Relationship between grape surface mycobiota and wine aroma

BIGNERT, M.C.; MERÍN, M.G.; ROMANO, R.; MORATA DE AMBROSINI, V.I.

Punta del Este

Congreso; 41° World Congress of Vine and Wine (OIV 2018); 2018

OIV, INAVI (Uruguay)

Damaged grapes affect yeast ecology of grapes and wine but little is known about their impact on aroma profile of wine. The aim of the present work was to isolate and identify filamentous fungi and yeasts from sound and damaged grape from DOC San Rafael and study the impact of this mycobiota on the aromatic profile of the wines obtained from it. Enumeration and identification of fungi and yeasts present in sound and damaged grape allowed us to observe a significant modification of mycobiota of damaged grapes with respect to healthy grapes. The alteration of the ecological balance induced by rotten grapes was evidenced by the increase in counts as well as higher diversity of species of fungi (Botrytis, Aspergillus and Penicillium) and yeasts (Dekkera anomala and Zygosaccharomyces bailii) found. Aroma profile of resulting wines with a proportion of damaged grapes was affected with respect to wines obtained from healthy grapes, by observing an imbalance of aromatic series or loss of the characteristic aroma profile of Malbec wine and the detection of nutty and caramel notes in excess or signs of defect.