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Updated: Aug 9, 2025

HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin
Published on: July 23, 2016
First identification of a new molecule involved in the fresh mushroom off-flavor in wines: 1-hydroxyoctan-3-one
Léa Delcros1, Arnaud Costis2, Christine Le Guerneve2
1MHCS, Epernay, France; Comité Champagne, Epernay, France; UMR SPO, Univ Montpellier INRAE, Institut Agro, Montpellier, France.
Abstract:
The fresh mushrooms off-flavor (FMOff) has been appearing in wines since the 2000 s; the C8 compounds, 1-octen-3-one, 1-octen-3-ol and 3-octanol are involved in this specific taint, yet they alone do not fully explain its occurrence. The objective of this work was to identify by GC-MS new FMOff markers in contaminated matrices, to correlate compound levels with wine sensory characterization and to determine the sensory attributes of 1-hydroxyoctan-3-one, a new candidate involved in FMOff. In practice, grape musts were artificially contaminated with Crustomyces subabruptus, and fermented to obtain tainted wines. GC-MS analysis of contaminated musts and wines revealed the presence of 1-hydroxyoctan-3-one only in contaminated musts, and not in the healthy control. In a selection of 16 wines affected by FMOff, the level of 1-hydroxyoctan-3-one correlated significantly (r2 = 0.86) with sensory analysis scores. Finally, 1-hydroxyoctan-3-one was synthesized and found to generate a fresh mushroom aroma in a wine matrix.
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