Document Detail


Release of deuterated nonenal during beer aging from labeled precursors synthesized in the boiling kettle.
MedLine Citation:
PMID:  10552809     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The use of labeled nonenal enabled the demonstration that the appearance of the cardboard flavor in finished beer comes from lipid auto-oxidation during wort boiling and not from lipoxygenasic activity during mashing. Free trans-2-nonenal produced by linoleic acid auto-oxidation in the kettle disappears, owing to retention by wort amino acids and proteins. This binding linkage protects trans-2-nonenal from yeast reduction but is reversible, allowing release of the compound at lower pH during aging. Labeled trans-2-nonenal is detected after aging when deuterated precursors form in the boiling kettle. The amount of alkenal released correlates with the concentration of reversible associations in the pitching wort. This work brings new illumination to the formation of trans-2-nonenal and overturns many previous hypotheses. It also explains why a reduction in the beer pH intensifies the cardboard flavor.
Authors:
S Noël; C Liégeois; G Lermusieau; E Bodart; C Badot; S Collin
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  47     ISSN:  0021-8561     ISO Abbreviation:  J. Agric. Food Chem.     Publication Date:  1999 Oct 
Date Detail:
Created Date:  2000-02-11     Completed Date:  2000-02-11     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  4323-6     Citation Subset:  IM    
Affiliation:
Unité de Brasserie et des Industries Alimentaires, Université Catholique de Louvain, Place Croix du Sud 2/Bte 7, B-1348 Louvain-la-Neuve, Belgium.
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MeSH Terms
Descriptor/Qualifier:
Aldehydes / analysis*
Beer / analysis*
Deuterium / analysis
Food Preservation*
Hot Temperature
Humans
Odors
Taste
Chemical
Reg. No./Substance:
0/Aldehydes; 2463-53-8/2-nonenal; 7782-39-0/Deuterium

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


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