Parameters Involved in MLF of Wine Aliphatic Aldehydes, Acetaldehyde, Diacetyl and Acetoin

Parameters Involved in MLF of Wine Aliphatic Aldehydes, Acetaldehyde, Diacetyl and Acetoin 

The average contents of the carbonyl compounds identified in a Chardonnay and a Cabernet Sauvignon wine before and after MLF performed by inoculation of two different Oenococcus oeni commercial strains, are reported in Table 1.5. 

PEG/DVB fibre. In these conditions, the method shows good linearity, and sufficient accuracy and repeatability for all three compounds. 

To perform the analysis using an ion trap system allows the operation of normal scan recording, and collision induced dissociation (CID) experiments by selecting [M + H]+ ion of diacetyl-mono derivatives at 

Quantitative analysis is performed operating in SCAN mode on the signal of [M + H]+ ions at m/z 240 for acetaldehyde, at m/z 282 for diacetyl and at m/z 336 for internal standard, and on the signal at m/z 266 of [M + H — 18]+ ion for acetoin. The method shows a lower sensitivity in the detection of acetoin with respect to the other two compounds, probably due to the lower volatility of acetoin-derivatives and the higher polarity the higher steric hindrance of this compound might influence the derivatization reaction yield. 

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