Citation: Zhang Li, Yang Zhan-Lan, Xiong Yao, Peng Teng-Teng, Weng Shi-Fu, Wu Jin-Guang. Influence of H+ on the Aggregation Properties of Sodium Deoxycholate Aqueous Solution[J]. Acta Physico-Chimica Sinica, ;2004, 20(10): 1196-1199. doi: 10.3866/PKU.WHXB20041006
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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.
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