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Michael Laposata - One of the best experts on this subject based on the ideXlab platform.
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Fatty acid Ethyl Esters: Non-oxidative metabolites of ethanol
Prostaglandins Leukotrienes and Essential Fatty Acids, 1995Co-Authors: Michael Laposata, Zbigniew M Szczepiorkowski, J. E. BrownAbstract:Abstract Fatty acid Ethyl Esters are esterification products of fatty acids and ethanol. These compounds have been detected in the serum and cells of individuals following ethanol ingestion. Fatty acid Ethyl Esters can be quantitated by gas chromatography-mass spectroscopy (GC-MS) in the serum following ethanol ingestion and have been found in concentrations up to 42 μM. Fatty acid Ethyl Esters have also been isolated from adipose tissue of subjects ingesting fatty acid Ethyl ester capsules as well as from subjects ingesting ethanol. HepG2 cells, a human hepatoblastoma cell line, have also been shown to generate fatty acid Ethyl Esters when incubated with 1.25 μM fatty acid and 0.17 M ethanol. Fatty acid Ethyl Esters were found to be toxic to HepG2 cells when presented to the cells in the core of low density lipoprotein particles.
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Fatty acid Ethyl Esters are present in human serum after ethanol ingestion
Journal of lipid research, 1994Co-Authors: Kathleen Doyle, David A. Bird, Salih Al-salihi, Youseff Hallaq, Joanne E. Cluette-brown, Kendrick A. Goss, Michael LaposataAbstract:The aim of the study was to determine whether fatty acid Ethyl Esters, nonoxidative products of ethanol metabolism selectively present in organs damaged by ethanol abuse, are de- tectable in the serum after ethanol ingestion. Serum samples of hospital emergency room patients with positive (n = 32) and negative (n = 5) blood ethanol levels were assayed for fatty acid Ethyl Esters. In a separate study, five healthy subjects received an ethanol dose based on body weight mixed with fruit juice in a 1:2 ratio and administered by measured ingestion. Fatty acid Ethyl Esters were found in the serum of hospital emergency room patients with positive blood ethanol levels. The concentration of fatty acid Ethyl Esters in these patients correlated with the con- centration of blood ethanol (7 = 0.57; 95% confidence interval 0.28 to 0.77; P = 0.0002). In the controlled ethanol ingestion study with five healthy subjects, it was also determined that the serum fatty acid Ethyl ester concentration began to decrease wi- thin 2 h of the time ethanol ingestion had been stopped. The fatty acid Ethyl Esters in the serum were bound to lipoprotein and albumin, and there was a higher percentage of saturated fatty acids in the FAEE pool than in the serum free fatty acid and triglyceride pools. These studies indicate that fatty acid Ethyl Esters, which have been implicated as mediators of ethanol- induced organ toxicity, are present in serum after ethanol inges- tion.-Doyle, K. M., D. A. Bird, S. Al-Salihi, Y. Hallaq, J. E. Cluette-Brown, K. A. GOSS, and M. Laposata. Fatty acid Ethyl Esters are present in human serum after ethanol ingestion. J. Lipid Res. 1994. 35: 428-437.
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Fatty acid Ethyl Esters are present in human serum after ethanol ingestion
Journal of lipid research, 1994Co-Authors: Kathleen Doyle, David A. Bird, Salih Al-salihi, Youseff Hallaq, Joanne E. Cluette-brown, Kendrick A. Goss, Michael LaposataAbstract:The aim of the study was to determine whether fatty acid Ethyl Esters, nonoxidative products of ethanol metabolism selectively present in organs damaged by ethanol abuse, are detectable in the serum after ethanol ingestion. Serum samples of hospital emergency room patients with positive (n = 32) and negative (n = 5) blood ethanol levels were assayed for fatty acid Ethyl Esters. In a separate study, five healthy subjects received an ethanol dose based on body weight mixed with fruit juice in a 1:2 ratio and administered by measured ingestion. Fatty acid Ethyl Esters were found in the serum of hospital emergency room patients with positive blood ethanol levels. The concentration of fatty acid Ethyl Esters in these patients correlated with the concentration of blood ethanol (r = 0.57; 95% confidence interval 0.28 to 0.77; P = 0.0002). In the controlled ethanol ingestion study with five healthy subjects, it was also determined that the serum fatty acid Ethyl ester concentration began to decrease within 2 h of the time ethanol ingestion had been stopped. The fatty acid Ethyl Esters in the serum were bound to lipoprotein and albumin, and there was a higher percentage of saturated fatty acids in the FAEE pool than in the serum free fatty acid and triglyceride pools. These studies indicate that fatty acid Ethyl Esters, which have been implicated as mediators of ethanol-induced organ toxicity, are present in serum after ethanol ingestion.
