A Simple GC-MS/MS Method for Determination of Smoke Taint-Related Volatile Phenols in Grapes

Volatile phenols (VPs) derived from smoke-exposed grapes are known to confer a smoky flavor to wine. Current methods for determination of VPs in grape berries either involve complex sample purification/derivatization steps or employ two analytical platforms for free and bound VP fractions. We report...

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Bibliographic Details
Published in:Metabolites
Main Authors: Zhiqian Liu, Vilnis Ezernieks, Priyanka Reddy, Aaron Elkins, Christian Krill, Kieran Murphy, Simone Rochfort, German Spangenberg
Format: Article
Language:English
Published: MDPI AG 2020-07-01
Subjects:
grapes
volatile phenols
smoke taint
GC-MS
Online Access:https://www.mdpi.com/2218-1989/10/7/294
Description
Summary:Volatile phenols (VPs) derived from smoke-exposed grapes are known to confer a smoky flavor to wine. Current methods for determination of VPs in grape berries either involve complex sample purification/derivatization steps or employ two analytical platforms for free and bound VP fractions. We report here a simple gas chromatography-tandem mass spectrometry (GC-MS/MS) method for quantification of both free and bound VPs in grapes, based on optimized (1) GC-MS/MS parameters, (2) an analyte extraction procedure, and (3) phenol glycoside hydrolysis conditions. Requiring neither sample cleanup nor a derivatization step, this method is sensitive (LOD ≤ 1 ng/g berries) and reproducible (RSD < 12% for repeated analyses) and is expected to significantly reduce the sample turnover time for smoke taint detection in vineyards.
ISSN:2218-1989

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