Retention behavior oftrans isomers of eicosapentaenoic and docosahexaenoic acid methyl esters on a polyethylene glycol stationary phase

2008 ◽  
Vol 110 (6) ◽  
pp. 547-553 ◽  
Author(s):  
Svein A. Mjøs
Keyword(s):  
Polyethylene Glycol ◽  
Docosahexaenoic Acid ◽  
Stationary Phase ◽  
Methyl Esters ◽  
Retention Behavior ◽  
Acid Methyl

Equivalent chain lengths of all C4–C23 saturated monomethyl branched fatty acid methyl esters on methylsilicone OV-1 stationary phase

2011 ◽  
Vol 1218 (13) ◽  
pp. 1767-1774 ◽  
Author(s):  
Róbert Kubinec ◽  
Jaroslav Blaško ◽  
Renáta Górová ◽  
Gabriela Addová ◽  
Ivan Ostrovský ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Stationary Phase ◽  
Fatty Acid Methyl Esters ◽  
Methyl Esters ◽  
Acid Methyl ◽  
Chain Lengths

Gas chromatographic analysis of fatty acid methyl esters of milk fat by an ionic liquid derived from L-phenylalanine as the stationary phase

Talanta ◽  
2015 ◽  
Vol 143 ◽  
pp. 212-218 ◽  
Author(s):  
Laura González Mendoza ◽  
Jaime González-Álvarez ◽  
Carla Fernández Gonzalo ◽  
Pilar Arias-Abrodo ◽  
Belén Altava ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Fatty Acid ◽  
Stationary Phase ◽  
Milk Fat ◽  
Chromatographic Analysis ◽  
Fatty Acid Methyl Esters ◽  
Methyl Esters ◽  
Gas Chromatographic Analysis ◽  
Acid Methyl

LFER and CoMFA studies on optical resolution of ?-alkyl ?-aryloxy acetic acid methyl esters on DACH-DNB chiral stationary phase

1995 ◽  
Vol 9 (2) ◽  
pp. 131-138 ◽  
Author(s):  
Angelo Carotti ◽  
Cosimo Altomare ◽  
Saverio Cellamare ◽  
AnnaMaria Monforte ◽  
Giancarlo Bettoni ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Stationary Phase ◽  
Chiral Stationary Phase ◽  
Methyl Esters ◽  
Optical Resolution ◽  
Acid Methyl

Enzymic characterization of epidermis-derived 12-lipoxygenase isoenzymes

2001 ◽  
Vol 355 (1) ◽  
pp. 97-104 ◽  
Author(s):  
Malte SIEBERT ◽  
Peter KRIEG ◽  
Wolf D. LEHMANN ◽  
Friedrich MARKS ◽  
Gerhard FÜRSTENBERGER
Keyword(s):  
Arachidonic Acid ◽  
Catalytic Activity ◽  
Linoleic Acid ◽  
Methyl Ester ◽  
Docosahexaenoic Acid ◽  
Methyl Esters ◽  
Acid Methyl Ester ◽  
Dienoic Acid ◽  
Acidic Ph ◽  
Acid Methyl

Substrate selectivity and other enzymic characteristics of two epidermis-derived lipoxygenases (LOXs), the epidermis-type (e) (12S)-LOX and (12R)-LOX, were compared with those of the platelet-type (p) (12S)-LOX. In contrast with p(12S)-LOX, e(12S)-LOX and (12R)-LOX exhibited no or very low reactivity towards the customary substrates linoleic acid and arachidonic acid but metabolized the corresponding fatty acid methyl esters, which, in contrast, were not accepted as substrates by p(12S)-LOX. Other esters of arachidonic acid and linoleic acid, including propan-2-yl and cholesterol esters, 1-palmitoyl-2-arachidonyl-sn-glycero-3-phosphocholine, 1-palmitoyl-2-linoleyl-sn-glycero-3-phosphoethanolamine, and ceramide 1 carrying an ω-linoleic acid ester, were not metabolized by these three LOX isoenzymes. Among various polyunsaturated fatty acids the isomeric eicosatrienoic acids were found to be oxygenated by e(12S)-LOX but not by (12R)-LOX. 4,7,10,13,16,19-Docosahexaenoic acid as a substrate was restricted to p(12S)-LOX. Variations in the pH and the Ca2+ content of the incubation medium affected the catalytic potential only slightly. Whereas (12R)-LOX activity increased in the presence of Ca2+ and with an acidic pH, Ca2+ had no effect on p(12S)-LOX and e(12S)-LOX; an acidic pH decreased the catalytic activity of the latter two. However, the catalytic activity of the epidermis-type isoenzymes, but not of p(12S)-LOX, was found to be markedly increased in the presence of DMSO. Under these conditions, e(12S)-LOX and (12R)-LOX oxygenated 4,7,10,13,16,19-docosahexaenoic acid to 14-hydroxy-4,7,10,12,16,19-docosahexaenoic acid and 13-hydroxy-4,7,10,14,16,19-docosahexaenoic acid respectively. In addition, (9R)-hydroxyoctadeca-10,12-dienoic acid methyl ester was generated from linoleic acid methyl ester by (12R)-LOX. Independently of the substrate, the catalytic activity of e(12S)-LOX and (12R)-LOX was always at most 2% of that of p(12S)-LOX with arachidonic acid as substrate.

scholarly journals Potassium iodide–polyethylene glycol catalyzed cycloaddition reaction of epoxidized soybean oil fatty acid methyl esters with CO2

RSC Advances ◽  
2018 ◽  
Vol 8 (54) ◽  
pp. 30860-30867 ◽  
Author(s):  
Wei Liu ◽  
Guanghui Lu ◽  
Bing Xiao ◽  
Chenfei Xie
Keyword(s):  
Carbon Dioxide ◽  
Fatty Acid ◽  
Polyethylene Glycol ◽  
Soybean Oil ◽  
Potassium Iodide ◽  
Fatty Acid Methyl Esters ◽  
Methyl Esters ◽  
Cycloaddition Reaction ◽  
Acid Methyl ◽  
Fixation Of Carbon Dioxide

Nowadays, the clean production of bio-based products and fixation of carbon dioxide (CO2) are highly desirable.

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