Kinetic model for autoxidation of β-carotene in organic solutions
Kinetic model for autoxidation of β-carotene in organic solutions
复制标题
有机溶液中β-胡萝卜素自氧化的动力学模型
DOI：
10.1007/s11746-999-0104-5
复制
发表时间：
1999
期刊：
影响因子：
--
通讯作者：
T. Yonemoto
中科院分区：
文献类型：
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作者：
A. Takahashi;N. Shibasaki;T. Yonemoto
以β-胡萝卜素为原料，正癸烷为溶剂，在不同的温度和溶解氧浓度条件下，对β-胡萝卜素的自氧化反应进行了实验研究。根据自催化自由基链式反应机理，提出了一个新的动力学模型。模型考虑了过氧化氢分解引起的二次引发反应以及β-胡萝卜素衍生的C中心自由基在增长和终止过程中的反应。有四个未知的动力学常数，和常数估计通过拟合模型与实验数据。拟合结果与实验数据吻合良好，在所有阶段的自氧化动力学和在很宽的氧浓度范围。该模型不仅描述了诱导阶段的出现，而且还描述了氧浓度对自氧化速率的影响。此外，该模型预测的行为，在另一种溶剂中，在低温下的自氧化，已被其他研究人员报告。
Autoxidation of β-carotene was studied experimentally using n-decane as a solvent under various reaction conditions of temperature and dissolved oxygen concentration A novel kinetic model was proposed on the basis of an autocatalytic free-radical chain reaction mechanism. A secondary initiation reaction by decomposition of hydroperoxide and reactions concerned with a β-carotene-derived C-centered radical in propagation and termination processes were taken into consideration in the model. There were four unknown kinetic constants, and the constants were estimated by fitting the model with the experimental data. The fitted results are in good agreement with the experimental data in all stages of the kinetics of autoxidation and over a wide range of oxygen concentrations. The model described not only the appearance of the induction stage but also the effect of the oxygen concentration on the autoxidation rate. In addition, the model predicted the behavior of autoxidation in another solvent at low temperature that had been reported by other researchers.