Document Detail


Survey of 3-alkyl-2-methoxypyrazine content of South African Sauvignon blanc wines using a novel LC-APCI-MS/MS method.
MedLine Citation:
PMID:  19807097     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
An LC-MS/MS method for the trace-level determination of 3-alkyl-2-methoxypyrazines in Sauvignon blanc wines is described. 3-Isobutyl-2-methoxypyrazine (IBMP), 3-isopropyl-2-methoxypyrazine (IPMP) and 3-sec-butyl-2-methoxypyrazine (SBMP) were analyzed by reversed phase liquid chromatography coupled to atmospheric pressure chemical ionization, as electrospray ionization was found to suffer from matrix quenching effects. A sample preparation method involving distillation of wine followed by solvent extraction and sufficient preconcentration was developed. Limits of detection and quantification for all three analytes were 0.03 ng/L and 0.10 ng/L, respectively, making the method more sensitive than gas chromatographic methods. IBMP was found to be the most abundant congener in South African Sauvignon blanc wines, with concentrations varying between 0.40 and 44 ng/L in 575 samples. IPMP and SBMP levels varied from <0.03 to 3.9 and <0.03 to 3.2 ng/L, respectively. Statistical investigation indicated no clear correlation between methoxypyrazine content and either geographical origin or vintage. The method was also successfully applied for the quantitation of IBMP in five additional South African wine varieties, including three red wine cultivars. The developed method represents a powerful new tool for the in-depth investigation of these important wine aroma constituents.
Authors:
Philippus Alberts; Maria A Stander; Sylvia O Paul; Andre de Villiers
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Publication Detail:
Type:  Evaluation Studies; Journal Article    
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  57     ISSN:  1520-5118     ISO Abbreviation:  J. Agric. Food Chem.     Publication Date:  2009 Oct 
Date Detail:
Created Date:  2010-06-21     Completed Date:  2010-10-04     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  9347-55     Citation Subset:  IM    
Affiliation:
Department of Chemistry and Polymer Science, University of Stellenbosch, Private Bag X1, Matieland, 7602, South Africa.
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MeSH Terms
Descriptor/Qualifier:
Chromatography, Liquid / methods*
Pyrazines / analysis*
South Africa
Tandem Mass Spectrometry / methods*
Wine / analysis*
Chemical
Reg. No./Substance:
0/Pyrazines; 24683-00-9/2-isobutyl-3-methoxypyrazine

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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