Temperature-dependent diffusion coefficient of oil from different sunflower seeds during extraction with hexane

Pérez, Ethel; Carelli, Amalia A.; Crapiste, Guillermo Hector

doi:10.1016/j.jfoodeng.2011.02.025

Cited by 119 publications

(116 citation statements)

References 14 publications

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“…Measurement of molecular diffusion using pulsed field gradient (PFG) NMR is a way to extract the microstructural information (19). Diffusion of large molecules, such as lipids or triglycerides, in adipose tissue is influenced by several factors, including molecular weight, temperature, lipid droplet size, and chemical composition (20)(21)(22)(23)(24). Recently, the diffusion properties of intramyocellular (IMCL) and extramyocellular lipids in the skeletal muscle of rodents (25) and humans (26) have been investigated, and restricted diffusion has been observed in IMCL.…”

Section: Nmr Data Acquisition and Analysismentioning

confidence: 99%

Differentiating brown and white adipose tissues by high-resolution diffusion NMR spectroscopy

Verma

Nagashima

Yaligar

et al. 2017

Journal of Lipid Research

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majority of body fat, which is utilized for energy storage, whereas BAT is a minor portion that is involved in thermogenesis, due to the presence of uncoupling protein 1 (UCP1) in the mitochondria. In addition to the differences in energy storage and expenditure, BAT is a highly heterogeneous, densely vascularized tissue with abundant oxygen, blood supply, and iron-rich mitochondria (6, 7). WAT is composed of unilocular lipid droplets, whereas BAT is composed of multilocular lipid droplets scattered throughout the cytoplasm and surrounded by mitochondria.Positron emission tomography (PET) has been the gold standard for imaging BAT (8, 9) because of a selective image contrast of activated BAT by the increased uptake of 18 F-deoxyglucose. However, PET is not suitable for longitudinal studies because it requires injection of exogenous radioactive tracers. Magnetic resonance (MR)-based methods are more promising for real-time and long-term observation of fat accumulation and consumption (10). Traditional MR-based approaches exploit the differences in the water content in WAT and BAT using chemical shift imaging or the Dixon technique (11-13). Imaging of water and fat permits quantitative assessment of the fat fraction. Additionally, the differences in iron content, perfusion, and vasculature have been exploited by T 2 and T 2 * relaxation techniques (14, 15). However, although WAT and BAT are manually separable by color and texture, they cannot be easily distinguished by MR because of the similarity in their magnetic and chemical characteristics (14,15).Applications of nontraditional MR methodologies for selectively detecting BAT have been attempted. Branca and Warren (16, 17) have studied focusing on intermolecular multiple-quantum coherences through dipolar Abstract There are two types of fat tissues, white adipose tissue (WAT) and brown adipose tissue (BAT), which essentially perform opposite functions in whole body energy metabolism. There is a large interest in identifying novel biophysical properties of WAT and BAT by a quantitative and easy-to-run technique. In this work, we used high-resolution pulsed field gradient diffusion NMR spectroscopy to study the apparent diffusion coefficient (ADC) of fat molecules in rat BAT and WAT samples. The ADC of fat in BAT and WAT from rats fed with a chow diet was compared with that of rats fed with a high-fat diet to monitor how the diffusion properties change due to obesity-associated parameters such as lipid droplet size, fatty acid chain length, and saturation. Feeding a high-fat diet resulted in increased saturation, increased chain lengths, and reduced ADC of fat in WAT. The ADC of fat was lower in BAT relative to WAT in rats fed both chow and high-fat diets. Diffusion of fat was restricted in BAT due to the presence of small multilocular lipid droplets. Our findings indicate that in vivo diffusion might be a potential way for better delineation of BAT and WAT in both lean and obese states.-Verma, S. K., K. Nagashima, J. Yaligar, N. Michael, S. S. Lee, T. Xianfeng, V...

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Section: Nmr Data Acquisition and Analysismentioning

confidence: 99%

Differentiating brown and white adipose tissues by high-resolution diffusion NMR spectroscopy

Verma

Nagashima

Yaligar

et al. 2017

Journal of Lipid Research

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“…Technical grade n-hexane was used at a 1:10 meal-to-solvent ratio (wt/vol) (Pérez et al, 2011). The ground sample and solvent were heated separately using a water bath to the extraction temperature before each test, and the temperature was checked with a thermocouple.…”

Section: Rate Of Oil Extractionmentioning

confidence: 99%

“…Assays were carried out at different times (from 600 to 64800 s) until equilibrium was reached. The amount of oil obtained at 64800 s was identified as M ∞ (mass of solute that diffuses at infinite time) because this time was considered to be long enough to attain the equilibrium state (Pérez et al, 2011).…”

Section: Rate Of Oil Extractionmentioning

confidence: 99%

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Comparison of safflower oil extraction kinetics under two characteristic moisture conditions: statistical analysis of non-linear model parameters

Baümler

Fernández²,

Nolasco³

et al. 2014

Braz. J. Chem. Eng.

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-In this study the kinetics of oil extraction from partially dehulled safflower seeds under two moisture conditions (7 and 9% dry basis) was investigated. The extraction assays were performed using a stirred batch system, thermostated at 50 °C, using n-hexane as solvent. The data obtained were fitted to a modified diffusion model in order to represent the extraction kinetics. The model took into account a washing and a diffusive step. Fitting parameters were compared statistically for both moisture conditions. The oil yield increased with the extraction time in both cases, although the oil was released at different rates. A comparison of the parameters showed that both the portion extracted in the washing phase and the effective diffusion coefficient were moisture-dependent. The effective diffusivities were 2.81 10 -12 and 8.06 10 -13 m 2 s -1 for moisture contents of 7% and 9%, respectively.

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“…Nolasco, 2010, Perez et al, 2011).For obtaining high oil yield and good oil quality, the well process design is necessary. The physical properties of grain and the diffusivity are two major factors in solvent extraction process (Perez et al, 2011). During process, that includes dehulling, grinding, oil extraction, solvent recovery, oil degumming.…”

Section: Introductionmentioning

confidence: 99%

Techno-Economic Modeling of Soybean Oil Extraction with Hexane from 1980 to 2014

Rosentrater¹

2015

2015 ASABE International Meeting

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Temperature-dependent diffusion coefficient of oil from different sunflower seeds during extraction with hexane

Cited by 119 publications

References 14 publications

Differentiating brown and white adipose tissues by high-resolution diffusion NMR spectroscopy

Differentiating brown and white adipose tissues by high-resolution diffusion NMR spectroscopy

Comparison of safflower oil extraction kinetics under two characteristic moisture conditions: statistical analysis of non-linear model parameters

Techno-Economic Modeling of Soybean Oil Extraction with Hexane from 1980 to 2014

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