Abstract：
:The presence of monomeric and dimeric flavan-3-ol monohexosides was investigated in grapes and wines. Polyphenol extracts were prepared from grape seeds and skins (Syrah, Merlot, and Cabernet-Sauvignon) sampled at three different developmental stages. Different wines (Tannat, Alicante, Syrah, Merlot, and Grenache) were also studied. The different samples obtained were analyzed by UPLC-ESI-IT-MS. Specific molecular ions corresponding to flavan-3-ol hexosides were detected by using targeted molecular ions with specific m/z values: 451 for (epi)catechin hexosides, and 739 for procyanidin dimer hexosides. 4'-O-β-glucosyl-(+)-catechin and 7-O-β-glucosyl-(+)-catechin were obtained by using a glucosyl transferase from apple, UGT71A15, and their structures determined by NMR. These glucosylated monomers and the dimers were identified in all analyzed grape seed and several skin extracts at the different stages and in wines made from different varieties.
journal_name
Food Chemjournal_title
Food chemistryauthors
Zerbib M,Mazauric JP,Meudec E,Le Guernevé C,Lepak A,Nidetzky B,Cheynier V,Terrier N,Saucier Cdoi
10.1016/j.foodchem.2018.06.019subject
Has Abstractpub_date
2018-11-15 00:00:00pages
441-448eissn
0308-8146issn
1873-7072pii
S0308-8146(18)30970-1journal_volume
266pub_type
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