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Structural characterization of a procyanidin tetramer and pentamer from the apple by low-temperature NMR analysis |
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| Authors: | Yutaka Abe Nobuo Kawahara Tomomasa Kanda Yoshihiro Ozeki |
| Institution: | a Department of Biotechnology and Life Science, Faculty of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan b Research Laboratories for Health & Gustatory Science, Asahi Breweries, Ltd, 1-21 Midori 1-chome, Moriya, Ibaraki 302-0106, Japan c National Institute of Health and Sciences, 1-18-1, Kamiyoga, Setagaya-ku, Tokyo 158-8501, Japan |
| Abstract: | 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)]. |
| Keywords: | HMBC heteronuclear multiple bond connectivity HMQC heteronuclear multiple quantum coherence HPLC high-performance liquid chromatography MALDI-TOF/MS matrix-assisted laser desorption ionization time of flight mass spectrometry MS mass spectrometry NMR nuclear magnetic resonance RT retention time |
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