine oxidase (XO). METHODS: The contents of five major metabolites of caffeine in the urine were determined by RP-HPLC method. Frequency distribution histogram were drawn by calculating the AFMU /(AFMU +1X +1U), (AFMU +1X +1U) /17U and 1U /(1X +1U) and then evaluated the activity of NAT2, CYP1A2 and XO, respectively. RESULTS: The frequency distribution histograms of NAT2 indicated two distinct distibution, and the subjects were classified as slow acetylators if PAR<0.26 or as fast if PAR >0.26.The frequency distribution of CYP1A2 and XO histograms indicated normal distribution. CONCLUSION: The method is simple, accurate, rapid, and suitable for the determination of metabolites of caffeine in urine. The method can be used to assay the activities of NAT2, CYP1A2 and XO.

Key words: caffeine metabolites, HPLC, N- acetyltransferase, cytochrome P4501A2, xanthine oxidase

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