extrapolated and activation energy calculated. Four major degradation products were identified. Only one of these degradation products, the uridine analogue of gemcitabine, was a known degradation product of gemcitabine and was identified by comparison with synthesized material. The other three degradation products were isolated and characterized by spectroscopic techniques. Two of these products were determined
研究了
盐酸吉西他滨(2'-脱氧-2',2'-二
氟胞苷)在pH 3.2的
水溶液中的降解动力学。
吉西他滨的降解遵循伪一级动力学,并且在四个不同温度下确定了速率常数。这些速率用于构建Arrhenius图,从中推断出较低温度下的降解速率并计算活化能。确定了四种主要降解产物。这些降解产物中只有一种,
吉西他滨的
尿苷类似物,是
吉西他滨的一种已知降解产物,通过与合成材料的比较鉴定。分离了其他三种降解产物,并通过光谱技术对其进行了表征。这些产品中有两个被确定为非对映异构体6-羟基-5,6-二氢-2'-脱氧-2',2'-二
氟尿苷,另一种产物被确定为O(6),5'-环-5,6-二氢-2'-脱氧-2',2 '-二
氟尿苷。讨论了这些降解产物的形成机理。