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Kinetic Characterization and Thermal Inactivation of Peroxidase in Aqueous Extracts from Sweet Corn and Waxy Corn

文献类型： 外文期刊

作者： Liu, Fuguo 1 ; Niu, Liying 1 ; Li, Dajing 1 ; Liu, Chunquan 1 ; Jin, Bangquan 3 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Farm Prod Proc, Nanjing 210014, Peoples R China

2.Natl Agr Sci & Technol Innovat Ctr East China, Engn Res Ctr Agr Prod Proc, Nanjing 210014, Peoples R China

3.Nanjing Normal Univ, Ginling Coll, Dept Food Sci & Technol, Nanjing 210097, Jiangsu, Peoples R China

关键词： Peroxidase;Sweet corn;Waxy corn;Kinetic characterization;Thermal inactivation

期刊名称：FOOD AND BIOPROCESS TECHNOLOGY （ 影响因子：4.465； 五年影响因子：4.793 ）

ISSN： 1935-5130

年卷期： 2013 年 6 卷 10 期

页码：

收录情况： SCI

摘要： The objective of this study was to evaluate the activity, kinetic behavior, and thermal inactivation kinetics of peroxidase (POD) in aqueous extracts from two kinds of milk ripe stage corn, sweet corn and waxy corn. Optimum activities using guaiacol as the hydrogen donor were obtained for sweet corn at pH 4.8 and for waxy corn at pH 6.0. The kinetics of POD showed characteristics which were dependent upon the concentrations of guaiacol and H2O2. The guaiacol K (m) values for sweet corn POD and waxy corn POD were 11.01 and 23.01 mM, respectively, whereas the H2O2 K (m) values for sweet corn POD and waxy corn POD were 2.85 and 0.33 mM, respectively. Thermal treatment of enzymatic aqueous extracts was carried out at different time-temperature combinations in the range of 0-25 min and 60-85 A degrees C. Arrhenius plot determination and calculated thermodynamic parameters suggested that the inactivation of POD followed first-order reaction kinetics, and the activation energy (E (a)) for inactivation of sweet corn POD (114.36 kJ/mol) was slightly lower compared with waxy corn POD (119.72 kJ/mol). There were several notable similarities between the inactivation kinetics in the two corn cultivars.

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