Structures in the Hordatine Family with cw-CinnamoyL Moieties

摘要

Three hordatine derivatives (4'-O-β-D-glucopyranosyl hordatine A, 4'-O-β-D-gLucopyranosyL hordatine B, and 4'-O-β-D-maltosyl hordatine A) have already been isolated from acrospires in barley malt as astringent substances. All of these substances possess a common rrans-cinnamoyl moiety. In the astringent fraction, we have now also identified the corresponding cis-cinnamoy derivatives: 4'-O-β-D-glucopyranosyl (1"Z)-hordatine A, 4'-O-β-D-glucopyranosyl (l"Z)-hordatine B, and 4'-O-β-D-maltosyl (l"Z)-hordatine A. Their chemical structures were elucidated by mass and NMR spectrometry.