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NMR of anthocyanins: Assignments and effects of exchanging aromatic protons

✍ Scribed by Atle T. Pedersen; Øyvind M. Andersen; Dagfinn W. Aksnes; Willy Nerdal

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
459 KB
Volume
31
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

Pelargonidin‐3‐O‐β‐glucopyranoside was isolated from an acidified methanolic extract of frozen strawberries, purified by several chromatographical techniques and subjected to homo‐ and heteronuclear proton and carbon NMR analysis, including selective decoupling, DQF‐COSY, NOESY, SEFT, HMQC and HMBC. Several strategies for the unambiguous assignment of the aglycone H‐6 and H‐8 resonances are discussed. Secondary isotope effects and different deuterium exchange rates of the protons were found.

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