Structural characterization of a procyanidin tetramer and pentamer from the apple by low-temperature NMR analysis

The structures of a procyanidin tetramer and pentamer from unripe apple ( Malus pumila) were elucidated by low-temperature NMR analysis at −34 °C. These structures were [epicatechin-(4β→6)-epicatechin-(4β→8)-epicatechin-(4β→8)-epicatechin ( 1)] and [epicatechin-(4β→8)-epicatechin-(4β→8)-epicatechin-...

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Bibliographic Details
Published inTetrahedron letters Vol. 49; no. 45; pp. 6413 - 6418
Main Authors Abe, Yutaka, Shoji, Toshihiko, Kawahara, Nobuo, Kamakura, Hiroyuki, Kanda, Tomomasa, Goda, Yukihiro, Ozeki, Yoshihiro
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 03.11.2008
Subjects
Apple
Condensed tannin
Malus pumila
NMR
Oligomer
Pentamer
Procyanidin
Tetramer
MALDI-TOF/MS
RT
MS
HMBC
Malus pumila
Oligomer
Pentamer
NMR
Apple
Procyanidin
HMQC
Condensed tannin
Tetramer
HPLC
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Summary:The structures of a procyanidin tetramer and pentamer from unripe apple ( Malus pumila) were elucidated by low-temperature NMR analysis at −34 °C. These structures were [epicatechin-(4β→6)-epicatechin-(4β→8)-epicatechin-(4β→8)-epicatechin ( 1)] and [epicatechin-(4β→8)-epicatechin-(4β→8)-epicatechin-(4β→8)-epicatechin-(4β→8)-epicatechin ( 2)].
ISSN:0040-4039
1873-3581
DOI:10.1016/j.tetlet.2008.08.087