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Particular behavior of epoxy xanthophylls during veraison and maturation of grape
- Razungles, A.J., Babic, I., Sapis, J.C., Bayonove, C.L.
- Journal of agricultural and food chemistry 1996 v.44 no.12 pp. 3821-3825
- grapes, Vitis vinifera, wine cultivars, maturity stage, xanthophylls, quantitative analysis
- Seven carotenoids (beta-carotene, lutein, flavoxanthin, lutein-5,6-epoxide, luteoxanthin, violaxanthin, and neoxanthin) have been identified and quantitatively determined in three grape cultivars (Muscat of Alexandria, Sauvignon, and Syrah) during the maturation period and in mature grapes. Evidence is presented that lutein-5,6-epoxide, luteoxanthin, and violaxanthin have a particular behavior with consistent rises around the end of veraison. This evolution appears quite different for beta-carotene and lutein, the highest grape carotenoids, and for flavoxanthin and neoxanthin, which decrease at the same period. The chief role of veraison in the fate of grape carotenoids is discussed.