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NMR of anthocyanins: Assignments and effects of exchanging aromatic protons
Author(s) -
Pedersen Atle T.,
Andersen Øyvind M.,
Aksnes Dagfinn W.,
Nerdal Willy
Publication year - 1993
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260311104
Subject(s) - chemistry , heteronuclear molecule , aglycone , two dimensional nuclear magnetic resonance spectroscopy , deuterium , carbon 13 nmr , proton nmr , proton , stereochemistry , nuclear magnetic resonance spectroscopy , glycoside , physics , quantum mechanics
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.