Document Detail

Stability of virgin olive oil. 1. Autoxidation studies.
MedLine Citation:
PMID:  11829634     Owner:  NLM     Status:  MEDLINE    
Virgin olive oil samples with similar oxidative stabilities and fatty acid compositions were stored for 24 months. Changes in the lipid substrate were followed by peroxide value and K(232) measurements. HPLC was used to evaluate changes in the alpha-tocopherol, pigment, and squalene contents. Total polar phenol content was measured colorimetrically. The loss of alpha-tocopherol and carotenoids was comparable with that of polar phenol content, suggesting an active participation in autoxidation. The limited role of squalene in autoxidation was further confirmed using an olive oil model and in the presence of alpha-tocopherol. Pheophytin a degradation was high, although spectrometric estimation of chlorophyll content did not indicate so. Evaluation of pheophytin a activity at three different levels of addition on the oil model indicated a concentration-dependent antioxidant role more pronounced at elevated temperatures, which could be partially due to the activity of certain degradation products.
Eleni Psomiadou; Maria Tsimidou
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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:  50     ISSN:  0021-8561     ISO Abbreviation:  J. Agric. Food Chem.     Publication Date:  2002 Feb 
Date Detail:
Created Date:  2002-02-06     Completed Date:  2002-04-23     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  United States    
Other Details:
Languages:  eng     Pagination:  716-21     Citation Subset:  IM    
Laboratory of Food Chemistry and Technology, School of Chemistry, Aristotle University of Thessaloniki, 54006 Thessaloniki, Greece.
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MeSH Terms
Carotenoids / analysis
Chlorophyll / analysis
Chromatography, High Pressure Liquid
Drug Stability
Fatty Acids / analysis
Food Preservation
Peroxides / analysis
Phenols / analysis
Pheophytins / analysis
Plant Oils / chemistry*
Squalene / analysis
alpha-Tocopherol / analysis
Reg. No./Substance:
0/Fatty Acids; 0/Peroxides; 0/Phenols; 0/Pheophytins; 0/Plant Oils; 111-02-4/Squalene; 1406-65-1/Chlorophyll; 36-88-4/Carotenoids; 59-02-9/alpha-Tocopherol; 8001-25-0/olive oil

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

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