Vladimir J Oliveira - One of the best experts on this subject based on the ideXlab platform.
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continuous production of fatty acid Ethyl Esters from soybean oil in compressed ethanol
Industrial & Engineering Chemistry Research, 2007Co-Authors: Consuelo Yumiko Yoshioka E Silva, Claudio Dariva, Thiago Andre Weschenfelder, Suzimara Rovani, Fernanda C Corazza, Marcos L Corazza, Vladimir J OliveiraAbstract:This work investigates the production of fatty acid Ethyl Esters from soybean oil in sub- and supercritical ethanol. The experiments were performed in a tubular reactor in the temperature range of 473−648 K, from 7 to 20 MPa, adopting the oil-to-ethanol molar ratio interval from 1:10 to 1:100. Results showed that temperature and pressure below the solvent critical point led to very low reaction conversions while appreciable yields were verified around 623 K and 20 MPa using an oil-to-solvent molar ratio of 1:40 and with a reaction time of approximately 15 min. A pseudo-first-order kinetic modeling was employed in representing the experimental alcoholysis data with a satisfactory agreement between experimental and calculated conversion values.
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phase behavior of soybean oil castor oil and their fatty acid Ethyl Esters in carbon dioxide at high pressures
Journal of Supercritical Fluids, 2006Co-Authors: Papa M Ndiaye, Elton Franceschi, Debora De Oliveira, Claudio Dariva, Frederico W Tavares, Vladimir J OliveiraAbstract:Abstract This work provides experimental phase equilibrium data of binary and ternary systems involving carbon dioxide (CO 2 ), ethanol, soybean oil, castor oil and their fatty acid Ethyl Esters. Here the oils and their fatty acid Ethyl Esters were treated as pseudo components. The experiments were carried out in a high-pressure variable-volume view cell in the temperature range of 13–70 °C, for carbon dioxide overall composition ranging from 5 to 45 wt.% and pressures up to 270 bar. The Peng–Robinson and statistical associating fluid theory (SAFT) equations of state were used to represent the experimental data, and results show that for fatty acid Esters both models provide satisfactory representation of experimental data, while for the vegetable oils the SAFT demonstrated superior performance compared to the Peng–Robinson equations of state (EoS).
Cara E. Schwarz - One of the best experts on this subject based on the ideXlab platform.
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High Pressure Phase Equilibria of the CO2/Saturated Ethyl Esters Homologous Series
Journal of Chemical & Engineering Data, 2018Co-Authors: Cara E. SchwarzAbstract:A systematic study on the phase behavior of saturated Ethyl Esters with supercritical CO2 is presented. High pressure phase behavior measurements for the systems CO2/Ethyl decanoate, CO2/Ethyl dodecanoate, CO2/Ethyl tetradecanoate, and CO2/Ethyl hexadecanoate were conducted in a static synthetic view cell in the temperature range 308–358 K. Phase transition pressures were measured in the range 5.86–23.01 MPa for Ethyl ester mass fractions in the range 0.0174–0.657 and complement existing literature data. Throughout the temperature and compositional range measured, which encompassed the liquid phase, mixture critical region, and vapor phase, an increase in temperature leads to an increase in phase transition pressure with no temperature inversions or three phase regions observed. Additionally, an increase in hydrocarbon backbone length leads to an ever-increasing phase-transition pressure, suggesting fractionation of Ethyl Esters according to molecular mass with supercritical CO2 is possible. Finally, the ...
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High pressure phase equilibria of Ethyl Esters in supercritical ethane and propane
The Journal of Supercritical Fluids, 2013Co-Authors: Cara E. Schwarz, C. Schlechter, Johannes H. KnoetzeAbstract:Abstract The high pressure phase equilibria of Ethyl Esters (Ethyl decanoate/caprate, Ethyl dodecanoate/laurate, Ethyl tetradecanoate/myristate and Ethyl hexadecanoate/palmitate) in supercritical ethane and propane have been measured in the temperature ranges 311–358 K (TR = 1.02–1.17) and 376–409 K (TR = 1.02–1.11), respectively. The measurements were conducted in a high pressure view cell for Ethyl ester mass fractions between 0.015 and 0.65. The results show a generally linear relationship between the phase transition temperature and pressure. No temperature inversions or three phase regions were observed. An increase in hydrocarbon backbone length leads to an increase in phase transition pressure. For ethane as supercritical solvent, this increase is linear. For propane as supercritical solvent, the nature of the increase was not quantified as the magnitude of the increase would be significantly influenced by the experimental measurement error as the observed increase is not very large. Comparison of the phase behaviour of Ethyl Esters with mEthyl Esters shows very little difference, yet the phase transition pressure of Ethyl Esters in supercritical ethane and propane is significantly lower than those of the corresponding acids. The phase transition pressure of Ethyl Esters in ethane and propane is also lower than those in carbon dioxide.
