A systematic study on the chemical stability of mitomycin A and mitomycin B.
作者:Jos H. BEIJNEN、OEDS A.G.J. VAN DER HOUWEN、HILDE ROSING、WILLY J.M. UNDERBERG
DOI:10.1248/cpb.34.2900
日期:——
The kinetics and mechanisms of the degradation of mitomycin A and mitomycin B in aqueous solution were investigated by means of ultraviolet (UV) spectrophotometry and high-performance liquid chromatography (HPLC). The influences of pH, buffers and temperature on the degradation were quantified. Degradation products were isolated and characterized by mass spectrometry (MS), UV-VIS spectrophotometry, chromatography and circular dirchroism (CD) spetroscopy. The degradation reactions follow (pseudo) first-order kinetics. The collected kinetic data allowed an accurate determination of the pKa value of the aziridine moiety of the mitomycins by using computerized curve-fitting models.
通过紫外(UV)分光光度法和高性能液相色谱(HPLC)研究了丝裂霉素A和丝裂霉素B在水溶液中的降解动力学和机理。定量分析了pH值、缓冲液和温度对降解的影响。通过质谱(MS)、紫外-可见分光光度法、色谱法和圆二色谱(CD)光谱法分离和鉴定了降解产物。降解反应遵循(准)一级动力学。收集的动力学数据通过计算机化曲线拟合模型准确测定了丝裂霉素中氮丙啶部分的pKa值。