H＋对水溶液中脱氧胆酸钠聚集体的影响

运用pH滴定、傅立叶变换红外光谱、紫外可见光谱、激光光散射谱、ICP和元素分析等方法研究了H＋的加入对水溶液中脱氧胆酸钠（NaDC）聚集体的影响.结果表明,浓度大于cmc的NaDC水溶液具有一定的缓冲能力,NaDC浓度越高,缓冲能力越大;随溶液中H＋浓度的增加,首先形成质子化胶团,质子化胶团通过酸盐结构的氢键作用使NaDC初级胶团长大,形成较大的高级胶团,甚至形成凝胶体,最终形成HnNam(DC)n＋m沉淀.

Influence of H + on the Aggregation Properties of Sodium Deoxycholate Aqueous Solution

The pH of bile is 6～8 in human gallbladder. The changes in pH will probably effect bile composition, which is important for gallstone formation. But little attention has been given to the influence of H＋ on bile salts aggregates in aqueous solution. Our work focused on the changes of NaDC aggregates with adding H＋ by using pH titration, FT-IR, UV-Vis and QELS (quasi-elastic light-scattering spectrometer) spectroscopies. The following conclusions are given: (1) With addition of H＋ into NaDC aqueous solution above the cmc, The aggregation of NaDC micellar changes gradually into protonated micellar aggregates, secondary or mixed aggregates, and eventually gel-like precipitates.(2) The strong H-bond with the acid salt mode induces protonated micellar aggregation to connect with primary micelles of NaDC. (3) Therefore, aqueous micellar NaDC has a buffering capacity and can increase the solubility of HDC.