高效毛细管电泳测定血管紧张素转化酶抑制剂captopril的活性

目的建立高效毛细管电泳测定血管紧张素转化酶抑制剂captopril抑制活性的方法。方法用紫外分光光度计确定了马尿酸的特征吸收波长为228 nm。高效毛细管电泳的条件：熔融石英毛细柱，电泳缓冲液为pH 8.3的50 mmol·L^-1磷酸缓冲液，进样压力4.8 kPa，进样时间3 s，分离电压20 kV，检测波长228 nm。结果在7 min内使反应物和生成物完全分离，标定了captopril的IC₅₀值为0.019　μmol·L^-1，经过酶反应动力学判断captopril为竞争性抑制剂。结论该方法准确、简便、快速，可用于captopril抑制活性的分析。

Determination of the inhibitory activity of angiotensin-converting enzyme inhibitor captopril by high performance capillary electrophoresis

AIM: To establish a method for determinate of the inhibitory activity of angiotensin-converting enzyme inhibitor captopril by high performance capillary electrophoresis. METHODS: The characteristic absorptive wavelength of hippuric acid determined by ultraviolet spectrophotometer is 228 nm. The method employed a melted capillary column, 50 mmol.L-1 phosphoric acid (pH 8.3) buffer solution, inject pressure 4.8 kPa, inject time 3 s, separation voltage 20 kV and detection wavelength 228 nm. RESULTS: The reactant and resultant was separated completed within 7 min. IC50 of captopril was 0.019 mumol.L-1. Captopril is a competitive inhibitor, which was proved by enzyme reaction dynamics. CONCLUSION: The method was shown to be accurate, simple and rapid and can be used for determination of the inhibitory activity of captopril.