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A combined small‐angle X‐ray and neutron scattering study of the structure of purified soluble gastrointestinal mucins
Author(s) -
Georgiades Pantelis,
di Cola Emanuela,
Heenan Richard K.,
Pudney Paul D. A.,
Thornton David J.,
Waigh Thomas A.
Publication year - 2014
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.22523
Subject(s) - chemistry , small angle neutron scattering , neutron scattering , small angle x ray scattering , mucin , scattering , polymer , persistence length , crystallography , small angle scattering , neutron , polymer chemistry , optics , organic chemistry , nuclear physics , biochemistry , physics
The structures of purified soluble porcine gastric (Muc5ac) and duodenal (Muc2) mucin solutions at neutral and acidic pH were examined using small‐angle X‐ray scattering and small‐angle neutron scattering experiments. We provide evidence for the morphology of the network above the semidilute overlap concentration and above the entanglement concentration. Furthermore, we investigated the gelation of both types of mucin solutions in response to a reduction in pH, where we observed the formation of large‐scale heterogeneities within the polymer solutions, typical of microphase‐separated gels. The concentration dependence of the inhomogeneity length scale (Ξ) and the amplitude of the excess scattering intensity [I ex (0)] are consistent with previously studied gelled synthetic polymeric systems. The persistence lengths of the chains were found to be similar for both Muc5ac and Muc2 from Kratky plots of the neutron data (8 ± 2 nm). © 2014 Wiley Periodicals, Inc. Biopolymers 101: 1154–1164, 2014.