Journal ArticleDOI
1H NMR spectroscopy of polymers under shear and extensional flow
Paul T. Callaghan,Ana M. Gil +1 more
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In this paper, the potential insights gained from 1H nuclear magnetic resonance (NMR) spectroscopy experiments on polymeric systems under both shear and extension were discussed, and it was shown that 1H spin-spin relaxation is sensitive to both molecular conformation and to molecular interactions.Abstract:
We discuss the potential insights gained from 1H nuclear magnetic resonance (NMR) spectroscopy experiments on polymeric systems under both shear and extension, and we show in particular that 1H spin-spin relaxation is sensitive to both molecular conformation and to molecular interactions. Rheo-NMR 1H spectroscopy studies on semi-dilute solutions of polyacrylamide demonstrate that the chain protons exhibit a marked T2 reduction under shear and that the recovery on shear cessation is indicative of slow reorganisational dynamics. Studies of the wheat flour protein, gluten, indicate marked spectroscopic changes in the vicinity of the amidic resonances associated with glutamine residues, an effect we attribute to the disruption of hydrogen bonding.read more
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Journal ArticleDOI
Changes in Protein Secondary Structure during Gluten Deformation Studied by Dynamic Fourier Transform Infrared Spectroscopy
Nikolaus Wellner,E. N. Clare Mills,Geoff Brownsey,Reginald H Wilson,Neil Andrew Brown,J. Freeman,Nigel G. Halford,Peter R. Shewry,Peter S. Belton +8 more
TL;DR: The relationship between gluten structure and mechanical properties is discussed in terms of a model in which conversion of beta-turn to beta-sheet structure is a response to extension and a means by which elastic energy is stored in the system.
Journal ArticleDOI
New approaches to study the molecular basis of the mechanical properties of gluten
TL;DR: In this article, the behavior of gluten and dough on mixing is characterised by the build-up of a polymeric species and that particulate theories of dough rheology are not tenable.
Journal ArticleDOI
Time-dependent rheology of colloidal star glasses
TL;DR: Yield stress is linked to shear banding in this class of soft colloids through an evolution from a monotonic slightly shear-thinning flow curve to a flow curve dominated by a stress plateau.
Journal ArticleDOI
Characterisation of dairy emulsions by NMR and rheological techniques
Domenico Gabriele,Massimo Migliori,Rosa Di Sanzo,Cesare Oliviero Rossi,Silvestro Antonio Ruffolo,Bruno de Cindio +5 more
TL;DR: In this paper, rheological and NMR analyses were performed to evaluate material properties as well as droplet size distribution and possible flow-induced alteration of dairy emulsions, based on milk, vegetable fats, a mixture of sugars, emulsifiers (hydrophilic or lipophilic) and natural stabilizers (carrageenan and guar gum).
Book ChapterDOI
Applications of NMR to food science
TL;DR: This report reviews the literature on the applications of NMR to food science from 1995 until March 2001 and covers water in foods, biopolymers, analysis and authentication, complex systems, and new methods for food analysis.
References
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Book
The theory of polymer dynamics
Masao Doi,Sam F. Edwards +1 more
TL;DR: In this article, the viscoelasticity of polymeric liquids was studied in the context of rigid rod-like polymers and concentrated solutions of rigid rods like polymers.
Book
Principles of Nuclear Magnetic Resonance Microscopy
TL;DR: In this paper, the authors introduce the principles of imaging for nuclear magnetic resonance and describe the influence of magnetic field gradients on the magnetic field. But they do not discuss the application of magnetic resonance in biology and minerals science.
Journal ArticleDOI
Shear banding instability in wormlike micellar solutions
TL;DR: It is argued that the slow migrations of the wormlike micelle system are governed by stress relaxation effects while the rapid migrations are flow driven and arise from interfacial instability.
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