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Small‐angle neutron scattering of aggregated whey protein colloids with an exocellular polysaccharide
Author(s) -
Tuinier R.,
Holt C.,
Timmins P.A.,
De Kruif K.
Publication year - 2000
Publication title -
journal of applied crystallography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.429
H-Index - 162
ISSN - 1600-5767
DOI - 10.1107/s0021889800099921
Subject(s) - colloid , small angle neutron scattering , scattering , chemistry , neutron scattering , polysaccharide , structure factor , macromolecule , phase (matter) , light scattering , chemical engineering , crystallography , chromatography , materials science , biochemistry , optics , organic chemistry , physics , engineering
We have investigated the scattering properties of mixtures of aggregated‐whey‐protein colloid (AWC) particles and an exocellular polysaccharide (EPS) from a lactic acid bacterium. Exceeding a certain concentration leads to a phase separation, which can be explained by an effective depletion attraction between the AWCs due to non‐adsorbing EPS. The measured scattering intensity of a AWC/EPS mixture shows that the structure factor of the AWC particles increases at low wave vectors with increasing EPS concentration. The measurements can be described qualitatively in terms of the structure factor, calculated using integral theory including an expression for the depletion interaction potential.