Adelaide Research & Scholarship
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https://hdl.handle.net/2440/41286
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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 Responsibility: | 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 |
| Description (link): | http://www.elsevier.com/wps/find/journaldescription.cws_home/942/description#description |
| Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest 6 |
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