September
2012
Volume
89
Number
5
Pages
242
—
246
Authors
Douglas C. Doehlert1,2 and
Senay Simsek3
Affiliations
U.S. Department of Agriculture, Agricultural Research Service, Hard Red Spring and Durum Wheat Quality Laboratory, Harris Hall, North Dakota State University, Dept. 7640, P.O. Box 6050, Fargo, ND 58108-6050. Mention of trade names or commercial products in this publication is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the U.S. Department of Agriculture.
Corresponding author. Phone: (701) 239-1413. Fax: (701) 239-1377. E-mail: douglas.doehlert@ndsu.edu
Department of Plant Sciences, North Dakota State University, Dept. 7650, P.O. Box 6050, Fargo, ND 58108-6050.
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RelatedArticle
Accepted July 11, 2012.
Abstract
Effects of genotype and environment on (1→3), (1→4)-β-D-glucan (β-glucan) extractability, flour slurry viscosity, and β-glucan polymer fine structure in oats were tested. One environment had a severe negative effect on slurry viscosity as evaluated with a rotational viscometer. Environment also had a strong effect on β-glucan extractability, whereas genotype had no significant effect. Fine structure of β-glucan was evaluated from the frequencies of oligosaccharides from lichenase hydrolysis of the β-glucan polymer. Significant differences in degree of polymerization (DP) fragment frequencies were found associated with both genotype and growth environment. The high-β-glucan cultivar HiFi had lower DP3 fragment frequency and higher frequencies of DP4 and DP6 fragments than other cultivars with moderate β-glucan concentration. Drier environments tended to yield lower DP3 fragment frequencies as well. Drier environments and genotypes with more β-glucan synthetic potential may have provided cellular environments with more competition for substrate for β-glucan synthesis, which appeared associated with lower DP3 fragment frequency. In a separate experiment, we found that extractable β-glucan had higher frequencies of DP3 fragments and lower frequency of DP4 fragments. The observed variations deserve consideration for influence on functional properties, such as viscosity or health benefit potential.
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ArticleCopyright
This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. AACC International, Inc., 2012.