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首页> 外文期刊>Journal of Agricultural and Food Chemistry >PRECIPITATION OF METAL IONS BY PLANT POLYPHENOLS - OPTIMAL CONDITIONS AND ORIGIN OF PRECIPITATION
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PRECIPITATION OF METAL IONS BY PLANT POLYPHENOLS - OPTIMAL CONDITIONS AND ORIGIN OF PRECIPITATION

机译：植物多酚对金属离子的析出-析出的最佳条件和来源。

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摘要

Precipitation of copper(II) and zinc(II) by low molecular weight phenols, penta-O-galloyl-beta-D-glucose, and commercial tannins is studied at pH 5. The extent of copper precipitation, higher than that of zinc, depends on the initial concentration of both copper and phenolic compounds and on the control of acidification which results from complexation. The copper/phenol ratio in the precipitate, determined by elemental analysis, is independent of the initial concentration of catechol. However, it increases with chestnut tannin when the metal concentration is increased to a value corresponding to complexation with all o-dihydroxyphenyl chelating groups in the molecule. Stability of the precipitates obtained with coppper(II) and various polyphenols in water, acetic acid, and ethylenediaminetetraacetic acid solutions is determined. Models for metal/polyphenol precipitation are proposed.
机译：在pH 5下研究了低分子量酚，五-O-galloyl-β-D-葡萄糖和商业单宁对铜（II）和锌（II）的沉淀。铜的沉淀程度高于锌，取决于铜和酚类化合物的初始浓度以及络合导致的酸化控制。通过元素分析确定的沉淀物中铜/苯酚的比例与邻苯二酚的初始浓度无关。然而，当金属浓度增加到与分子中所有邻二羟基苯基螯合基团络合的值时，栗栗单宁会增加。测定了由铜（II）和各种多酚在水，乙酸和乙二胺四乙酸溶液中获得的沉淀物的稳定性。提出了金属/多酚沉淀模型。

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