Edesio Luiz Simionatto - One of the best experts on this subject based on the ideXlab platform.
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chemical composition and thermal properties of mEthyl and Ethyl Esters prepared from aleurites moluccanus l willd euphorbiaceae nut oil
Industrial Crops and Products, 2016Co-Authors: Marcia Regina Pereira Cabral, Silvanice Aparecida Lopes Dos Santos, Jusinei Meireles Stropa, Rogerio Cesar De Lara Da Silva, Claudia Andrea Lima Cardoso, Lincoln Carlos Silva De Oliveira, Dilamara Riva Scharf, Edesio Luiz Simionatto, Etenaldo F SantiagoAbstract:Abstract In this work, the Aleurites moluccanus oil was obtained in high yield from the almonds (42%). The mEthyl and Ethyl Esters obtained by transesterification of the oil, have a high content of fatty acid unsaturated Esters (>89%). Thermal properties in inert and oxidative atmospheres of oils and Esters of A. moluccanus seed oil were estimated using Thermogravimetry − Derivative Thermogravimetry (TG/DTG). Low temperature properties of the mEthyl and Ethyl Esters were investigated using Differential Scanning Calorimetry (DSC). From the experiments was found that A. moluccanus seeds oil was thermally stable up to 210.9 °C; the methanol biodiesel is stable up to 117.9 °C and the ethanol biodiesel is up to 122.0 °C in air. In nitrogen atmosphere the A. moluccanus seeds oil was thermally stable up to 291.2 °C; the methanol biodiesel up to 119.0 °C and the ethanol biodiesel up to 123.3 °C. The Esters have satisfactory performance at low temperatures with respect to the point of crystallization, which were below −11 °C. The results showed that A. moluccanus found in Brazil can contribute as a non-edible raw material for the production of biodiesel.
Eduardo A C Batista - One of the best experts on this subject based on the ideXlab platform.
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liquid liquid equilibrium data for systems important in biodiesel production involving vegetable oils Ethyl Esters monoacylglycerols and diacylglycerols anhydrous ethanol at 303 15 and 318 15 k
Fuel, 2016Co-Authors: Simone Shiozawa, Antonio J. A. Meirelles, Eduardo A C BatistaAbstract:Abstract In biodiesel production from vegetable oils, mono- and diacylglycerols are intermediate compounds of transesterification reaction of triacylglycerols with short chain alcohols, and may contaminate the final product, when the fatty ester conversion is not complete. Thus, this study aims to determine the liquid–liquid equilibrium data of systems important to biodiesel production, containing triacylglycerols (TAG) of refined oils (soybean, cottonseed and rice bran) + commercial mixture of fatty acid Ethyl Esters (linoleate and oleate) + diacylglycerols (DAG) + monoacylglycerols (MAG) of commercial mixture of partial acylglycerols + anhydrous ethanol at (303.15 and 318.15 K). The High Performance Size Exclusion Chromatography (HPSEC) method was used for quantification of all components: TAG, DAG, MAG, fatty acid Ethyl Esters and ethanol in both phases in equilibrium. The preference of fatty acid Ethyl Esters and DAG for the oil phase is consistent with the reported data in literature. The mass fraction of MAG was greater in the solvent phase. The average deviation between experimental and calculated compositions, using NRTL model, was less than 0.60%. Using the original version of UNIFAC model with two different set of parameters, the deviations varied within the range of (4.25–11.45)%.
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densities and viscosities of fatty acid Ethyl Esters and biodiesels produced by ethanolysis from palm canola and soybean oils experimental data and calculation methodologies
Industrial & Engineering Chemistry Research, 2013Co-Authors: Rodrigo Correa Basso, Antonio J. A. Meirelles, Eduardo A C BatistaAbstract:Knowledge of the densities and viscosities of biodiesels is of great importance when designing equipment for synthesis processes and use of this biofuel in engines. Calculation methods for determining density and viscosity of products obtained from natural raw materials are powerful tools because the composition of this fuel varies. Despite the importance of biodiesel as a completely renewable biofuel, little data are available regarding the determination of its physical properties when produced with ethanol. In the present work, the density and viscosity of three biodiesels produced by ethanolysis were determined at different temperatures. A modified methodology was developed to calculate the viscosity of Ethyl Esters, and a new approach was presented for calculating density of Ethyl Esters and biodiesels produced by ethanolysis. The experimental data were compared to calculated data, resulting in average relative deviations ranging from 0.81 to 16.31% and from 0.25 to 0.62%, respectively, for biodiesel ...