Oleic Acid and Undecylenic Acid as Platform Chemicals for Thermoplastic Polyurethanes

2012 ◽  
pp. 269-280 ◽  
Author(s):  
Gerard Lligadas ◽  
Juan C. Ronda ◽  
Marina Galià ◽  
Virginia Cádiz
Keyword(s):  
Oleic Acid ◽  
Undecylenic Acid ◽  
Thermoplastic Polyurethanes ◽  
Platform Chemicals

scholarly journals Inhibition of steroid 5α-reductase by specific aliphatic unsaturated fatty acids

1992 ◽  
Vol 285 (2) ◽  
pp. 557-562 ◽  
Author(s):  
T Liang ◽  
S Liao
Keyword(s):  
Fatty Acids ◽  
Oleic Acid ◽  
Linoleic Acid ◽  
Linolenic Acid ◽  
Unsaturated Fatty Acids ◽  
Binding Assay ◽  
Reductase Activity ◽  
Undecylenic Acid ◽  
Gamma Linolenic Acid ◽  
Enzymic Assay

Human or rat microsomal 5 alpha-reductase activity, as measured by enzymic conversion of testosterone into 5 alpha-dihydrotestosterone or by binding of a competitive inhibitor, [3H]17 beta-NN-diethulcarbamoyl-4-methyl-4-aza-5 alpha-androstan-3-one ([3H]4-MA) to the reductase, is inhibited by low concentrations (less than 10 microM) of certain polyunsaturated fatty acids. The relative inhibitory potencies of unsaturated fatty acids are, in decreasing order: gamma-linolenic acid greater than cis-4,7,10,13,16,19-docosahexaenoic acid = cis-6,9,12,15-octatetraenoic acid = arachidonic acid = alpha-linolenic acid greater than linoleic acid greater than palmitoleic acid greater than oleic acid greater than myristoleic acid. Other unsaturated fatty acids such as undecylenic acid, erucic acid and nervonic acid, are inactive. The methyl esters and alcohol analogues of these compounds, glycerols, phospholipids, saturated fatty acids, retinoids and carotenes were inactive even at 0.2 mM. The results of the binding assay and the enzymic assay correlated well except for elaidic acid and linolelaidic acid, the trans isomers of oleic acid and linoleic acid respectively, which were much less active than their cis isomers in the binding assay but were as potent in the enzymic assay. gamma-Linolenic acid had no effect on the activities of two other rat liver microsomal enzymes: NADH:menadione reductase and glucuronosyl transferase. gamma-Linolenic acid, the most potent inhibitor tested, decreased the Vmax. and increased Km values of substrates, NADPH and testosterone, and promoted dissociation of [3H]4-MA from the microsomal reductase. gamma-Linolenic acid, but not the corresponding saturated fatty acid (stearic acid), inhibited the 5 alpha-reductase activity, but not the 17 beta-dehydrogenase activity, of human prostate cancer cells in culture. These results suggest that unsaturated fatty acids may play an important role in regulating androgen action in target cells.

scholarly journals Application of a Multienzymatic System from Natural Latex in Key Reactions for oil-Based Biorefineries

Fermentation ◽  
2019 ◽  
Vol 5 (1) ◽  
pp. 18
Author(s):  
Daniel Sánchez ◽  
Susana Morcelle ◽  
María Fait ◽  
Gabriela Tonetto ◽  
María Ferreira
Keyword(s):  
Oleic Acid ◽  
Soybean Oil ◽  
Crucial Role ◽  
Esterification Reaction ◽  
Platform Chemicals ◽  
Excellent Activity ◽  
Comparable Activity ◽  
Biotechnological Processes ◽  
Hydrolysis Of

Oil-based biorefineries play a crucial role in the production of key platform chemicals that can be generated via biotechnological processes instead of a petrochemical route. This work focuses on the latex of the fruit of Araujia sericifera, which can be considered a multienzymatic system with applications in key reactions in oil-based biorefineries. The latex of Araujia sericifera (ASL) was used as a novel biocatalyst in the esterification of oleic acid and in the hydrolysis of triglycerides and p-nitrophenyl carboxylates. When ASL was compared to a commercial biocatalyst, it showed an excellent activity in the hydrolysis of soybean oil and p-nitropheyl laurate, and a comparable activity in the esterification reaction.

