Abstract
The effects of three cyclodextrins (α-, β-, γ-CyD) on the acid hydrolysis of digoxin were examined. From the high performance liquid chromatographic tracing of each of the four components (digoxin, bisdigitoxoside, monodigitoxoside, digoxigenin) in reaction mixtures, the individual rate constants (k1-k6) were determined by analogue computer simulation. The hydrolysis was suppressed by CyDs in the order of β->γ->α-CyD, where β-CyD inhibited the appearance rates of digoxigenin (k3, k5, and k6) significantly. In the dissolution study of digoxin tablets, the increase in dissolution rate and decrease in acid hydrolysis were attained by inclusion complexation. The data are presented suggesting that CyDs are useful for improving the oral bioavailability of digoxin.
标题:摘要
研究了三种
环糊精(α-,β-,γ-CyD)对洋地黄酸
水解的影响。通过对反应混合物中四种成分(洋地黄,双洋
地黄苷,单洋
地黄苷,洋地黄素)的每个成分的高效
液相色谱追踪,通过模拟计算机模拟确定了各自的速率常数(k1-k6)。
水解被CyDs抑制的顺序为β->γ->α-CyD,其中β-CyD显著抑制了洋地黄素的出现速率(k3,k5和k6)。在洋地黄片剂的溶解研究中,通过包合络合增加了溶解速率并减少了酸
水解。数据显示,CyDs对于提高洋地黄的口服
生物利用度是有用的。