期刊
JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
卷 29, 期 5, 页码 843-850出版社
ELSEVIER
DOI: 10.1016/S0731-7085(02)00211-X
关键词
capillary electrophoresis; p-aminophenol; acetaminophen; hydrolysis; rate constant; activation energy
A method based on capillary electrophoresis with electrochemical detection (CE-ED) was developed for the simultaneous determination of p-aminophenol and acetaminophen in the hydrolysates of acetaminophen. Effects of several important factors such as the acidity and concentration of running buffer, separation voltage, injection time, and working potential were investigated to acquire the optimum conditions. The detection electrode was a 300 mum carbon disc electrode at a working potential of + 0.80 V (versus SCE). The two analytes can be well separated within 6 min in a 50 cm length fused silica capillary at a separation voltage of 18 kV in a 25 mM phosphate buffer (pH 6.5). The rate constants of acetaminophen hydrolysis in 0.5 M HCl at different temperatures were determined by monitoring the concentration changes of acetaminophen. At 70, 80, 90 and 100 degreesC, the measured rate constants of acetaminophen hydrolysis were 5.027 x 10 (-3), 8.522 x 10 (-3), 18.60 x 10 (-3) and 32.76 x 10 (-1) min(-1), respectively. The activation energy for acetaminophen hydrolysis was calculated to be 68.13 kJ mol (-1), which is in good agreement with the value in the literature. (C) 2002 Elsevier Science B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据