Quantitative Determination of Water and Lipid in Sunflower Oil and Water/Meat/Fat Emulsions by Nuclear Magnetic Resonance Imaging

Duce, Suzanne L.; Ablett, S.; Guihéneuf, Thierry M.; Horsfield, Mark A.; Hall, Laurance D.

doi:10.1111/j.1365-2621.1994.tb08133.x

Cited by 17 publications

(6 citation statements)

References 24 publications

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“…Reported studies making use of the chemical shift contrast then often deal with emulsions that are contained in a simple beaker, or even a cylindrical pipe displayed parallel to B o . Quite early results deal with the use of chemical shift imaging (CSI) for a quantitative assessment of oil/fat content in food emulsions [32], or the separation of oil and water components of an emulsion during a filtration process [33]. More recently, Götz and Zick [31] and Hollingsworth and Johns [17] managed to carry out quite well resolved local measurements of water/oil concentrations and/or velocities in model suspensions flowing through a pipe in a laminar regime.…”

Section: Concentration Measurementsmentioning

confidence: 99%

Wide-gap Couette flows of dense emulsions: Local concentration measurements, and comparison between macroscopic and local constitutive law measurements through magnetic resonance imaging

et al. 2008

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Flows of dense emulsions show many complex features among which long range nonlocal effects pose problem for macroscopic characterization. In order to get round this problem, we study the flows of several dense emulsions, with droplet size ranging from 0.3 to 40µm, in a wide gap Couette geometry. We couple macroscopic rheometric experiments and local velocity measurements through MRI techniques. As concentration heterogeneities are expected in the wide gap Couette flows of multiphase materials, we also designed a new method to measure the local droplet concentration in emulsions with a MRI device. In contrast with dense suspensions of rigid particles where very fast migration occurs under shear in wide gap Couette flows, we show for the first time that no migration takes place in dense emulsions even for strain as large as 100000 in our systems. As a result of the absence of migration and of finite size effect, we are able to determine very precisely the local rheological behavior of several dense emulsions. As the materials are homogeneous, this behavior can also be inferred from purely macroscopic measurements. We thus suggest that properly analyzed purely macroscopic measurements in a wide gap Couette geometry can be used as a tool to study the local constitutive laws of dense emulsions. All behaviors are basically consistent with Herschel-Bulkley laws of index 0.5. The existence of a constitutive law accounting for all flows contrasts with previous results obtained within a microchannel by Goyon et al. [Nature 454, 84 (2008)]: the use of a wide gap Couette geometry is likely to prevent here from nonlocal finite size effects; it also contrasts with the observations of Bécu et al. [Phys. Rev. Lett. 96, 138302 (2006)].We also evidence the existence of discrepancies between a perfect Herschel-Bulkley behavior and the observed local behavior at the approach of the yield stress due to slow shear flows below the apparent yield stress in the case of a strongly adhesive emulsion.

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Section: Concentration Measurementsmentioning

confidence: 99%

Wide-gap Couette flows of dense emulsions: Local concentration measurements, and comparison between macroscopic and local constitutive law measurements through magnetic resonance imaging

et al. 2008

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“…Aussi est-il nécessaire de vérifier au préalable les valeurs des temps de relaxation de l'eau pour définir les conditions d'acquisition IRM, en particulier le temps d'écho, afin d'éviter des erreurs dans l'estimation de la teneur en eau. D'une façon générale, cette démarche n'est possible que pour des produits maigres ou avec très peu de matière grasse ; dans le cas contraire, les méthodes basées sur la mesure des dépla-cements chimiques seront plus adaptées [22,23].…”

Section: La Densité Protoniqueunclassified

Relaxation RMN et IRM : un couplage indispensable pour l'étude des produits alimentaires

Mariette¹

2004

Comptes Rendus. Chimie

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“…Magnetic Resonance Imaging (MRI), which is already extensively used in medicine (Morris, 1986), shows signs of becoming a versatile, non-invasive analytical technique for studying food properties (Ishida et al, 1989;Duce et al, 1992;Beauvallet & Renou, 1992). However, although 'bench-top' Nuclear Magnetic Resonance (NMR) spectrometers have been used for decades by meat scientists (Casey & Miles, 1974), the utility of MRI for determining the distribution of water and fat in meat has only been demonstrated recently (Beauvallet & Renou, 1992;Duce et al, 1994). Recently too, two-dimensional 2'Na MRI has been used to study qualitatively the spatial distribution of brine in cured meat (Renou et al, 1994).…”

Section: Introductionmentioning

confidence: 99%

Use of magnetic resonance imaging to study the binding of manganese ions in brine‐cured pork

Guihéneuf

Duce

Gibbs

et al. 1995

Int J of Food Sci Tech

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Saturation recovery Magnetic Resonance Imaging (MRI) has been used to study the dependence of the water proton NMR longitudinal relaxation rate (T,-I) on Mn2+ concentration in pork which had been cured with 53, 102, and 193 mg g-' NaCl solutions. Those data are discussed in the context of meat swelling, determined independently by gravimetric water uptake. The utility of manganese ions as a paramagnetic tracer to probe the ability of brined pork to bind Mn2+ ions was further demonstrated in a two-dimensional inter-diffusion experiment which visualized perfusion of a given manganese ion concentration through a cylindrical sample of 102 mg g-' NaCl cured pork.

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Quantitative Determination of Water and Lipid in Sunflower Oil and Water/Meat/Fat Emulsions by Nuclear Magnetic Resonance Imaging

Cited by 17 publications

References 24 publications

Wide-gap Couette flows of dense emulsions: Local concentration measurements, and comparison between macroscopic and local constitutive law measurements through magnetic resonance imaging

Wide-gap Couette flows of dense emulsions: Local concentration measurements, and comparison between macroscopic and local constitutive law measurements through magnetic resonance imaging

Relaxation RMN et IRM : un couplage indispensable pour l'étude des produits alimentaires

Use of magnetic resonance imaging to study the binding of manganese ions in brine‐cured pork

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