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Published in Crop Sci 8:210-212 (1968)
© 1968 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Carbohydrates in Grasses. III. Estimations of the Degree of Polymerization of the Fructosans in the Stem Bases of Timothy and Bromegrass Near Seed Maturity1

R. D. Grotelueschen and Dale Smith2

The degree of polymerization of the fructosans (one glucose plus the number of fructose units per fructosan molecule) in the stem bases of timothy and bromegrass was estimated from extracts obtained with graded ethanol concentrations. Fructosans of increasing size were extracted as the ethanol concentration was decreased. Timothy contained a fructosan with a maximum degree of polymerization near 260 as compared with near 26 for bromegrass.

Key Words: ethanol fractionations • chromatography • nonstructural carbohydrates • reducing sugars

1 Published with approval of the Director of the Wisconsin Agricultural Experiment Station, Madison, 53706.

2 Research Assistant (now Plant Biochemist, Department of Agronomy, Deere & Co., Moline, 111., 61265) and Professor in Agronomy, University of Wisconsin, Madison, Wis. 53706.

Received for publication June 2, 1967.




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