High-resolution NMR and diffusion-ordered spectroscopy of port wine
High-resolution NMR and diffusion-ordered spectroscopy of port wine
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DOI：
10.1021/jf049797u
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发表时间：
2004-06-16
影响因子：
6.1
通讯作者：
Morris, GA
中科院分区：
文献类型：
--
作者：
Nilsson, M;Duarte, IF;Morris, GA
使用高分辨率核磁共振和高分辨率扩散有序光谱（DOSY）的特性选定的端口葡萄酒样品的不同年龄的目的，确定组成的变化。传统的1D和2D NMR方法能够识别约35种化合物，包括一些中链醇，氨基酸和有机酸等次要组分。高分辨率（HR）DOSY扩展了样品表征，通过提供有关代谢物相对分子大小的信息，增加了鉴别的化合物数量和NMR分配。不同年份的波特酒主要在以下几个方面存在差异：（a）有机酸和某些氨基酸的含量;（B）一种未鉴定的可能的二糖;（c）大的芳香种类。在最老的葡萄酒中，这些最后的高Mn芳香族化合物的相对量被认为显著降低，如从已知的在红葡萄酒老化期间花青素苷基聚合物的形成和沉淀所预期的。
The use of high-resolution NMR and high-resolution diffusion-ordered spectroscopy (DOSY) for the characterization of selected Port wine samples of different ages with the aim of identifying changes in composition is described. Conventional 1D and 2D NMR methods enabled the identification of about 35 compounds, including minor components such as some medium-chain alcohols, amino acids, and organic acids. High-resolution (HR) DOSY extended sample characterization, increasing the number of compounds identified and NMR assignments made, by providing information on the relative molecular sizes of the metabolites present. Port wines of different ages were found to differ mainly in their content of (a) organic acids and some amino acids, (b) an unidentified possible disaccharide, and (c) large aromatic species. The relative amount of these last high M,, aromatics is seen to decrease significantly in the oldest wine, as expected from the known formation and precipitation of anthocyanin-based polymers during red wine aging.