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S.R. Przewloka, B.J. Shearer

The Further Chemistry of Ellagic Acid II. Ellagic Acid and Water-Soluble Ellagates as Metal Precipitants

Preparations of the previously unreported, water-soluble, tetraguanidinium, tetracholine and tetrakisbenzyltrimethylammonium ellagates are outlined. Ellagic acid and these water-soluble salts remove Mg²⁺, Ca²⁺ and Mn²⁺ ions from dilute aqueous solutions at pH greater than 7. The salts also remove Fe²⁺, Fe³⁺, Co²⁺ and Cu²⁺ between pH 3 and pH 6. At pH 1 the water-soluble ellagates underwent hydrolysis, resulting in the precipitation of free ellagic acid in preference to the formation of metal-ellagate complexes. These trends were also observed when mixtures of metal ions were applied.

Holzforschung, Walter de Gruyter

Print ISSN: 0018-3830
Volume: 56, 02/2002
Pages: 13 - 19

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