Feng Liang, Yang Yan, Xie Ya-Ting, Liu Shuang-Shuang, Peng Xuan, Hu Sheng, Yu Ai-Nong
School of Chemistry and Environmental Engineering, Hubei Minzu University, Enshi City, Hubei, China.
Key Laboratory of Biologic Resources Protection and Utilization of Hubei Province, Enshi City, Hubei, China.
Front Nutr. 2023 Jan 12;9:1022254. doi: 10.3389/fnut.2022.1022254. eCollection 2022.
The effect of reaction conditions, which comprised the reaction temperature (150-190°C), processing time (0.50, 0.75, 1.00, 1.25, 1.50, 2.00, and 2.50 h), pH (5.0, 7.0, and 9.5), and concentration (0.03-0.07 mol/L) of -ascorbic acid (ASA), on the degradation of ASA was investigated in hot-compressed water (HCW). The degradation kinetics of ASA and generation kinetics of browning products (BPs) were studied. The results showed that ASA degradation conformed to the pseudo-first-order kinetics, and the formation of BPs was closely related to the concentration of HO in HCW. The acidic condition (pH = 5.0) and lower concentration of ASA (0.03 mol/L) were more favorable for ASA degradation. In HCW, the average apparent activation energy () of ASA was 15.77, 31.70, and 47.53 kJ/mol at pH 5.0, 7.0, and 9.5, respectively. The possible degradation mechanisms of ASA and the generation of BPs in HCW were proposed based on the experimental results.
研究了反应条件（包括反应温度（150 - 190°C）、处理时间（0.50、0.75、1.00、1.25、1.50、2.00和2.50 h）、pH值（5.0、7.0和9.5）以及抗坏血酸（ASA）的浓度（0.03 - 0.07 mol/L））对热压水（HCW）中ASA降解的影响。研究了ASA的降解动力学和褐变产物（BPs）的生成动力学。结果表明，ASA降解符合准一级动力学，BPs的形成与HCW中HO的浓度密切相关。酸性条件（pH = 5.0）和较低的ASA浓度（0.03 mol/L）更有利于ASA降解。在HCW中，pH值为5.0、7.0和9.5时，ASA的平均表观活化能（）分别为15.77、31.70和47.53 kJ/mol。基于实验结果，提出了HCW中ASA可能的降解机制和BPs的生成机制。
