王齐放 李三鸣 车鑫 李超杰. 采用变温法研究直链淀粉/水杨酸包合物脱包反应动力学J. 药学学报, 2010,45(7): 909-913.
引用本文: 王齐放 李三鸣 车鑫 李超杰. 采用变温法研究直链淀粉/水杨酸包合物脱包反应动力学J. 药学学报, 2010,45(7): 909-913.
WANG Ji-Fang, LI San-Ming, CHE Xin, LI Chao-Jie. Kinetic study on dissociation of amylose/salicylic acid compound using non-isothermal methodJ. 药学学报, 2010,45(7): 909-913.
Citation: WANG Ji-Fang, LI San-Ming, CHE Xin, LI Chao-Jie. Kinetic study on dissociation of amylose/salicylic acid compound using non-isothermal methodJ. 药学学报, 2010,45(7): 909-913.

采用变温法研究直链淀粉/水杨酸包合物脱包反应动力学

Kinetic study on dissociation of amylose/salicylic acid compound using non-isothermal method

  • 摘要:

    采用密封控温技术制备直链淀粉/水杨酸包合物, 通过红外光谱及粉末X-射线衍射验证包合物的形成。从脱包率与时间的关系入手, 采用变温法, 结合非线性最小二乘法解析脱包反应的动力学参数。红外光谱及粉末X-射线衍射验证了直链淀粉/水杨酸包合物的形成, 水杨酸以分子状态存在于直链淀粉的螺旋结构中形成了分子包合物。脱包反应为一级反应。当升温速率为510 ·h−1, 采用变温法求得脱包反应的活化能 (Ea) 分别为21.7122.41 kJ·mol−1, 频率因子 (lnA) 分别为9.3210.08; 而恒温法中脱包反应的Ea22.17 kJ·mol−1, lnA9.26。表明两种方法求得的动力学参数EalnA具有一致性。本文所采用的变温法能够快速准确地确定脱包反应的动力学参数, 可用于包合物稳定性的研究。

     

    Abstract:

    The inclusion compound of amylose and salicylic acid (SA) was prepared by a sealed temperature control method, and the formation of the inclusion compound was confirmed by IR spectrum and powder X-ray diffraction.  The kinetic parameters of dissociation of amylose/SA compound were studied by the non-         isothermal method which was defined as a relationship between the dissociation ratio and time.  The values of activation energy (Ea) and frequency factors (lnA) were calculated by a nonlinear least-square method.  In this study, the formation of the inclusion compound of amylose / SA was confirmed by IR spectrum powder X-ray diffraction.  SA existed in a molecule form in the spiral stouction of amylose.  The dissociation of amylose/SA compound was attributed to first order reaction.  The values of Ea calculated by the nor-isothermal method were 21.71 and 22.41 kJ·mol−1 at heating rate 5 and 10 ·h−1, respectively.  The corresponding isothermal method value of Ea was 22.17 kJ·mol−1; the calculated lnA values were 9.32 and 10.08 at heating rate 5 and 10 ·h−1,  respectively.  The corresponding isothermal method lnA value was 9.26.  The results were in good agreement with Ea values and lnA values by isothermal method.  These results indicated that the non-isothermal method described in this study could be adequately used for the stability study of inclusion compound and was a rapid and accurate method for the determination of kinetic parameters.

     

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