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J Dent Res 54(2): 290-297, 1975
© 1975 International and American Associations for Dental Research
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Levans: I. Fractionation, Solution Viscosity, and Chemical Analysis of Levan Produced by Streptococcus salivarius

J. EHRLICH 1, S. S. STIVALA 1, W. S. BAHARY 1, S. K. GARG 1, L. W. LONG 1, and E. NEWBRUN 1

1 Department of Chemistry and Chemical Engineering, Stevens Institute of Technology, Hoboken, New Jersey 07030, USA, and School of Dentistry, University of California, San Francisco, California 94122

Levan produced by Streptococcus salivarius was fractionated into a series of 20 fractions of varying molecular weight. The range of intrinsic viscosities of the fractions was 0.07 to 0.18 dl/gm in water and 0.20 to 0.29 dl/gm in dimethyl sulfoxide. The molecular weight of the unfractionated levan determined by light scattering was 31.5 x 106 Small amounts of fatty acids and protein were found associated with levan.

Submitted on April 15, 1974
Accepted on September 24, 1974




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