present, to the C-11 ketone. Minor degradation products derived from other changes affecting the side chain are also identified in several corticosteroids. These compounds are frequently associated in corticosteroids as process impurities or degradation compounds. No new radiolytic compounds unique to 60Co-irradiation have been found. The majority of corticosteroids have been shown to be stable to 60Co-irradiation
已在以下皮质类
固醇中鉴定出60
钴的放射降解产物:
可的松,
醋酸可的松,
氢化可的松,
醋酸氢化可的松,
氢化可的松琥珀酸钠,
乙酸异
氟泼酮,
甲基强的松龙,
乙酸甲基泼尼松龙,
泼尼松龙,
醋酸泼尼松龙和
泼尼松。已经确定了两种主要的降解过程:损失D环上的皮质类
固醇侧链以产生C-17酮,以及将C-11醇(如果存在)转化为C-11酮。在几种皮质类
固醇中还发现了由影响侧链的其他变化产生的较小降解产物。这些化合物通常作为加工杂质或降解化合物与皮质类
固醇结合。尚未发现60Co辐射特有的新的辐射分解化合物。已显示大多数皮质类
固醇对60Co辐射稳定。放射降解的速率为0.2-1.4%/ Mrad。