نتایج جستجو برای: esterification

تعداد نتایج: 4313  

Journal: :Chemistry 2014
Ritwika Ray Rahul Dev Jana Mayukh Bhadra Debabrata Maiti Goutam Kumar Lahiri

The present article describes novel oxidative protocols for direct esterification of alcohols. The protocols involve successful demonstrations of both "cross" and "self" esterification of a wide variety of alcohols. The cross-esterification proceeds under a simple transition-metal-free condition, containing catalytic amounts of TEMPO (2,2,6,6-tetramethyl-1-piperidinyloxy)/TBAB (tetra-n-butylamm...

Journal: :The Journal of biological chemistry 1987
P S Bachorik D G Virgil P O Kwiterovich

We studied cholesterol synthesis from [14C]acetate, cholesterol esterification from [14C]oleate, and cellular cholesterol and cholesteryl ester levels after incubating cells with apoE-free high density lipoproteins (HDL) or low density lipoproteins (LDL). LDL suppressed synthesis by up to 60%, stimulated esterification by up to 280%, and increased cell cholesteryl ester content about 4-fold. Es...

Journal: :Journal of lipid research 1989
I Jialal A Chait

The rate of degradation of oxidatively modified low density lipoprotein (Ox-LDL) by human endothelial cells was similar to that of unmodified low density lipoprotein (LDL), and was approximately 2-fold greater than the rate of degradation of acetylated LDL (Ac-LDL). While LDL and Ac-LDL both stimulated cholesterol esterification in endothelial cells, Ox-LDL inhibited cholesterol esterification ...

2017
Huihui Wang Wei Chen Xueqin Zhang Chuanfu Liu Runcang Sun

The esterification of bagasse with glutaric anhydride could increase surface adhesion compatibility and the surface of derived polymers has the potential of immobilizing peptides or proteins for biomedical application. Due to its complicated components, the esterification mechanism of bagasse esterified with glutaric anhydride in ionic liquids has not been studied. In this paper, the homogenous...

2009
Preetha Sasi Rohit R Mehrotra

The esterification activity of microbial lipase (triacyl glycerol hydrolase, E.C. 3.1.1.3) in water-organic biphasic solvent system has been investigated. The lipase produced from Rhizopus arrhizus NCM997 strain by solid-state fermentation, using rice bran as substrate, exhibited novel capability of catalyzing esterification reaction. The partially purified lipase was coated with nonionic surfa...

2011
Yonghong Meng Guili Wang Na Yang Zhiqi Zhou Yuejuan Li Xiaomei Liang Jinnan Chen Ying Li Jilun Li

BACKGROUND Enzymatic biodiesel production by transesterification in solvent media has been investigated intensively, but glycerol, as a by-product, could block the immobilized enzyme and excess n-hexane, as a solution aid, would reduce the productivity of the enzyme. Esterification, a solvent-free and no-glycerol-release system for biodiesel production, has been developed, and two-step catalysi...

Journal: :iranian chemical communication 2015
hadi jabbari jabbar khalafy peyman najafi moghadam

a most effective and less energy demanding method of producing fatty esters, diol esters, by esterifying fatty acids, with neopentyl and ethylenglycol alcohols in the presence of an acidic ion exchange resin catalyst(polyestyrendivinylbenzensulfated) was investigated at elevated temperature. in this process an azeotroping agent, toluene, was used to facilitate continuous removal of water by dis...

Journal: :Journal of lipid research 1981
J J Albers C H Chen J L Adolphson

The relationship between plasma lecithin:cholesterol acyltransferase mass and enzyme activity and between mass and plasma cholesterol esterification rate was determined in 25 adult volunteers without overt disease (14 normolipidemic and 11 hyperlipidemic). Furthermore, the relationship of lecithin:cholesterol acyltransferase mass and cholesterol esterification rate to lipids, apoproteins, age, ...

2009
Xianghong Lu Yi Zhang Yunliang Yu Jianbing Ji

The free fatty acids in waste oil with high acid value were removed and transformed into fatty acid methyl esters by the extraction-reaction coupled process. The de-acidification efficiency and esterification conversion in the extraction-reaction coupled process were studied and compared with those in the stand-alone extraction process and the esterification process, respectively. Compared with...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 1996
V L Meiner S Cases H M Myers E R Sande S Bellosta M Schambelan R E Pitas J McGuire J Herz R V Farese

The microsomal enzyme acyl-CoA:cholesterol acyltransferase (ACAT; EC 2.3.1.26) catalyzes the esterification of cellular cholesterol with fatty acids to form cholesterol esters. ACAT activity is found in many tissues, including macrophages, the adrenal glands, and the liver. In macrophages, ACAT is thought to participate in foam cell formation and thereby to contribute to atherosclerotic lesion ...

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