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Kinetics of hydrogen peroxide decomposition by catalase: hydroxylic solvent effects

机译:过氧化氢酶分解过氧化氢的动力学:羟基溶剂作用

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摘要

The effect of water-alcohol (methanol, ethanol, propan-1-ol, propan-2-ol, ethane-1,2-diol and propane-1,2,3-triol) binary mixtures on the kinetics of hydrogen peroxide decomposition in the presence of bovine liver catalase is investigated. In all solvents, the activity of catalase is smaller than in water. The results are discussed on the basis of a simple kinetic model. The kinetic constants for product formation through enzyme-substrate complex decomposition and for inactivation of catalase are estimated. The organic solvents are characterized by several physical properties: dielectric constant (D), hydro-phobicity (log P), concentration of hydroxyl groups ([OH]), polarizability (α), Kamlet-Taft parameter (β) and Kosower parameter (Z). The relationships between the initial rate, kinetic constants and medium properties are analyzed by linear and multiple linear regression.
机译:水-醇(甲醇,乙醇,丙-1-醇,丙-2-醇,乙烷-1,2-二醇和丙烷-1,2,3-三醇)二元混合物对过氧化氢分解动力学的影响在牛肝过氧化氢酶存在下进行了研究。在所有溶剂中,过氧化氢酶的活性都比在水中小。在简单的动力学模型的基础上讨论了结果。估计了通过酶-底物复合物分解形成产物和过氧化氢酶失活的动力学常数。有机溶剂的特征在于几种物理性质:介电常数(D),疏水性(log P),羟基浓度([OH]),极化率(α),卡姆勒塔夫脱参数(β)和科索尔参数( Z)。通过线性和多元线性回归分析初始速率,动力学常数和介质性质之间的关系。

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  • 来源
    《Bioprocess and Biosystems Engineering》 |2012年第9期|p.1523-1530|共8页
  • 作者单位

    Department of Physical Chemistry, Faculty of Chemistry, University of Bucharest, Bd. Regina Elisabeta, Nr. 4-12, 030018 Bucharest, Romania;

    Department of Physical Chemistry, Faculty of Chemistry, University of Bucharest, Bd. Regina Elisabeta, Nr. 4-12, 030018 Bucharest, Romania;

    LaborQ, University of Bucharest, Bd. Regina Elisabeta, Nr. 4-12, 030018 Bucharest, Romania;

    Department of Physical Chemistry, Faculty of Chemistry, University of Bucharest, Bd. Regina Elisabeta, Nr. 4-12, 030018 Bucharest, Romania;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    catalase kinetics; hydrogen peroxide decomposition; solvent effects;

    机译:过氧化氢酶动力学;过氧化氢分解溶剂效应;

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