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- W2319007006 abstract "Procyanidin dimers and trimers, needed as reference compounds for biological studies, have been synthesized from various natural sources using a semisynthetic approach and purified by high-speed countercurrent chromatography (HSCCC). In the past, it has been difficult to elucidate the structure of these compounds, especially the determination of the interflavanoid bond. Here, the structure of two B-type procyanidin dimers, with (+)-catechin ((+)-C) in the upper unit, and eight C-type procyanidin trimers, with (−)-epicatechin ((−)-EC) in the upper unit, have been elucidated using low-temperature 1H NMR spectroscopy, as well as circular dichroism (CD) spectroscopy. This is the first time NOE interactions have been used to characterize the interflavanoid linkage in underivatized procyanidin trimers. Complete analyses of procyanidin C1 (−)-EC-4β→8-(−)-EC-4β→8-(−)-EC, (−)-EC-4β→8-(−)-EC-4β→8-(+)-C, (−)-EC-4β→6-(−)-EC-4β→8-(−)-EC, (−)-EC-4β→6-(−)-EC-4β→8-(+)-C, (−)-EC-4β→8-(−)-EC-4β→6-(−)-EC, (−)-EC-4β→8-(−)-EC-4β→6-(+)-C, (−)-EC-4β→8-(+)-C-4α→8-(−)-EC, procyanidin C4 (−)-EC-4β→8-(+)-C-4α→8-(+)-C, and procyanidin dimers B6 (+)-C-4α→6-(+)-C and B8 (+)-C-4α→6-(−)-EC are presented." @default.
- W2319007006 created "2016-06-24" @default.
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- W2319007006 date "2010-12-08" @default.
- W2319007006 modified "2023-10-13" @default.
- W2319007006 title "Structure Elucidation of Procyanidin Oligomers by Low-Temperature <sup>1</sup>H NMR Spectroscopy" @default.
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- W2319007006 doi "https://doi.org/10.1021/jf1032334" @default.
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