Kinetics of Soy Lecithin Oxidation at High Concentrations: The Effect of Antioxidants

IF 1.4 4区化学 Q4 PHYSICS, ATOMIC, MOLECULAR & CHEMICAL

Russian Journal of Physical Chemistry B Pub Date : 2025-01-15 DOI:10.1134/S1990793124701185

L. I. Mazaletskaya, N. I. Sheludchenko, O. T. Kasaikina

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Abstract

The azobisisobutyronitrile (AIBN)-initiated oxidation of soy lecithin (RH) is studied in a wide range of RH (0.027−0.4 mol/L) and AIBN (0.01–0.043 mol/L) concentrations. It is found that at high concentrations of lecithin the oxidizability parameter a = k_p/(2k_t)^0.5, where k_p and k_t are the constants of the rate of chain propagation and termination, is significantly reduced, while regardless of the concentration of lecithin, a linear dependence of the initiation rate on (W_i)^0.5 is maintained. The antiradical activity of antioxidants (AOs) of different classes at [RH] = 0.4 mol/L is assessed, showing that the antiradical activity of phenols in lecithin is significantly lower than in hydrocarbons. The antiradical activity and inhibitory effects in the oxidation of lecithin decrease in the following order: α-tocopherol > 3,6-di-tert.butyl-1,2-benzoquinone > quercetin > 2,4,6-tri-tert.butylphenol.

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高浓度大豆卵磷脂氧化动力学：抗氧化剂的影响

在较宽的RH （0.027 ~ 0.4 mol/L）和AIBN （0.01 ~ 0.043 mol/L）浓度范围内，研究了偶氮二异丁腈（AIBN）对大豆卵磷脂（RH）的氧化反应。研究发现，在高浓度卵磷脂下，氧化性参数a = kp/(2kt)0.5（其中kp和kt是链扩展和终止速率的常数）显著降低，而不管卵磷脂的浓度如何，起始速率与（Wi）0.5保持线性关系。在[RH] = 0.4 mol/L时，测定了不同种类抗氧化剂的抗自由基活性，结果表明卵磷脂中酚类物质的抗自由基活性明显低于碳氢化合物。卵磷脂的抗自由基活性和氧化抑制作用依次递减：α-生育酚；3, 6-di-tert。butyl-1 2-benzoquinone比;槲皮素在2、4、6-tri-tert.butylphenol。

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来源期刊

Russian Journal of Physical Chemistry B 化学-物理：原子、分子和化学物理

CiteScore

2.20

自引率

71.40%

发文量

106

审稿时长

4-8 weeks

期刊介绍： Russian Journal of Physical Chemistry B: Focus on Physics is a journal that publishes studies in the following areas: elementary physical and chemical processes; structure of chemical compounds, reactivity, effect of external field and environment on chemical transformations; molecular dynamics and molecular organization; dynamics and kinetics of photoand radiation-induced processes; mechanism of chemical reactions in gas and condensed phases and at interfaces; chain and thermal processes of ignition, combustion and detonation in gases, two-phase and condensed systems; shock waves; new physical methods of examining chemical reactions; and biological processes in chemical physics.