Levans. III. A light-scattering study of Streptococcus salivarius levan in dimethyl sulfoxide

✍ Scribed by W. S. Bahary; S. S. Stivala; E. Newbrun; J. Ehrlich

• Publisher: Wiley (John Wiley & Sons)
• Year: 1975
• Tongue: English
• Weight: 602 KB
• Volume: 14
• Category: Article
• ISSN: 0006-3525
• DOI: 10.1002/bip.1975.360141204

✦ Synopsis

A light-scattering study of unfractionated and five fractions of Streptococcus saliuarius levan was performed in dimethyl sulfoxide. The weight-average molecular weights &ifr, in dimethyl sulfoxide, after adequate dissolution, agree with those obtained in water within a mean difference of 7%. The intrinsic viscosities [a] and root-mean-square z-average radii of gyration (R,2),1/2 are significantly higher in dimethyl sulfoxide thaninwater, reflecting the higher hydrodynamic volume in the former. The &ifr, [a], and (R,2),'/2 of the fractions suggest that levan has a low polydispersity. The exponent of 0.12 of the Mark-Houwink plot and model analysis confirm the branched and compact structure of levan.

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