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@ARTICLE{Banc:821016,
author = {Banc, A. and Charbonneau, C. and Dahesh, M. and Appavou,
M.-S. and Fu, Z. and Morel, M.-H. and Ramos, L.},
title = {{S}mall angle neutron scattering contrast variation reveals
heterogeneities of interactions in protein gels},
journal = {Soft matter},
volume = {12},
number = {24},
issn = {1744-6848},
address = {London},
publisher = {Royal Soc. of Chemistry},
reportid = {FZJ-2016-06273},
pages = {5340 - 5352},
year = {2016},
abstract = {We propose a quantitative approach to probe the spatial
heterogeneities of interactions in macromolecular gels,
based on a combination of small angle X-ray (SAXS) and
neutrons (SANS) scattering. We investigate the structure of
model gluten protein gels and show that the gels display
radically different SAXS and SANS profiles when the solvent
is (at least partially) deuterated. The detailed analysis of
the SANS signal as a function of the solvent deuteration
demonstrates heterogeneities of sample deuteration at
different length scales. The progressive exchange between
the protons (H) of the proteins and the deuteriums (D) of
the solvent is inhomogeneous and 60 nm large zones that are
enriched in H are evidenced. In addition, at low protein
concentration, in the sol state, solvent deuteration induces
a liquid/liquid phase separation. Complementary biochemical
and structure analyses show that the denser protein phase is
more protonated and specifically enriched in glutenin, the
polymeric fraction of gluten proteins. These findings
suggest that the presence of H-rich zones in gluten gels
would arise from the preferential interaction of glutenin
polymers through a tight network of non-exchangeable
intermolecular hydrogen bonds.},
cin = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
(München) ; JCNS-FRM-II / Neutronenstreuung ; JCNS-1},
ddc = {530},
cid = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
I:(DE-Juel1)JCNS-1-20110106},
pnm = {6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich Centre for
Neutron Research (JCNS) (POF3-623) / NMI3-II - Neutron
Scattering and Muon Spectroscopy Integrated Initiative
(283883)},
pid = {G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4 /
G:(EU-Grant)283883},
experiment = {EXP:(DE-MLZ)KWS1-20140101 / EXP:(DE-MLZ)KWS3-20140101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000378934400011},
pubmed = {pmid:27198847},
doi = {10.1039/C6SM00710D},
url = {https://juser.fz-juelich.de/record/821016},
}