タンニンと共存物質との相互作用の効果(第2報)重金属イオンの還元および沈殿の可溶化

概要

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Upon examination of the precipitate-formation in the solution of geraniin, punicalin or tannic acid JP, mixed with that of Cd^<2+>, Cr^<6+>, Cu^<2+>, Fe^<3+>, Hg^<2+>, Mn^<2+>, Pb^<2+>, or Zn^<2+>, at pH 5.4,the amount of precipitate generally increased with an increase in concentration of tannin, in the experiments with lower tannin-concentration. However, the amount of precipitate decreased with an increase in concentration of punicalin or tannic acid JP, of 1×10^<-3>-5×10^<-3>_M, in several experiments. The precipitates once formed in these experiments were also solubilized upon further increase of the tannin concentration. Simultaneously, the amount of heavy metal in the supernatant liquor, and also the ratio of tannin to heavy metal in the precipitate increased. Extensive reduction of Cr^<6+>, Fe^<3+> and Cu^<2+>, along with the complex formation, occurred in the presence of tannins (geraniin, punicalagin and tannic acid JP) and (-)-epigallocatechin gallate. Each metal ion was determined by colorimetry, and the formation of soluble complex was exhibited by paper electrophoresis. These results indicate that the toxicity of metal ions could be reduced in the presence of tannins and polyphenols.
公益社団法人日本薬学会の論文
1982-08-25