Adsorption of Acid Phosphatase on Minerals and Soil Colloids in Presence of Citrate and Phosphate

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Adsorption of Acid Phosphatase on Minerals and Soil Colloids in Presence of Citrate and Phosphate

机译：柠檬酸和磷酸盐存在下酸性磷酸酶在矿物质和土壤胶体上的吸附

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The aim of this work was to study the influence of phosphate and citrate, which are common inorganic andorganic anions in soils, on the adsorption of acid phosphatase by kaolin, goethite and the colloids separatedfrom yellow-brown soil (YBS) and latosol (LS) in central-south China. The YBS colloid has the major claymineral composition of 1.4 nm mineral, illite and kaolinite while the LS colloid mainly contains kaolinite andoxides. The adsorption isotherm of acid phosphatase on the examined soil colloids and minerals fitted tothe Langmuir model. The amount of enzyme adsorbed in the absence of ligands was in the order of YBScolloid ＞LS colloid＞kaolin≈goethite. In the presence of phosphate or citrate, the amounts of the enzymeadsorbed followed the sequence YBS colloid＞kaolin＞LS colloid＞goethite. The presence of ligands alsodecreased the binding energy between the enzyme and soil colloids or minerals. With the increase of ligandconcentration from 10 mmol L-1 to 400 m mol L-1, different behaviors for the adsorption of enzyme werefound in the colloid and mineral systems studied. A sharp decrease in enzyme adsorption was observed ongoethite while gradual decreases of enzyme adsorption were recorded in the two soil colloid systems. However,no any decrease was found for the amount of enzyme adsorbed on kaolin at higher ligand concentrations.When phosphate or citrate was introduced to the system before the addition of enzyme, the ligands usuallyenhanced the adsorption of enzyme. The results obtained in this study suggested the important role ofkaolinite mineral in the adsorption of enzyme molecules in acidic soils in the presence of various ligands.

机译：这项工作的目的是研究土壤中常见的无机和有机阴离子磷酸根和柠檬酸对高岭土，针铁矿以及从黄棕色土壤（YBS）和Latosol（LS）分离的胶体吸附酸性磷酸酶的影响。在中国中南部。 YBS胶体的主要矿物组成为1.4 nm矿物，伊利石和高岭石，而LS胶体主要包含高岭石和氧化物。酸性磷酸酶在检验的土壤胶体和符合Langmuir模型的矿物质上的吸附等温线。在不存在配体的情况下，酶的吸附量为：YBS胶体＞ LS胶体＞高岭土≈针铁矿。在磷酸盐或柠檬酸盐存在下，酶的吸附量依次为YBS胶体＞高岭土＞ LS胶体＞针铁矿。配体的存在还降低了酶与土壤胶体或矿物质之间的结合能。随着配体浓度从10 mmol L-1增加到400 m mol L-1，在胶体和矿物系统中发现了不同的酶吸附行为。在两种针状胶体体系中，在针铁矿上均观察到酶吸附急剧下降，而酶吸附逐渐下降。然而，在较高的配体浓度下，高岭土上吸附的酶量没有发现任何下降。当在添加酶之前将磷酸盐或柠檬酸盐引入系统时，配体通常会增强酶的吸附。在这项研究中获得的结果表明，在存在各种配体的情况下，高岭石矿物在酸性土壤中的酶分子吸附中具有重要作用。

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《土壤圈（英文版）》 |2002年第4期|339-348|共10页
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Key Laboratory of Agricultural Microbiology, Department of Resources and Environment, Huazhong Agricultural University, Wuhan 430070 China;

Key Laboratory of Agricultural Microbiology, Department of Resources and Environment, Huazhong Agricultural University, Wuhan 430070 China;

Dipartimento di Scienze Chimico-Agrarie, University of Naples, via Universita 100, 80055 Portici, Napoli Italy;

Dipartimento di Scienze Chimico-Agrarie, University of Naples, via Universita 100, 80055 Portici, Napoli Italy;

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原文格式 PDF
正文语种 chi
中图分类土壤学;
关键词
acid phosphatase; adsorption; goethite; kaolin; soil colloid;

机译：酸性磷酸酶吸附针铁矿高岭土土壤胶体;

Adsorption of Acid Phosphatase on Minerals and Soil Colloids in Presence of Citrate and Phosphate

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