Effects of reaction parameters on self-degradation of L-ascorbic acid and self-degradation kinetics
Effects of reaction parameters on self-degradation of L-ascorbic acid and self-degradation kinetics
复制标题
反应参数对L-抗坏血酸自降解的影响及自降解动力学
DOI：
10.1007/s10068-016-0014-x
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发表时间：
2016-02-01
影响因子：
2.9
通讯作者：
Wang, Kui
中科院分区：
文献类型：
--
作者：
Li, Ya;Yang, Yan;Wang, Kui
研究了L-抗坏血酸（ASA）在不同温度、时间和pH参数下的降解行为。较高的温度和较长的时间加速了 ASA 的降解。降解产物分布随pH值的不同而变化。由于溶液 pH 值为 4.5，有利于形成无色中间产物，在 294 nm 处具有最大吸光度。 pH 值从 5.8 到 6.8 时，促进棕色产物的形成，最大吸光度为 420 nm。不同pH条件下，挥发性产物的形成不同。由于pH的影响，糠醛和呋喃衍生物是主要产物。 ASA 的非酶自降解行为具有基于经典动力学模型的一级动力学特征。不同pH值下的活化能值不同。提出了 ASA 降解机制和途径。
The degradation behavior of L-ascorbic acid (ASA) was investigated under different parameters of temperature, time, and pH. Higher temperatures and longer times accelerated the ASA degradation. Degradation product distributions changed with different pH values. As solution pH of 4.5 was beneficial for formation of uncolored intermediate products with an absorbance maximum at 294 nm. Formation of brown products was promoted at pH values from 5.8 to 6.8 with an absorbance maximum at 420 nm. Under different pH conditions, volatile products formation varied. Furfural and derivatives of furan were primary products due to the effects of pH. The non-enzymatic selfdegradation behavior of ASA was characteristic of first-order kinetics based on a classic dynamic model. Activation energy values varied under different pH values. An ASA degradation mechanism and pathway are proposed.