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Sedimentation Field Flow Fractionation Combined with Multi Angle Laser Light Scattering Applied for Characterization of Starch Polymers
Author(s) -
Hanselmann R.,
Ehrat M.,
Widmer H. M.
Publication year - 1995
Publication title -
starch ‐ stärke
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.62
H-Index - 82
eISSN - 1521-379X
pISSN - 0038-9056
DOI - 10.1002/star.19950470905
Subject(s) - radius of gyration , fractionation , field flow fractionation , starch , molar mass distribution , polymer , multiangle light scattering , radius , dissolution , sedimentation , materials science , light scattering , scattering , analytical chemistry (journal) , characterization (materials science) , chemistry , chromatography , optics , physics , nanotechnology , composite material , organic chemistry , paleontology , computer security , sediment , computer science , biology
Sedimentation Field Flow Fractionation in combination with multi angle laser light scattering was applied to fully destructured potato and waxy corn starches to investigate the molecular weight and radius distributions of the starch components. In a range of radii betwen 50 and 500nm, information could be obtained about the influence of the medium conditions on the distributions. The averages of molecular weight and particle radius were found to decrease when holding the solution at a given temperature for an extended period of time (from 20min up to 60min) and when the temperature was increased (from 160°C up to 175°C). The molecular weight and radii of gyration of the dissolved starch species typically panged from 10 6 to 10 9 daltons and 50nm‐500nm respectively. Changes in the distributions due to different conditions during the dissolution process where also recognized by changes in the shape of the distribution curve. Thus the applied technique gave satisfactory results in a high molecular weight region where SEC fails.