Water mobility and

Bertram H C, Purslow P P and Andersen H J (2002), Relationship between meat structure, water mobility and distribution - A Low-Field NMR study , J Agric Food Chem, 50,... 

Bell et al. (2002) investigated the relationship between water mobility as measured by oxygen-17 NMR (transverse relaxation rate obtained from linewidth at half-height) and chemical stability in glassy and rubbery polyvinylpyrrolidone (PVP) systems. Reported results suggest that water mobility in PVP model systems was not related to Tg. The study did not find a link between water mobility and reaction kinetics data (half-lives) for degradation of aspartame, loss of thiamin and glycine, and stability of invertase. 

Comillon, P. and Salim, L.C. 2000. Charaterization of water mobility and distribution in low- and intermediate-moisture food systems. Magn. Reson. Imag. 18, 335-341. 

Abstract We use Nuclear Magnetic Resonance relaxometry (i.e. the frequency variation of the NMR relaxation rates) of quadrupolar nucleus ( Na) and H Pulsed Gradient Spin Echo NMR to determine the mobility of the counterions and the water molecules within aqueous dispersions of clays. The local ordering of isotropic dilute clay dispersions is investigated by NMR relaxometry. In contrast, the NMR spectra of the quadrupolar nucleus and the anisotropy of the water self-diffusion tensor clearly exhibit the occurrence of nematic ordering in dense aqueous dispersions. Multi-scale numerical models exploiting molecular orbital quantum calculations, Grand Canonical Monte Carlo simulations, Molecular and Brownian Dynamics are used to interpret the measured water mobility and the ionic quadrupolar relaxation measurements. 

OSR may be used in structure of oil-sweeping liquids. Injection of polymers water solutions into heterogeneity layers provides oil recovery at the expense of increase of coefficients of layer coverage as a result of decrease of ratio of water mobility and displaced oil. At present for oil displacement from layers carboxymethylcellulose (CMC) are the most widely used. However, wide application of CMC in oil-production industry is limited by limited volumes of its production and high cost [15], OSR as it was already mentioned was significantly cheaper than CMC and might be obtained from agricultural waste that makes it even more advisable. 

Chinachoti, P., Water mobility and its relation to functionality of sucrose-containing food systems, Food Technol., 47, 134, 1993. 

Rajabi-Siahboomi, A.R., BowteU, R.W., Mansfield, R, Davies, M.C. and Melia, C.D. (1996) Structure and behavior in hydrophUic matrix sustained release dosage forms 4. Studies of water mobility and diffusion coefficients in the gel layer of HPMC tablets using NMR imaging. Pharm Res, 13, 376-380. 

NMR as a moisture-sensing method still remains important and new devices are being developed,64 as are new multivariate statistical approaches to data analysis.65 NMR has been used to relate the hardness of cooked rice66 and starch-based products67 to water mobility and to understand more about the freezing process.3668... 

Starch hydration, water mobility, and the effect of chemical modification on molecular mobility of starch have also been studied using LR NMR. 

NMR has become a powerful tool in meat science. Especially the use of proton NMR relaxation measurement has experienced considerable success in meat science because of its potential for characterising water mobility and compartmentalisation. Recently, investigations combining proton NMR relaxation with other techniques have explored additional unique relationships between water characteristics and specific biophysical and structural features of the meat. This chapter aims at unfolding present status of proton NMR relaxation applications in meat science with focus on latest studies combining proton NMR relaxation with spectroscopic, microscopic and sensory measurements. 

Peschier, L. J. C., Bouwstra, J. A., de Bleyser, J., Junginger, H. E., and Le5de, J. C., 1993, Water mobility and structure in poly[2-hydroxyethylmethacrylate] hydrogels by means of the pulsed field gradient NMR technique. Biomaterials 14 945-952. 

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