Authors: Sobel, Sabrina; Haigney, Allison; Concepcion, Tracy; Kim, Michael

Source: Chemical Speciation and Bioavailability, Volume 20, Number 2, June 2008 , pp. 93-97(5)

Publisher: Science Reviews 2000 Ltd

Abstract:

The effect of added amino acid (glycine, alanine and serine) on the solubility of zinc citrate, zinc succinate and zinc oxalate was investigated. Equilibrated solutions were prepared and titrated to endpoint at pH 5.5 with Na₂EDTA using Xylenol Orange indicator. In every case, a significant enhancement in solubility was seen as the amino acid increased from 1 to 50 molar excess. The increase was non-linear, and, with zinc succinate, showed saturation effects. In these cases, solution composition may be more complicated than initially thought, including mixed-ligand complexes and increasing percent free metal ion as the proportion of amino acid increases.

Keywords: ZINC; AMINO ACIDS; COMPLEXATION; SOLUBILITY

Document Type: Research article

DOI: http://dx.doi.org/10.3184/095422908X322833

Publication date: 2008-06-01

More about this publication?

• Chemical Speciation & Bioavailability covers a rapidly expanding area in environmental science.

  Research on the interactions between the chemical forms and behaviour of toxic compounds and their subsequent biological uptake, metabolism and ecological fate involves many scientific fields. These studies are often published in discipline-specific journals, leading to inadequate review and information scatter. This situation hinders both the development of an international community of experienced colleagues and the open flow of information and discussion. Additionally, the importance of speciation and bioavailability research to the development of pollution law and control technologies is being increasingly appreciated by environmental regulatory agencies throughout the world.

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