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Molecules 2010, 15(11), 7763-7774; doi:10.3390/molecules15117763
Article

Changes of Flavan-3-ols with Different Degrees of Polymerization in Seeds of ‘Shiraz’, ‘Cabernet Sauvignon’ and ‘Marselan’ Grapes after Veraison

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Centre for Viticulture and Enology, College of Food Science & Nutritional Engineering, China Agricultural University, Beijing 100083, China These authors contributed equally to this work.
* Author to whom correspondence should be addressed.
Received: 12 October 2010 / Revised: 19 October 2010 / Accepted: 1 November 2010 / Published: 2 November 2010
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Abstract

Flavan-3-ols consist of flavan-3-ol monomers and polymers with different degrees of polymerization (DP). In this study, flavan-3-ol extracts from grape seeds were well separated into three fractions including monomers, oligomers (2 < DP < 10) and polymers (DP > 10), by means of normal-phase HPLC-MS. The different patterns of these three fractions were analyzed in three Vitis vinifera cultivars (‘Shiraz’, ‘Cabernet Sauvignon’ and ‘Marselan’) seeds from veraison to harvest. The results showed: (1) polymers were the main form of flavan-3-ols in grape seeds and monomers accounted for only a small proportion; (2) the contents of flavan-3-ol monomers in the seeds of three grape cultivars all exhibited a gradually decreasing trend with a little fluctuation, whereas the patterns of the change of contents of oligomers and polymers were extremely different among grape cultivars; the contents of flavan-3-ol oligomers were enhanced in the seeds of ‘Cabernet Sauvignon’, but were reduced in the other two cultivars; (3) with regard to the proportion of flavan-3-ols with a certain DP to total flavan-3-ols, both flavan-3-ol monomers and flavan-3-ols with low DP fell in proportion, while the flavan-3-ols with high DP increased correspondingly. These findings indicate that flavan-3-ol polymerization in developing seeds is variety-dependent and may be genetically regulated.
Keywords: flavan-3-ols; grape seeds; degree of polymerization; normal-phase HPLC-MS flavan-3-ols; grape seeds; degree of polymerization; normal-phase HPLC-MS
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Liu, Y.-X.; Pan, Q.-H.; Yan, G.-L.; He, J.-J.; Duan, C.-Q. Changes of Flavan-3-ols with Different Degrees of Polymerization in Seeds of ‘Shiraz’, ‘Cabernet Sauvignon’ and ‘Marselan’ Grapes after Veraison. Molecules 2010, 15, 7763-7774.

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