Document Detail

Light-induced off-flavor development in cloudy apple juice.
MedLine Citation:
PMID:  17910509     Owner:  NLM     Status:  MEDLINE    
Cloudy apple juice has been found to develop off-flavors during storage in daylight. The development of off-flavors and volatile compounds was monitored in reconstituted juice prepared from 'Golden Delicious' and 'Fuji' apple concentrates stored in glass bottles under fluorescent light (3000 lx, 8 degrees C). A strong metallic off-flavor was formed by photooxidation. A major contributor to the off-flavor was identified as 1-octen-3-one by gas chromatography-olfactometry. In addition, six volatile compounds, pentanal, 2-methyl-1-penten-3-one, hexanal, (E)-2-heptenal, 6-methyl-5-hepten-2-one, and (E)-2-octenal, increased significantly after light exposure and could contribute to the off-flavor. Except for pentanal and hexanal, these volatiles were found only after light exposure. Higher levels of volatiles were observed in juice from 'Golden Delicious' apples than in juice from 'Fuji' apples, and this difference was consistent with higher levels of suspended solids. When the suspended solids were removed by centrifugation, the development of volatiles on exposure to light was reduced significantly.
Midori Hashizume; Michael H Gordon; Donald S Mottram
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Publication Detail:
Type:  Journal Article     Date:  2007-10-03
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  55     ISSN:  0021-8561     ISO Abbreviation:  J. Agric. Food Chem.     Publication Date:  2007 Oct 
Date Detail:
Created Date:  2007-10-29     Completed Date:  2007-12-27     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  9177-82     Citation Subset:  IM    
Department of Food Biosciences, University of Reading, Whiteknights, Reading RG6 6AP, United Kingdom.
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MeSH Terms
Aldehydes / analysis
Beverages / analysis*
Chemical Precipitation
Fruit / chemistry*
Ketones / analysis
Malus / chemistry*
Reg. No./Substance:
0/Aldehydes; 0/Ketones

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

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