Linkage Structure Analysis of Barley and Oat $\beta$-Glucans by High Performance Anion Exchange Chromatography

  • Ryu, Je-Hoon (Department of Food Science and Technology and Carbohydrate Bioproduct Research Center, Sejong University) ;
  • Yoo, Dong-Hyung (Department of Food Science and Technology and Carbohydrate Bioproduct Research Center, Sejong University) ;
  • Lee, Byung-Hoo (Department of Food Science and Technology and Carbohydrate Bioproduct Research Center, Sejong University) ;
  • Lee, Su-Yong (Department of Food Science and Technology and Carbohydrate Bioproduct Research Center, Sejong University) ;
  • Joo, Mi-Hyun (Department of Food Science and Technology and Carbohydrate Bioproduct Research Center, Sejong University) ;
  • Yoo, Sang-Ho (Department of Food Science and Technology and Carbohydrate Bioproduct Research Center, Sejong University)
  • Published : 2009.02.28

Abstract

Cereal $\beta$-glucans, linked essentially by mixed $\beta$-(1,4/1,3) glycosidic bonds, were extracted, purified, and structurally identified. Previously chemical structure of barley $\beta$-glucans was characterized from 3 varieties of 'Gang', 'Ohl', and 'Gwangan', and the (1,4)/(1,3) linkage ratio of the $\beta$-glucans was identical. In this study, $\beta$-glucans from 1 barley ('Chal') and 3 oat ('Ohl', 'Samhan', and 'Donghan') varieties were structurally scrutinized, and the linkage pattern of total 7 cereal $\beta$-glucans was compared. The amount of 2 major 3-O-$\beta$-cellobiosyl-D-glucose (DP3) and 3-O-$\beta$-cellotriosyl-D-glucose (DP4) from barley and oat accounted for only 66.6-73.3 and 68.12-81.89% of water-extractable $\beta$-glucan fractions, and the (1,4)/(1,3) linkage ratios of both barley and oat $\beta$-glucans were within very narrow range of 2.27-2.31 and 2.38-2.39, respectively, among the cultivars tested. Structural difference in the cereal $\beta$-glucans was evident when DP3:DP4 ratio in the $\beta$-glucan structure was compared. As a result, this ratio was significantly greater for barley $\beta$-glucan (2.26-2.74) than for oat (1.54-1.66). Chal-B had the greatest DP3 to DP4 ratio among the samples, which in turn reflected the least amount of (1,4)-linkages.

Keywords

References

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