Solvent and pH Dependences of Mixing Enthalpies of N-Glycylglycine with Protocatechuic Acid
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- 作者：Chunmei Wang ; Meiju Niu ; Min Liu ; Dezhi Sun ; Bingquan Wang ; Zhengping Wang ; Dacheng Li ; Guiqin Liu ; Jun Han
- 刊名：Journal of Chemical & Engineering Data
- 出版年：2016
- 出版时间：January 14, 2016
- 年：2016
- 卷：61
- 期：1
- 页码：487-494
- 全文大小：293K
- ISSN：1520-5134
文摘
Protocatechuic acid (PA) is a natural phenolic compound which has been proven to have chemopreventive property against chemically induced carcinogenesis. The mixing enthalpies of PA with N-glycylglycine in sodium phosphate and potassium phosphate buffer solutions with different pH values have been investigated by mixing-flow isothermal microcalorimetry at T = 298.15 K. The heterotactic enthalpic interaction coefficients (hxy) in the pH range of phosphate buffer solution from 3.0 to 8.0 have been calculated according to the McMillan–Mayer theory. Trends of the enthalpic pairwise interaction coefficients (hxy) with increasing pH in both phosphate buffer solutions were obtained. The solvent and pH dependence of the hxy were discussed in terms of molecular interactions between solvated solute molecules.