Details

Autor(en) / Beteiligte

• Peterson, Ana
• Cholet, Céline
• Geny, Laurence
• Darriet, Philippe
• Landais, Yannick
• Pons, Alexandre

Titel

Identification and analysis of new α- and β-hydroxy ketones related to the formation of 3-methyl-2,4-nonanedione in musts and red wines

Ist Teil von

• Food chemistry, 2020-02, Vol.305, p.125486-125486, Article 125486

Ort / Verlag

England: Elsevier Ltd

Erscheinungsjahr

2020

Quelle

MEDLINE

Beschreibungen/Notizen

• The formation of 3-methyl-2,4-nonanedione (MND) during red wine aging can contribute to the premature evolution of aroma, characterized by the loss of fresh fruit and development of dried fruit flavors. The identification of two new hydroxy ketones, 2-hydroxy-3-methylnonan-4-one (syn- and anti-ketol diastereoisomers) and 3-hydroxy-3-methyl-2,4-nonanedione (HMND), prompted the investigation of the precursors and pathways through which MND is produced and evolves. An HS-SPME-GC-MS method was optimized for their quantitation in numerous must and wine samples, providing insight into the evolution of MND, HMND, and ketols through alcoholic fermentation and wine aging. Alcoholic fermentation resulted in a significant decrease in MND and HMND and the simultaneous appearance of ketol diastereoisomers. The analysis of 167 dry red wines revealed significant increases in MND and anti-ketol contents through aging and a significant positive correlation between MND and anti-ketols. Additional experiments demonstrated that ketols are precursors to MND during red wine oxidation. •New hydroxy ketones identified and quantitated in must and wine for the first time•3-methyl-2,4-nonanedione is reduced during fermentation, yielding syn- and anti-ketols.•3-hydroxy-3-methyl-2,4-nonanedione significantly decreases during fermentation.•Syn- and anti-ketols are precursors to 3-methyl-2,4-nonanedione in red wine.•3-methyl-2,4-nonanedione and anti-ketols increase during red wine aging.