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Type: Journal article
Title: Charge equilibria and pK values of 5-carboxypyranomalvidin-3-glucoside (vitisin A) by electrophoresis and absorption spectroscopy
Author: Asenstorfer, R.
Jones, G.
Citation: Tetrahedron: the international journal for the rapid publication of full original research papers and critical reviews in organic chemistr, 2007; 63(22):4788-4792
Publisher: Pergamon-Elsevier Science Ltd
Issue Date: 2007
ISSN: 0040-4020
Statement of
Robert E. Asenstorfer and Graham P. Jones
Abstract: Apparent pK values of the wine pigment, 5-carboxypyranomalvidin-3-glucoside (vitisin A), were determined using UV-vis spectroscopy, viz. pKa1=0.98 (±0.10), pKH1=4.51 (±0.03) and pKH2=7.57 (±0.02). An additional ionisation constant at high pH (pKa4=8.84±0.06) was established by high-voltage paper electrophoresis. These data in conjunction with previously published pKa values determined by high-voltage electrophoresis suggest that in wine (pH 3.2-3.8), 5-carboxypyranomalvidin-3-glucoside exists as a complex mixture of hydrated and non-hydrated, partially ionised species with the predominant species being the quinonoidal base (λmax 498 nm). © 2007 Elsevier Ltd. All rights reserved.
Description: Copyright © 2007 Elsevier Ltd All rights reserved.
DOI: 10.1016/j.tet.2007.03.052
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Appears in Collections:Agriculture, Food and Wine publications
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