柿叶在二甲基亚砜和二甲基乙酰胺中的动态溶解及酸碱相互作用的影响
Dynamic dissolution of persimmon leaves in DMSO and DMAc and the influence of acid-base interactions.
作者信息
Xu Yuan, Shen Qing
机构信息
Department of Polymer Material and Engineering, Donghua University, 1882 W. Yan An Road, 200051 Shanghai, China.
出版信息
Colloids Surf B Biointerfaces. 2006 Jan 15;47(1):98-101. doi: 10.1016/j.colsurfb.2005.11.027. Epub 2006 Jan 10.
Applying conductivity as a measure, dynamic behavior for dissolution of persimmon leaves in two organic solvents, e.g. DMSO and DMAc, respectively, were recorded and a mathematical model described as: dC/dt = k0 + k1C + k2C2 was deduced (of which, C is the concentration dissolved, k0, k1 and k2 are the different dissolution rate constants corresponding different dissolution stages and t is the time). Results showed that the DMAc seems to be better than that of DMSO due probably to the former having a higher activation energy and smaller acid/base ratio and polarity comparing to the latter. However, for a lower temperature, it seems to be contrary due to DMSO presented greater dissolution rate constant than that of DMAc.
以电导率为衡量指标，分别记录了柿叶在两种有机溶剂（二甲基亚砜和二甲基乙酰胺）中的溶解动态行为，并推导了一个数学模型：dC/dt = k0 + k1C + k2C2（其中，C为溶解浓度，k0、k1和k2是对应不同溶解阶段的不同溶解速率常数，t为时间）。结果表明，二甲基乙酰胺似乎比二甲基亚砜更好，这可能是因为前者具有比后者更高的活化能、更小的酸碱比和极性。然而，在较低温度下，情况似乎相反，因为二甲基亚砜的溶解速率常数比二甲基乙酰胺的更大。
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