期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 49, 期 6, 页码 2917-2923出版社
AMER CHEMICAL SOC
DOI: 10.1021/jf001398l
关键词
Vitis vinifera; Shiraz; Muscat; leaves; berries; aglycons; norisoprenoids
Glycoconjugates from Muscat of Alexandria and Shiraz leaves and grape berries were isolated by adsorption on Amberlite XAD-2 resin, and enzymatically released aglycons were analyzed by GC-FID and CC-MS. About 120 aglycons were fully or tentatively identified. Compositional differences were observed between leaves and berries of the two varieties in five aglycon chemical groups: C6 alcohols, aliphatic alcohols, monoterpenes, shikimates, and C-13-norisoprenoids, which were much more abundant in the leaves than in the berries. The differences observed for C-13-norisoprenoids were in agreement with their hypothetical independent biosynthesis in leaves and berries. Thus, 3-hydroxy-beta -damascone, an important norisoprenoid aglycon of grape berries, was not detected in leaves, whereas its oxidized derivative, 3-oxo-alpha -damascone, was absent in berries. Compositional differences were also observed between Muscat and Shiraz leaves. 3-Oxo-alpha -ionol was not detected in Shiraz leaves, and its retro derivatives were less abundant than in Muscat of Alexandria leaves. Conversely, in Shiraz leaves the levels of 7,8-dihydroionone derivatives, such as megastigman-3,9-diol and 3-oxo-7,8-dihydro-alpha -ionol, were higher than in Muscat of Alexandria leaves.
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