Temperature effects in the calculation of equivalent chain length values for multiple-branched fatty acid esters and ketones on polar and non-polar open tubular columns

1969 ◽  
Vol 42 ◽  
pp. 170-175 ◽  
Author(s):  
R.G. Ackman
Keyword(s):  
Fatty Acid ◽  
Chain Length ◽  
Equivalent Chain Length ◽  
Temperature Effects ◽  
Fatty Acid Esters ◽  
Tubular Columns ◽  
Open Tubular Columns ◽  
Acid Esters

scholarly journals SELECTIVITY OF CANDIDA RUGOSA LIPASE IMMOBILIZED ONTO LAYERED DOUBLE HYDROXIDES AS CATALYST IN SYNTHESIS OF FATTY ACID ESTERS

2016 ◽  
Vol 78 (5-6) ◽  
Author(s):  
Mohd Basyaruddin Abdul Rahman ◽  
Siti Salhah Othman ◽  
Noor Mona Md Yunus
Keyword(s):  
Fatty Acids ◽  
Fatty Acid ◽  
Chain Length ◽  
Candida Rugosa ◽  
Candida Rugosa Lipase ◽  
Carbon Chain ◽  
Fatty Acid Esters ◽  
Carbon Chain Length ◽  
Chain Lengths ◽  
Acid Esters

The enzymatic selectivity of Lipase from Candida rugosa immobilized onto a calcined layered double hydroxide (CLDHs-CRL) towards the chain-length of fatty acids and alcohols in the synthesis of fatty acid esters was investigated.  The results showed that CMAN-CRL catalyzed the esterification process with fatty acids of medium chain lengths (C10-C14) effectively while, CNAN-CRL and CZAN-CRL exhibited high percentage conversion in fatty acids with carbon chain lengths of C8-C12 and C10-C18, respectively. In the alcohol selectivity study, CMAN-CRL showed high selectivity toward alcohols with carbon chain lengths of C4, C6 and C10.  On the other hand, both CNAN-CRL and CZAN-CRL exhibited rather low selectivity towards longer carbon chain length of alcohols. 

scholarly journals Impact of Selected Cosmetic Ingredients on Common Microorganisms of Healthy Human Skin

Cosmetics ◽  
2019 ◽  
Vol 6 (3) ◽  
pp. 45 ◽  
Author(s):  
Dorota Dobler ◽  
Thomas Schmidts ◽  
Sören Wildenhain ◽  
Ilona Seewald ◽  
Michael Merzhäuser ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Fatty Acid ◽  
Human Skin ◽  
Chain Length ◽  
Skin Diseases ◽  
Free Acid ◽  
Fatty Alcohols ◽  
Fatty Acid Esters ◽  
Bacterial Strains ◽  
Acid Esters

Human skin is a complex ecosystem and is host to a large number of microorganisms. When the bacterial ecosystem is balanced and differentiated, skin remains healthy. However, the use of cosmetics can change this balance and promote the appearance of skin diseases. The skin’s microorganisms can utilize some cosmetic components, which either promote their growth, or produce metabolites that influence the skin environment. In this study, we tested the ability of the Malassezia species and some bacterial strains to assimilate substances frequently used in dermal formulations. The growth capability of microorganisms was determined and their lipase activity was analyzed. The growth of all Malassezia spp. in the presence of free acids, free acid esters, and fatty alcohols with a fatty chain length above 12 carbon atoms was observed. No growth was observed in the presence of fatty alcohol ethers, secondary fatty alcohols, paraffin- and silicon-based substances, polymers, polyethylene glycols, quaternary ammonium salts, hydroxy fatty acid esters, or fatty acids and fatty acid esters with a fatty chain length shorter than 12 carbon atoms. The hydrolysis of esters by Malassezia lipases was detected using High Performance Thin Layer Chromatography (HPTLC). The production of free fatty acids as well as fatty alcohols was observed. The growth promotion or inhibition of bacterial strains was only found in the presence of a few ingredients. Based on these results, formulations containing microbiome inert ingredients were developed.

THE SEPARATION OF SATURATED AND UNSATURATED FATTY ACID ESTERS BY GAS–LIQUID CHROMATOGRAPHY

1958 ◽  
Vol 36 (9) ◽  
pp. 1297-1301 ◽  
Author(s):  
B. M. Craig ◽  
N. L. Murty
Keyword(s):  
Fatty Acid ◽  
Chain Length ◽  
Methyl Esters ◽  
Carbon Number ◽  
Fats And Oils ◽  
Fatty Acid Esters ◽  
Gas Liquid Chromatography ◽  
Silicone Grease ◽  
Degree Of Unsaturation ◽  
Acid Esters

Fatty acid methyl esters are separated according to chain length by using washed silicone grease supported on 20–40 mesh C22 firebrick. By using a plasticizer on the firebrick support the same esters are separated according to both chain length and degree of unsaturation. Together the two procedures can be used to determine the component fatty acids in fats and oils. Nearly parallel linear relations are obtained for saturated, monoethenoid, diethenoid, and triethenoid methyl esters when the logarithm of emergence time is plotted against the carbon number of the fatty acid.

scholarly journals The occurrence of long-chain polyprenols in leaves of plants of Combretaceae family.

1996 ◽  
Vol 43 (4) ◽  
pp. 707-711 ◽  
Author(s):  
V Kulcitsky ◽  
J Hertel ◽  
E Skoczylas ◽  
E Swiezewska ◽  
T Chojnacki
Keyword(s):  
Fatty Acid ◽  
Chain Length ◽  
Plant Species ◽  
Dry Mass ◽  
Fatty Acid Esters ◽  
Combretum Molle ◽  
Acid Esters ◽  
Long Chain

The presence of poly-cis-prenols of chain length 20-60 isoprene units or longer in leaves of plants belonging to Combretaceae family was shown to be a common feature in this group of plants. The polyprenols of this type were found in half of the 20 species studied. In most cases the polyprenols occurred in the form of fatty acid esters. Only in one species--Combretum molle, the polyprenols were found in the form of free alcohols. The amount of long-chain polyprenols varied with the plant species; the richest source was C. molle (about 4% of dry mass of leaves). Polyprenol groups characteristic of other systematic families of plants were not found in the Combretaceae studied.

Self-Organizing Properties of Monosubstituted Sucrose Fatty Acid Esters: The Effects of Chain Length and Unsaturation

2006 ◽  
Vol 12 (13) ◽  
pp. 3547-3557 ◽  
Author(s):  
Valérie Molinier ◽  
Paul J. J. Kouwer ◽  
Juliette Fitremann ◽  
Alain Bouchu ◽  
Grahame Mackenzie ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Chain Length ◽  
Fatty Acid Esters ◽  
Sucrose Fatty Acid Esters ◽  
Acid Esters ◽  
Self Organizing

The effect of side-chain length of cellulose fatty acid esters on their thermal, barrier and mechanical properties

Cellulose ◽  
2016 ◽  
Vol 24 (2) ◽  
pp. 505-517 ◽  
Author(s):  
Pia Willberg-Keyriläinen ◽  
Jari Vartiainen ◽  
Ali Harlin ◽  
Jarmo Ropponen
Keyword(s):  
Mechanical Properties ◽  
Fatty Acid ◽  
Chain Length ◽  
Fatty Acid Esters ◽  
Side Chain ◽  
Thermal Barrier ◽  
Side Chain Length ◽  
Acid Esters

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.

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