Study of the State of Water and Oil in Frozen Emulsions Using Time Domain NMR

Botlan, D. Le; Wennington, J.; Cheftel, J. C.

doi:10.1006/jcis.2000.6785

Cited by 19 publications

(8 citation statements)

References 20 publications

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“…However, a third phase of water tightly bound to the macromolecules was not seen until an ILT of the relaxation data was applied by using CONTIN, which was not limited by the two component restriction of a bi‐exponential analysis. The work of Le Botlan et al was able to distinguish the phases present in a 49 : 51 water‐in‐oil and a 18 : 82 oil‐in‐water mixture at −13 °C. The T 2 relaxation values obtained from an ILT showed water to be about 99% solid in both mixtures.…”

Section: Introductionsupporting

confidence: 82%

¹H NMR study of the phase behavior of aqueous eutectic solutions using the inverse Laplace transform analysis of T₂ relaxation

Baughman

Ray

Christina

et al. 2017

Magnetic Reson in Chemistry

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High-field H NMR T relaxation studies were used to characterize the changes in the physical phases of water, NaCl, and dextrose solutions over a temperature range of -65 to 15 °C. The data were analyzed with the inverse Laplace transform and with a linear fit to the logarithm of the time domain signal. Two liquid phases were detected for the NaCl and dextrose solutions at lower temperatures and assigned to low and high concentrated solution domains. The high concentrated solution domain was found to be present between -30 and -5 °C in the NaCl solution and between -55 and -5 °C in the dextrose solution. Copyright © 2017 John Wiley & Sons, Ltd.

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Section: Introductionsupporting

confidence: 82%

¹H NMR study of the phase behavior of aqueous eutectic solutions using the inverse Laplace transform analysis of T₂ relaxation

Baughman

Ray

Christina

et al. 2017

Magnetic Reson in Chemistry

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“…Nuclear magnetic resonance (NMR) relaxometry is a convenient and nondestructive analytical method that is successfully used for microstructural analysis. NMR relaxometry provides an advantage to evaluate particle size, [25,26] mobility [27,28] and arrangement of oil molecules [29] within emulsion systems. During NMR measurements, the sample is exposed to a static magnetic field and series of radiofrequency pulses cause movement of hydrogen nuclei.…”

Section: Introductionmentioning

confidence: 99%

Capsaicin emulsions: Formulation and characterization

Akbaş

Soyler

2016

Journal of Dispersion Science and Technology

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Oleoresin capsicum, the oil extract of chili pepper, is mainly composed of capsaicin. Capsaicin is a hydrophobic volatile compound exhibiting antimicrobial activity against various microorganisms. Capsaicin in the form of an emulsion-based carrier system could be a good alternative to enhance bioavailability and simultaneously to increase the shelf-life of food. In this study, capsaicin emulsions were formulated using three different surfactants (Tween 80, commercial soy lecithin, and sucrose monopalmitate/SMP). Effects of aqueous phase composition, pH, and heating the pre-homogenized dispersion were investigated. For characterization, NMR relaxometry, color, turbidity, and antioxidant activity experiments were conducted. Antimicrobial efficacies of the emulsions were also evaluated against Escherichia coli andStaphylococcus aureus. Mean particle sizes of emulsions with surfactants Tween 80, lecithin, and SMP were found to be 68.30, 582.63, and 50.10 nm, respectively. Lecithin-containing emulsions showed the highest antimicrobial activity against S. aureus with 4.60 log reduction, whereas the same effect was observed in Tween 80-containing emulsions against E. coli with 3.86 log reduction. Emulsions prepared with SMP showed the highest antioxidant activity with 0.482 mg DPPH/L emulsion. The formulated emulsions have the potential to be used in food industry as antimicrobial food grade solutions.

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“…Following the work of Le Botlan et al, Gaussian curves (Equation ) are used to fit to both the liquid oil and the solid fat signal. The first part of Equation represents the FID‐signal of the solids, whereas the second decay function is specific for the liquid oil signal.…”

Section: Methodsmentioning

confidence: 99%

Influence of Polymorphism on the Solid Fat Content Determined by FID Deconvolution

Declerck

Nelis

Rimaux³

et al. 2017

Euro J Lipid Sci & Tech

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One of the most important quality parameters of a fat, is its solid fat content (SFC). The standard method to determine the SFC is pNMR using a f‐factor. This factor is determined with three standards. However, this contribution shows that SFC standards are not required when using deconvolution methods. At first, data acquisition is optimized. These experiments revealed that the deconvolution method worked better, if more sample is present in the detection zone of the NMR, due to a higher signal‐to‐noise ratio (SNR). Regarding deconvolution, a bi‐Gaussian model and a model combining a Gaussian and Abragamian function are compared. Both models are able to fit the free induction decay (FID) data. Furthermore, the corresponding SFC values are comparable with the SFC values of the f‐factor method when analyzing SFC standards or fats which are preprocessed using the AOCS tempering protocol. Upon evaluating the influence of the polymorphic states of cocoa butter, it became clear that the f‐factor standards resemble fats containing α‐polymorphs. As a further consequence, the f‐factor method fails when β‐polymorphs are present to a large extent. Overall this study shows that the deconvolution method is superior to the f‐factor method since it does not require any standards and is less affected by the polymorphic state. Practical Applications: This work shows that the solid fat content (SFC) of a fat can be calculated without the use of calibration standards. If deconvolution would replace the standard used pNMR method, it could potentially reduce the preparation time for the measurements, because no calibration is necessary. Next to this, it also lowers the cost of SFC determination, because no standards should be bought. Deconvolution also gives insight in the behavior of the different components present in the sample, for example, T2‐values. There above, research toward deconvolution of pNMR signals is necessary as it could potentially also determine the presence of different fat crystal polymorphs present in samples. One of the most important quality parameters of a fat, is its solid fat content (SFC). The standard method to determine the SFC is pNMR using a f‐factor. However, this contribution shows that SFC standards are not requires when using deconvolution methods. At first, data acquisition is optimized. These experiments revealed that the deconvolution method worked better, if more sample is present in the detection zone of the NMR, due to a higher signal‐to‐noise ratio (SNR). Regarding deconvolution, a bi‐Gaussian model and a model combining a Gaussian and Abragamian function are compared. Both models are able to fit the free induction decay (FID) data.

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Study of the State of Water and Oil in Frozen Emulsions Using Time Domain NMR

Cited by 19 publications

References 20 publications

¹H NMR study of the phase behavior of aqueous eutectic solutions using the inverse Laplace transform analysis of T₂ relaxation

¹H NMR study of the phase behavior of aqueous eutectic solutions using the inverse Laplace transform analysis of T₂ relaxation

Capsaicin emulsions: Formulation and characterization

Influence of Polymorphism on the Solid Fat Content Determined by FID Deconvolution

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Study of the State of Water and Oil in Frozen Emulsions Using Time Domain NMR

Cited by 19 publications

References 20 publications

1H NMR study of the phase behavior of aqueous eutectic solutions using the inverse Laplace transform analysis of T2 relaxation

1H NMR study of the phase behavior of aqueous eutectic solutions using the inverse Laplace transform analysis of T2 relaxation

Capsaicin emulsions: Formulation and characterization

Influence of Polymorphism on the Solid Fat Content Determined by FID Deconvolution

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Product

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¹H NMR study of the phase behavior of aqueous eutectic solutions using the inverse Laplace transform analysis of T₂ relaxation

¹H NMR study of the phase behavior of aqueous eutectic solutions using the inverse Laplace transform analysis of T₂ relaxation