title: Role of carbonyl compounds in SO(2) binding phenomena in musts and wines from botrytized grapes.
abstract: Carbonyl compounds play an important role in musts from botrytized grapes. Some of them, such as glyoxal and methylglyoxal, may explain a considerable part of bindable SO(2). Others, such as 2- and 5-oxogluconic acids, produced by gluconic acid oxidation in proportions respectively from 2.5 per 1 play an interesting role as SO(2) binding indicator. Finally, the levels of some compounds such as dihydroxyacetone, 5-oxofructose, and delta-gluconolactone in balance with gluconic acid are well correlated with SO(2) binding powers and also explain a large part of the bindable SO(2) in musts. During alcoholic fermentation, only dihydroxyacetone among these three compounds is metabolized by yeast. Thus, two compounds present in grapes, delta-gluconolactone and 5-oxofructose, with three yeast SO(2)-binding byproducts, ethanal, pyruvic, and 2-oxoglutaric acids, explain much of the SO(2) binding power in wines from botrytized grapes.
authors.affiliation: Faculté d'OEnologie, Unité Associée INRA/Université Victor Segalen Bordeaux 2, Talence, France.
authors.forename: J C
authors.initials: JC
authors.lastname: Barbe
authors.forename: G
authors.initials: G
authors.lastname: de Revel
authors.forename: A
authors.initials: A
authors.lastname: Joyeux
authors.forename: A
authors.initials: A
authors.lastname: Lonvaud-Funel
authors.forename: A
authors.initials: A
authors.lastname: Bertrand
mesh_terms: D020171:Botrytis / Q000302:isolation & purification*; D002255:Carbonic Acid / Q000378:metabolism*; D019685:Rosales / Q000737:chemistry* / Q000382:microbiology; D013464:Sulfuric Acids / Q000378:metabolism*
chemical_list: D013464:Sulfuric Acids; D002255:Carbonic Acid