Document Detail

Concentrations of functional lipids in abraded fractions of hulless barley and effect of storage.
MedLine Citation:
PMID:  18803704     Owner:  NLM     Status:  MEDLINE    
Hulless barley kernels were sequentially abraded to achieve 4%, 8%, 16%, 24%, 32%, and 40% removal. Abraded fines, kernels, and ground kernels were stored at 35 degrees C and 75% relative humidity for 3 wk. Stored samples were extracted and the levels of oil, free phytosterols, tocopherols (Ts), and tocotrienols (T3s) were analyzed and compared with freshly abraded fractions. The results revealed that oil, sterols, and Ts were concentrated in the outer layers, particularly in the germ layer. In whole kernels, homologues of both Ts and T3s showed the same ranking order in concentrations as alpha > gamma > beta > delta. The homologue composition of Ts remained the same but that of T3s changed across the kernel. The %T3 in total tocols increased in fractions with increasing endosperm tissue. Storage caused no change in oil and Ts but significant changes in sterols and T3s. The changes were differential among T3 isomers, with alpha-T3 decreasing and delta-T3 increasing. The degradation of alpha-T3 was accelerated in fractions with more endosperm tissue. Grinding kernel samples before storage accelerated sterol degradation but had a limited effect on changes of T3s. A 2nd experiment using a different hulless barley line and ambient storage for 6 mo confirmed all the findings except that the changing trend for sterols was inconsistent. These results provide practical information to those who wish to produce a barley fraction enriched with a particular functional lipid and maintain stability of their products.
K S Liu; R A Moreau
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Publication Detail:
Type:  Journal Article     Date:  2008-08-19
Journal Detail:
Title:  Journal of food science     Volume:  73     ISSN:  1750-3841     ISO Abbreviation:  J. Food Sci.     Publication Date:  2008 Sep 
Date Detail:
Created Date:  2008-09-22     Completed Date:  2009-01-30     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0014052     Medline TA:  J Food Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  C569-76     Citation Subset:  IM    
Grain Chemistry and Utilization Laboratory, Natl Small Grains Germplasm Research Facility, USDA, ARS, Aberdeen, ID 83210, USA.
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MeSH Terms
Food Preservation
Hordeum / chemistry*
Lipids / analysis*
Phytosterols / analysis
Plant Oils / analysis
Seeds / chemistry
Tocopherols / analysis*
Tocotrienols / analysis*
Reg. No./Substance:
0/Lipids; 0/Phytosterols; 0/Plant Oils; 0/Tocotrienols; 1406-66-2/Tocopherols

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

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