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American Chemical Society, Journal of Chemical and Engineering Data, 3(56), p. 532-540

DOI: 10.1021/je101075q

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Iron(III), Chromium(III), and Copper(II) Complexes ofl-Norvaline and Ferulic Acid

Journal article published in 2011 by Artik Elisa Angkawijaya, Ahmed E. Fazary, Erzalina Hernowo, Mohamed Taha ORCID, Yi-Hsu Ju
This paper is available in a repository.
This paper is available in a repository.

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Abstract

The complexation equilibria of L-norvaline (Nva) and ferulic acid (FA) were studied in aqueous solutions at room temperature (298 K) and in fixed ionic strength (0.15 mol.dm(-3) NaNO(3)) by means of potentiometry and spectrophotometry techniques. The ferric (Fe(3+)), chromium (Cr(3+)), and cupric (Cu(2+)) complexing capacities of Nva and FA and their overall stability constants in aqueous solutions were obtained by the HYPERQUAD 2008 program from the potentiometric data. The concentration distributions of the various complex specia in solution were evaluated and discussed. The spectroscopic UV-visible measurements are carried out to give qualitative information about the confirmation of the complexes formed in these solutions.