Thermoplastic Polyurethanes From Undecylenic Acid-Based Soft Segments: Structural Features and Release Properties

2013 ◽  
Vol 13 (5) ◽  
pp. 614-622 ◽  
Author(s):  
Cristina Lluch ◽  
Gerard Lligadas ◽  
Joan C. Ronda ◽  
Marina Galià ◽  
Virginia Cádiz
Keyword(s):  
Structural Features ◽  
Undecylenic Acid ◽  
Thermoplastic Polyurethanes ◽  
Soft Segments

Characteristic analysis of Fe3O4 nanoparticles modified by oleic acid and undecylenic acid

2017 ◽  
Vol 25 (6) ◽  
pp. 363-370 ◽  
Author(s):  
Ying Chen ◽  
Yan-qing Dong ◽  
Zhe Yan ◽  
Dong Chen ◽  
Yong Chen ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Fe3o4 Nanoparticles ◽  
Undecylenic Acid ◽  
Characteristic Analysis

scholarly journals Hierarchy in zeolite catalysis: The influence of enhanced mesoporosity on the synthesis of renewable fuels and bio-based platform chemicals

2020 ◽  
Vol 10 (4) ◽  
pp. 217-232
Author(s):  
Aqeel Al-Ani ◽  
Catia Freitas ◽  
Vladimir Zholobenko
Keyword(s):  
Oleic Acid ◽  
Active Sites ◽  
Strong Acid ◽  
Catalytic Performance ◽  
Acid Sites ◽  
Zeolite Catalysis ◽  
Chemical Treatments ◽  
Platform Chemicals ◽  
Fau Zeolite ◽  
Strong Acid Sites

Faujasite (FAU), ZSM-5 (MFI), beta (BEA) and mordenite (MOR) zeolites were admitted to a variety of chemical treatments accompanied by surfactant templating strategy, aiming to introduce the intracrystalline mesoporosity effectively. The resulting materials were tested as solid acid catalysts for esterification of the oleic acid as a common model impurities found in bio-oil feedstoks. It was found that the esterification of oleic acid can be enhanced by the presence of strong acid sites in zeolites and their improved accessibility. Overall, mesostructured FAU zeolite demonstrated an improved catalytic performance as a result of increasing accessibility of the zeolite active sites.

A magnetic super lattice

1987 ◽  
Vol 45 ◽  
pp. 360-361 ◽  
Author(s):  
M.D. Bentzon ◽  
J. v. Wonterghem ◽  
A. Thölén
Keyword(s):  
Thermal Decomposition ◽  
Oleic Acid ◽  
Magnetic Fluid ◽  
Magnetic Particles ◽  
Carbon Film ◽  
Thick Layer ◽  
Amorphous Iron ◽  
Super Lattice ◽  
Carrier Liquid ◽  
Median Diameter

We report on the oxidation of a magnetic fluid. The oxidation results in magnetic super lattice crystals. The “atoms” are hematite (α-Fe2O3) particles with a diameter ø = 6.9 nm and they are covered with a 1-2 nm thick layer of surfactant molecules.Magnetic fluids are homogeneous suspensions of small magnetic particles in a carrier liquid. To prevent agglomeration, the particles are coated with surfactant molecules. The magnetic fluid studied in this work was produced by thermal decomposition of Fe(CO)5 in Declin (carrier liquid) in the presence of oleic acid (surfactant). The magnetic particles consist of an amorphous iron-carbon alloy. For TEM investigation a droplet of the fluid was added to benzine and a carbon film on a copper net was immersed. When exposed to air the sample starts burning. The oxidation and electron irradiation transform the magnetic particles into hematite (α-Fe2O3) particles with a median diameter ø = 6.9 nm.

Intestinal Absorption of Iodine131-Labeled Triolein and Oleic Acid in Normal Subjects and in Steatorrhea

1958 ◽  
Vol 34 (5) ◽  
pp. 901-909 ◽  
Author(s):  
Ervin Kaplan ◽  
Bernard D. Edidin ◽  
Robert C. Fruin ◽  
Lyle A. Baker
Keyword(s):  
Oleic Acid ◽  
Intestinal Absorption ◽  
Normal Subjects

Stable production of platform chemicals from the continuous hydrodeoxygenation of a raw bio-oil using enhanced carbon-based catalysts

2020 ◽  
Author(s):  
Idoia Hita ◽  
Tomas Cordero-Lanzac ◽  
Francisco J. Garcia-Mateos ◽  
Jose Rodriguez-Mirasol ◽  
Tomas Cordero ◽  
...  
Keyword(s):  
Platform Chemicals ◽  
Stable Production ◽  
Bio Oil ◽  
Carbon Based

Stable production of platform chemicals from the continuous hydrodeoxygenation of a raw bio-oil using enhanced carbon-based catalysts

2020 ◽  
Author(s):  
Idoia Hita ◽  
Tomas Cordero-Lanzac ◽  
Francisco J. Garcia-Mateos ◽  
Jose Rodriguez-Mirasol ◽  
Tomas Cordero ◽  
...  
Keyword(s):  
Platform Chemicals ◽  
Stable Production ◽  
Bio Oil ◽  
Carbon Based

Oleic acid

2015 ◽  
Author(s):  
LB Becnel ◽  
YF Darlington ◽  
S Orechsner ◽  
J Easton-Marks ◽  
CA Watkins ◽  
...  
Keyword(s):  
Oleic Acid
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