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首页> 外文期刊>Journal of mass spectrometry: JMS >Relative abundances of novel cyclic prodelphinidins in wine depending on the grape variety
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Relative abundances of novel cyclic prodelphinidins in wine depending on the grape variety

机译：葡萄种类葡萄酒中新型循环杂皮蛋白的相对丰富

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摘要

The identification of cyclic B-type procyanidins in grape and wine was recently disclosed. Some of these were also found in berries of totally different vegetal species (eg, Vaccinium sp.). However, presence of a wider class of these cyclic condensed tannin compounds with variably substituted monomers has never been addressed so far. Here, an extended list of oligomeric cyclic proanthocyanidins (PAC) bearing variable substitution patterns on the main flavan-3-ol unit has been searched in wines. Nearly 7600 theoretical structures were calculated and searched in red and white wine samples made from different grape varieties. Moreover, a hydrogen/deuterium exchange approach (already applied to a cyclic tetrameric procyanidin) coupled to high-resolution mass spectrometry was applied to confirm their cyclic B-type structure rather than a non cyclic A-type structure, otherwise isomeric and undistinguishable by LC-MS alone. The main group of novel cyclic PAC observed is shown to contain (epi)gallocatechin beside (epi)catechin as the constituent monomers.
机译：最近公开了葡萄和葡萄酒中环状B型原霉素的鉴定。其中一些也被发现在完全不同的植物物种（例如，vaccinium sp）中发现。然而，到目前为止，从未解决具有可变取代单体的较宽循环凝聚的单宁化合物的更广泛的这些循环凝聚的单宁化合物。这里，在葡萄酒中搜索了主氟烷-3-OL单元上的寡聚循环原花青素（PAC）轴承变换图案的延长列表。从不同葡萄品种制成的红色和白葡萄酒样本中计算近7600个理论结构并搜查。此外，施加氢气/氘交换方法（已经施加到环状四聚体ProCyanidin），耦合到高分辨率质谱法，以确认其环状B型结构而不是非环状A型结构，否则通过LC不可粘合 - 单独。观察到的主要新的新型环状PAC含有（EPI）儿茶素作为组成单体含有（EPI）GallocateChin。

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