Transformation of naturally occurring (3R,3′R,6′R)-lutein and its fatty acid esters to (3 R)-β-cryptoxanthin and (3R,6′R)-α-cryptoxanthin

2018 ◽  
Vol 653 ◽  
pp. 107-112 ◽  
Author(s):  
Frederick Khachik
Keyword(s):  
Fatty Acid ◽  
Fatty Acid Esters ◽  
Naturally Occurring ◽  
Acid Esters

The naturally occurring C-17 fatty acid esters of estradiol are long-acting estrogens

1985 ◽  
Vol 22 (3) ◽  
pp. 407-413 ◽  
Author(s):  
Janice M. Larner ◽  
Neil J. MacLusky ◽  
Richard B. Hochberg
Keyword(s):  
Fatty Acid ◽  
Fatty Acid Esters ◽  
Naturally Occurring ◽  
Long Acting ◽  
Acid Esters

GAS CHROMATOGRAPHIC FRACTIONATION OF NATURAL STERYL ESTER MIXTURES

1964 ◽  
Vol 42 (3) ◽  
pp. 407-417 ◽  
Author(s):  
A. Kuksis
Keyword(s):  
Fatty Acid ◽  
Carbon Number ◽  
Fatty Acid Esters ◽  
Side Chain ◽  
Sterol Esters ◽  
Steryl Esters ◽  
Naturally Occurring ◽  
Methylene Unit ◽  
The Common ◽  
Acid Esters

Synthetic and naturally occurring mixtures of fatty acid esters of cholesterol and plant sterols were separated by gas chromatography under the conditions previously described for triglyceride fractionation. The separations obtained were based primarily on the molecular weight or carbon number of the material, a difference of one methylene unit either in the fatty acid or the sterol side chain being usually sufficient for a complete resolution. Under isothermal conditions, however, partial separations could also be brought about between certain esters differing only in the unsaturation of the fatty acid moiety. Using weighed mixtures of synthetic steryl esters proportionally correct quantitative recoveries were demonstrated for both cholesterol and plant sterol esters of the common fatty acids.

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.

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