| Polymerization of catechin catalyzed by Mn-, Fe- and Al-oxides. | |
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MedLine Citation:
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PMID: 20674290 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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The role of short-range order (SRO) metal oxides, which are common in acid soils and associated environments, in influencing the abiotic transformations of catechin, which is common in the soil of tea plantations, still remains poorly understood. The aim of this study was to investigate the catalytic power of SRO Mn(IV)-, Fe(III)- and Al-oxides in influencing the abiotic transformations of catechin. At the end of a 90-h reaction period, the release of CO(2) in all the oxide-catechin systems is higher than that for the system with only catechin. Polymerization of catechin is catalyzed and enhanced by SRO-oxides, as is indicated by the absorbance values of the supernatants, which were obtained via visible adsorption spectroscopy, and the yields of humic polymers. The sequence of the oxides that increased the yield of total humic polymers in these systems under ambient atmosphere is: Fe(III)-oxide>Mn(IV)-oxide>Al-oxide>>no catalyst (catechin). The electron spin resonance (ESR) and Fourier transformation infrared absorption spectrometry (FT-IR) of humic polymers formed in the oxide-catechin systems were similar to the spectra obtained from the humic polymers extracted from the soil. The catalytic power of SRO-oxides in promoting the oxidative polymerization of catechin, the resultant formation of humic substances, and C turnover in acid soils thus merit attention. |
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Authors:
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Yue Min Chen; Tsung Ming Tsao; Cheng Chung Liu; Pan Ming Huang; Ming Kuang Wang |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-07-13 |
Journal Detail:
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Title: Colloids and surfaces. B, Biointerfaces Volume: 81 ISSN: 1873-4367 ISO Abbreviation: Colloids Surf B Biointerfaces Publication Date: 2010 Nov |
Date Detail:
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Created Date: 2010-08-24 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9315133 Medline TA: Colloids Surf B Biointerfaces Country: Netherlands |
Other Details:
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Languages: eng Pagination: 217-23 Citation Subset: IM |
Copyright Information:
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Copyright (c) 2010. Published by Elsevier B.V. |
Affiliation:
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Department of Agricultural Chemistry, National Taiwan University, Taipei 106, Taiwan. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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