Hydrogenation of Fatty Acid Esters. III. Hydrogenation of Methyl (9Z,12Z)-Octadecadienoate and Methyl (9Z,12Z,15Z)-Octadecatrienoate

1992 ◽  
Vol 57 (12) ◽  
pp. 2593-2604 ◽  
Author(s):  
Jana Krupičková ◽  
Jaroslav Včelák ◽  
Jiří Hetflejš
Keyword(s):  
Fatty Acid ◽  
Rate Constants ◽  
Initial Rate ◽  
Product Distribution ◽  
Fatty Acid Esters ◽  
Product Analysis ◽  
First Order ◽  
Time Changes ◽  
Acid Esters

The title hydrogenation catalyzed by nickel(II) 2,4-pentanedionate-triethylaluminium system has been studied with the use of combination of initial rate measurements with time changes of product distribution. It was found that the hydrogenation of methyl (9Z,12Z)-octadecadienoate is first order in the octadecadienoate. Similar results were obtained also for (9Z,12Z,15Z)-octadecatrienoate. The course of both reactions has been described by models involving set of parallel and consecutive hydrogenation steps and reversible isomerizations. Computed rate constants for hydrogenation of methyl (9Z,12Z)-octadecadienoate support qualitative conclusions deduced from the product analysis.

Hydrogenation of Fatty Acid Esters. II. Kinetics of Hydrogenation of Methyl (Z)- and (E)-9-Octadecenoate Catalyzed by a Ziegler Nickel Catalyst

1992 ◽  
Vol 57 (12) ◽  
pp. 2583-2592 ◽  
Author(s):  
Jana Krupičková ◽  
Jaroslav Včelák ◽  
Jiří Hetflejš
Keyword(s):  
Fatty Acid ◽  
Nickel Catalyst ◽  
Fractional Order ◽  
Initial Rate ◽  
Zero Order ◽  
Model Catalyst ◽  
Fatty Acid Esters ◽  
First Order ◽  
Kinetics Of ◽  
Acid Esters

Kinetics of the title reactions has been studied, using nickel(II) 2,4-pentanedionate/triethylaluminium system as a model catalyst. Initial rate measurements showed that in both cases the hydrogenation is first order in hydrogen, zero order in the octadecanoate and a fractional order (close to one) in the catalyst. Both hydrogenations have similar activation energies (30.2 ± 2.3 kJ mol-1 and 28.9 ± 2.6 kJ mol-1 for the (Z)- and (E)-9-octadecenoate, respectively). Based on these data and the results of competition experiments, two models have been proposed to describe isomerization of the octadecenoates (either direct or via an intermediate).

Development of the determination methods of fatty acid esters of chloropropanediols in fat-rich foods

2014 ◽  
Vol 31 (2) ◽  
pp. 95-101
Author(s):  
Xiaobo YAN ◽  
Shaoming WU ◽  
Nan LI ◽  
Huadong LV ◽  
Wusheng FU
Keyword(s):  
Fatty Acid ◽  
Fatty Acid Esters ◽  
Determination Methods ◽  
Acid Esters

Mesomorphic Behaviour of Saturated and Monounsaturated C18 and C22 Fatty Acid Esters of Cholesterol

1994 ◽  
Vol 59 (4) ◽  
pp. 833-840
Author(s):  
Slavomír Pirkl
Keyword(s):  
Phase Transitions ◽  
Fatty Acid ◽  
Fatty Acid Esters ◽  
Aliphatic Esters ◽  
Acid Esters

The phase transitions and effective optical rotary power of saturated and monounsaturated aliphatic esters of cholesterol with 18 and 22 carbon atoms in the chain have been described. The effect of cis/trans isomerism on these properties is discussed.

The occurrence of long chain polyprenols in leaves of plants of Rosaceae family and their isolation by time-extended liquid chromatography

1992 ◽  
Vol 70 (6) ◽  
pp. 448-454 ◽  
Author(s):  
Ewa Świeżewska ◽  
T. Chojnacki ◽  
W. J. Jankowski ◽  
K. Singh ◽  
J. Olsson
Keyword(s):  
Liquid Chromatography ◽  
Fatty Acid ◽  
Large Scale ◽  
Fatty Acid Esters ◽  
Large Scale Preparation ◽  
Scale Preparation ◽  
Wet Weight ◽  
Rosaceae Family ◽  
Acid Esters ◽  
Long Chain

The long chain polyprenols composed of 30 and more isoprene units from leaves of plants belonging to the genera Potentilla and Rosa have been described. They occur in the form of fatty acid esters. The composition of polyprenol mixture was species dependent and its content reached ca. 0.5% wet weight. Large scale preparation of individual polyprenols from a natural polyprenol mixture was performed using time-extended liquid chromatography on the hydrophobic gel Lipidex-5000.Key words: long chain polyprenols, Rosaceae.

Separation of Fatty Acid Dimethyl Esters on an Ionic Liquid Gas Chromatographic Column

2020 ◽  
Author(s):  
R E Pauls ◽  
B Pease
Keyword(s):  
Ionic Liquid ◽  
Fatty Acid ◽  
Stationary Phases ◽  
Carbon Number ◽  
Fatty Acid Esters ◽  
Reaction Products ◽  
Isomer Separation ◽  
Metathesis Reaction ◽  
Polydimethyl Siloxane ◽  
Acid Esters

Abstract An ionic liquid (IL) 111 column was compared with other commonly employed stationary phases including polydimethyl siloxane and polyethylene glycol for the separation of fatty acid monomethyl and dimethyl esters. The fatty acid esters employed in this study were derived from metathesis reactions of vegetable oils both with and without olefins. The IL 111 column demonstrated enhanced performance compared with conventional columns for the separation of these esters. These advantages included significantly enhanced retention of dimethyl esters relative to monomethyl esters, excellent cis/trans isomer separation and the ability to analyze higher carbon number dimethyl esters. As a result, these columns are highly suited for the analysis of mixtures of mono- and dimethyl fatty acid esters found in lipid metathesis reaction products or to determine monofunctional impurities in samples of commercial dimethyl esters.

scholarly journals Terminal Trialkylsilyl Substituent Effect of Janus-type Molecular Tubes on the Inclusion of Unsaturated Fatty Acid Esters

ACS Omega ◽  
2021 ◽  
Vol 6 (4) ◽  
pp. 3227-3231
Author(s):  
Chizuru Kogame-Asahara ◽  
Hitomi Iguchi ◽  
Kenichiro Honda ◽  
Hajime Shigemitsu ◽  
Toshiyuki Kida
Keyword(s):  
Fatty Acid ◽  
Unsaturated Fatty Acid ◽  
Substituent Effect ◽  
Fatty Acid Esters ◽  
Molecular Tubes ◽  
Acid Esters

Effect of composition of sucrose fatty acid esters on formation of palladium nanoparticles in reverse micelles

2009 ◽  
Vol 287 (7) ◽  
pp. 795-799 ◽  
Author(s):  
Hidetaka Noritomi ◽  
Kenji Kagitani ◽  
Yasutaka Muratsubaki ◽  
Satoru Kato
Keyword(s):  
Fatty Acid ◽  
Palladium Nanoparticles ◽  
Reverse Micelles ◽  
Fatty Acid Esters ◽  
Sucrose Fatty Acid Esters ◽  
Acid Esters
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