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Binding and Precipitation of Germanium(IV) by Penta- O-galloyl-β-d-glucose

Binding and Precipitation of Germanium(IV) by Penta- O-galloyl-β-d-glucose

Liangliang Zhang, Yuchen Liu, Xinyu Hu, Yongmei Wang, Man Xu

J Agric Food Chem. 2018 Oct 24;66(42):11000-11007.

PMID: 30284441

Abstract:

Complex formation and precipitation of germanium by a well-characterized hydrolyzable tannin, 1,2,3,4,6-penta- O-galloyl-β-d-glucose (PGG), was studied in this work. Two simple phenolic compounds, methyl gallate and gallic acid, were also used for comparison purposes. The influence of pH on the stoichiometry and conditional association constants (log K) of the germanium complexes was investigated. UV-visible spectroscopy showed the successive formation of GePGG and Ge2PGG at pH 6.0 and of GePGG at pH 4.0. The results of the precipitation experiments indicated that germanium precipitation was influenced by organic solvents, pH values, the germanium/PGG ratio, and the presence of zinc. Acetone had the biggest effect on the solubility of these complexes, and lower pH values favored the precipitation of the complex. The results showed that a germanium/PGG ratio of more than 3:1 was essential for precipitation. Furthermore, the presence of zinc ions in the solution decreased the precipitation.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP7440564	Germanium		7440-56-4	Price

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