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Physicochemical parameters of partially hydrolyzed S. salivarius levan fractions
Author(s) -
Stivala S. S.,
Zweig J. E.
Publication year - 1981
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/bip.1981.360200311
Subject(s) - chemistry , radius of gyration , spheres , sedimentation , viscosity , intrinsic viscosity , hydrolysis , sedimentation coefficient , analytical chemistry (journal) , logarithm , chromatography , crystallography , thermodynamics , polymer , physics , organic chemistry , mathematical analysis , paleontology , mathematics , astronomy , sediment , biology , enzyme
The fractions obtained from the partially hydrolyzed branched Streptococcus salivarius levan were examined in solution. Sedimentation coefficients, S 0 , intrinsic viscosities, [η], weight‐average molecular weights, M w , and radii of gyration were obtained from sedimentation velocity, viscosity, and light‐scattering measurements. Double logarithmic plots of [η] vs M w and S 0 vs M w each yielded two linear segments intersecting at M w ≈ 10 5 . Hydrodynamic data suggest that fractions of M w > 10 5 behave as compact spheres, whereas for M w < 10 5 , the particles are best characterized as linear random coils. Calculations based on theories of random coils and spheres support the above observations.