Document Detail

Formation of modified fatty acids and oxyphytosterols during refining of low erucic acid rapeseed oil.
MedLine Citation:
PMID:  12848499     Owner:  NLM     Status:  MEDLINE    
Formation of trans fatty acids and cyclic fatty acid monomers was investigated during refining of low erucic acid rapeseed oil. The first steps of the refining process, that is, degumming, neutralization, and bleaching, hardly modified the fatty acid profile. In contrast, deodorization produced substantial quantities of trans fatty acids (>5% of total fatty acids) and small amounts of cyclic fatty acid monomers (650 mg of cyclic fatty acid monomers/kg of oil) when severe conditions (5-6 h at 250 degrees C) were used. Alpha-linolenic acid was the main precursor of cyclic fatty acid monomers. The influence of deodorization on the chemical composition of low erucic acid rapeseed oil was studied additionally. Whereas free fatty acids, peroxides, and tocopherols decreased, neither total polar compounds nor oxyphytosterols changed during deodorization. Oxyphytosterols were identified by GC-MS. Three oxyphytosterols not yet observed in oil were tentatively identified as 6beta-hydroxycampestanol, 6beta-hydroxysitostanol, and 6beta-hydroxybrassicastanol. Brassicasterol oxides were the most abundant oxyphytosterols.
Pierre Lambelet; André Grandgirard; Stéphane Gregoire; Pierre Juaneda; Jean-Louis Sebedio; Constantin Bertoli
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  51     ISSN:  0021-8561     ISO Abbreviation:  J. Agric. Food Chem.     Publication Date:  2003 Jul 
Date Detail:
Created Date:  2003-07-09     Completed Date:  2003-09-09     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:  4284-90     Citation Subset:  IM    
Nestlé Research Center, P.O. Box 44, 1000 Lausanne 26, Switzerland.
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MeSH Terms
Erucic Acids / analysis*
Fatty Acids / analysis*,  chemistry
Food Handling*
Gas Chromatography-Mass Spectrometry
Hot Temperature
Peroxides / analysis
Phytosterols / analysis*
Plant Oils / chemistry*
Tocopherols / analysis
Reg. No./Substance:
0/Erucic Acids; 0/Fatty Acids; 0/Peroxides; 0/Phytosterols; 0/Plant Oils; 1072-39-5/erucic acid; 1406-66-2/Tocopherols; 8002-13-9/rapeseed oil

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

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