Continuous esterification of oleic acid to ethyl oleate under sub/supercritical conditions over γ-Al2O3

2018 ◽  
Vol 232 ◽  
pp. 155-163 ◽  
Author(s):  
Jiuxu Liu ◽  
Yue Nan ◽  
Xinlei Huang ◽  
Jesse Q. Bond ◽  
Lawrence L. Tavlarides
Keyword(s):  
Oleic Acid ◽  
Ethyl Oleate ◽  
Supercritical Conditions

scholarly journals Satiety from fat? Adverse effects of intestinal infusion of sodium oleate

1997 ◽  
Vol 273 (5) ◽  
pp. R1779-R1785 ◽  
Author(s):  
Israel Ramirez ◽  
Michael G. Tordoff ◽  
Mark I. Friedman
Keyword(s):  
Oleic Acid ◽  
Fatty Acid ◽  
Food Intake ◽  
Eating Behavior ◽  
Sodium Oleate ◽  
Cell Damage ◽  
Ethyl Oleate ◽  
Intestinal Lumen ◽  
Ldh Activity ◽  
Intestinal Infusion

To determine whether damage to the intestinal mucosa by oleic acid causes the suppression of food intake observed in response to intraintestinal infusion of the fatty acid, we measured lactate dehydrogenase (LDH) activity, a marker for cell damage, in the intestinal lumen after intestinal infusion of fatty acid under conditions similar to those employed in studies of eating behavior. Infusions of 25 or 51 mM sodium oleate (neutralized oleic acid) markedly and rapidly increased LDH activity, whereas infusions of saline had little or no effect. Infusion of octanoate, which has been reported to be ineffective in reducing eating behavior, did not increase intestinal LDH activity relative to saline infusion. Similarly, infusion of ethyl oleate or free (nonneutralized) oleic acid neither increased luminal LDH activity nor suppressed food intake. Infusion of sodium oleate also produced a strong conditioned aversion to sucrose. The results strongly suggest that the suppression of food intake induced by intraintestinal infusion of sodium oleate is due to the injurious effects of this unphysiological form of the fatty acid.

Spectrophotometric Studies of the Oxidation of Fats. I. Oleic Acid, Ethyl Oleate and Elaidic Acid1

1945 ◽  
Vol 67 (8) ◽  
pp. 1285-1292 ◽  
Author(s):  
Ralph T. Holman ◽  
Walter O. Lundberg ◽  
Walter M. Lauer ◽  
George O. Burr
Keyword(s):  
Oleic Acid ◽  
Ethyl Oleate

scholarly journals ENZYMATIC PRODUCTION OF ETHYL OLEATE ESTER USING A LIPASE FROM CANDIDA ANTARCTICA B

2012 ◽  
Vol 2 ◽  
pp. 21
Author(s):  
N. Sampaio Neta ◽  
J. A. C. Cunha ◽  
S. O. Sancho ◽  
R. F. A. Abreu ◽  
D. F. Pontes ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Sodium Sulfate ◽  
Ethyl Oleate ◽  
Reaction Times ◽  
Candida Antarctica ◽  
Enzymatic Esterification ◽  
Type B ◽  
Enzymatic Production ◽  
Wide Range ◽  
Candida Antarctica B

Lipases are biocatalysts of great importance in different areas, being able to catalyze reactions in aqueous or organic media. Furthermore, these enzymes are capable of using several substrates being stable in a wide range of pH and temperatures. Lipases promote the esterification between fatty acids and ethanol producing oleate esters. The aim of this work is to produce ethyl oleate ester by enzymatic esterification of oleic acid with ethanol. A lipase from Candida antarctica type B was used at a temperature of 55 °C. The reaction was conducted using oleic acid, sodium sulfate anhydrous, lipase and ethanol, with a ratio of oleic acid (0.03 mol or 10 ml), lipase (0.1 mol or 0.01 g), sodium sulfate anhydrous (5 g) and ethanol 99 % (100 ml). Several reaction times were studied, namely 48, 72, 96 and 120 hours. Nuclear Magnetic Resonance (1H and 13C) and Infrared spectra confirmed the production of ethyl oleate ester for the studied conditions. The highest ethyl oleate production yield was obtained for 96 hours reaction time. Ethyl oleate esters have been reported to possess interesting applications in several industrial fields, such as food, aromatics, cosmetics, detergents, flavors and pharmaceuticals.

scholarly journals Phase Equilibria in Triacylglycerols – Ethanol – Oleic Acid – Athyl Oleate Quasi-Quaternary System

2014 ◽  
Vol 16 (4) ◽  
Author(s):  
I.A. Permyakova ◽  
V.V. Vol’khin ◽  
D.A. Kazakov ◽  
K. Kaczmarski ◽  
O.S. Kudryashova ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Phase Equilibria ◽  
Sunflower Oil ◽  
Quaternary System ◽  
Ethyl Oleate ◽  
Qualitative Assessment ◽  
Dispersion Forces ◽  
Ethanol Mixture ◽  
Composition Tetrahedron ◽  
Self Association

<p>In order to use waste vegetable oils to produce biodiesel a possibility of reagents (sunflower oil and ethanol) mixture homogenization under the simultaneous effect of two cosolvents (oleic acid and ethyl  oleate) was investigated. The possibility of action of oleic acid and ethyl oleate as cosolvents was analyzed with GSP model. For qualitative assessment of the intermolecular interaction parameter ξ was used. This parameter is a measure <br />of the ratio between cross-association (solvation) energy A–B and self-association (association) energies A–A and B–B. It was shown that most important role at intermolecular interactions of oleic acid and ethyl oleate with triglycerides belonged to dispersion forces. Predominant contribution of hydrogen bonds in the interaction of oleic acid and ethyl oleate with ethanol was shown. The prediction of improving the effect of the cosolvents with temperature increasing was done, and it was confirmed by experimental results.<br />The effect of oleic acid and ethyl oleate as cosolvents for homogenization of mixtures of sunflower oil and ethanol was investigated experimentally by studying the phase equilibria in the quasi-quaternary system triacylglycerols (sunflower oil) –ethanol –oleic acid –ethyl oleate at 30, 40, 50, 60 and 70 °C. The results of the experiments are presented in the form of phase diagrams of quasi-ternary boundary systems: triacylglycerols –oleic acid –ethanol and triacylglycerols –ethyl oleate –ethanol, and the phase <br />diagrams of composition tetrahedron sections with five different ratios of components oleic acid: ethyl oleate. Generalization of the research results is presented in the form of polythermal phase diagram for the system triacylglycerols –ethanol –oleic acid –ethyl oleate. Solubility polytherms (from 30 to 70 °C) for the system triacylglycerols –ethanol –mixed cosolvent with different ratios of oleic acid and ethyl oleate were plotted.</p>

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