scholarly journals Gas‐Phase Models for the Nickel‐ and Palladium‐Catalyzed Deoxygenation of Fatty Acids

ChemCatChem ◽  
2020 ◽  
Vol 12 (21) ◽  
pp. 5476-5485 ◽  
Author(s):  
Kevin Parker ◽  
Geethika K. Weragoda ◽  
Victoria Pho ◽  
Allan J. Canty ◽  
Anastasios Polyzos ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Gas Phase ◽  
Palladium Catalyzed ◽  
Phase Models

Gas-phase models of γ turns: Effect of side-chain/backbone interactions investigated by IR/UV spectroscopy and quantum chemistry

2005 ◽  
Vol 123 (8) ◽  
pp. 084301 ◽  
Author(s):  
Wutharath Chin ◽  
François Piuzzi ◽  
Jean-Pierre Dognon ◽  
Iliana Dimicoli ◽  
Michel Mons
Keyword(s):  
Quantum Chemistry ◽  
Gas Phase ◽  
Uv Spectroscopy ◽  
Side Chain ◽  
Phase Models

PHOSPHOLIPID METABOLISM IN LIVER SLICES: LABELLING OF PHOSPHOLIPIDS WITH ACETATE-1-C14

1956 ◽  
Vol 34 (3) ◽  
pp. 429-440 ◽  
Author(s):  
Dorothy L. Kline ◽  
H. A. DeLuca
Keyword(s):  
Fatty Acids ◽  
Gas Phase ◽  
Time Course ◽  
Specific Activity ◽  
Phospholipid Metabolism ◽  
Great Decrease ◽  
Lipid Fractions ◽  
Optimum Ph ◽  
Specific Activities ◽  
Guinea Pig Liver

A study has been made of the labelling of the phospholipids, the fatty acids from the acetone-soluble lipid, and the non-esterified cholesterol in slices of rat and guinea pig liver respiring in a suitably buffered Krebs–Ringer medium containing acetate-1-C14. The time course of the reactions and the effects of the concentration of potassium ion and the pH of the incubating medium have been defined. For phospholipid and fatty acids of the acetone-soluble lipid, the optimum pH was in the range 6.8–7.4, whereas for cholesterol there was a much sharper optimum at pH 6.6–6.8. When the oxygen of the gas phase was replaced with nitrogen, the labelling of all three lipid fractions was abolished. The addition of glucose to the incubating medium slightly increased the labelling of the phospholipids and the fatty acids of the acetone-soluble lipid, but had no consistent effect on the labelling of the non-esterified cholesterol. Purification of the cholesterol by the method of bromination and debromination caused only a slight change in specific activity, indicating that the cholesterol was not contaminated with large amounts of companion substances with specific activities greatly different from that of the cholesterol itself. The addition of cyanide, fluoride, iodoacetate, or 2,4-dinitrophenol to the incubating medium caused a great decrease in the labelling of all fractions studied. With the exception of 2,4-dinitrophenol, the inhibitors were used in concentrations that inhibit the oxygen consumption. Malonate inhibited the incorporation of acetate-1-C14 into cholesterol, but did not affect the labelling of the phospholipids. When the acetate-1-C14 was replaced with other C14-labelled precursors, good labelling of phospholipids was observed with glycine-2-C14, glycerol-1-C14, and fructose-C11, but not with formate-C14, lactate-1-C14, or glucose-C14. The cholesterol was not significantly labelled from any of the precursors other than acetate-1-C14.

scholarly journals Measurement of Acetate in Aqueous Solutions and Plasma by Gas Phase Chromatography using a Porous Polymer Stationary Phase

1978 ◽  
Vol 15 (1-6) ◽  
pp. 228-232 ◽  
Author(s):  
M. F. Laker ◽  
M. A. Mansell
Keyword(s):  
Fatty Acids ◽  
Stationary Phase ◽  
Gas Phase ◽  
Retention Time ◽  
Healthy Subjects ◽  
Volatile Fatty Acids ◽  
Reference Range ◽  
Porous Polymer ◽  
Plasma Samples ◽  
Apparently Healthy

Summary A method of acetate determination by gas phase chromatography using a porous polymer stationary phase is reported that is suitable for use with aqueous and plasma samples. It is linear up to 100 mmol/l and has a coefficient of variation of less than 4 % for acetate values of greater than 1 mmol/l. The recovery of acetate from plasma is 92 % and sample retention time is 3 minutes. The reference range of plasma acetate in a group of 40 apparently healthy subjects was from less than 0·1 to 0·35 mmol/l. The frequently encountered problem of adsorption and ghosting of volatile fatty acids is overcome without the addition of formic acid vapour to the carrier gas.

Fuel Droplet Heating and Evaporation: Analysis of Liquid and Gas Phase Models

2007 ◽  
Author(s):  
S. S. Sazhin ◽  
T. Kristyadi ◽  
M. R. Heikal ◽  
W. A. Abdelghaffar ◽  
I. N. Shishkova
Keyword(s):  
Gas Phase ◽  
Fuel Droplet ◽  
Phase Models

scholarly journals Formation of gas-phase carbonyls from heterogeneous oxidation of polyunsaturated fatty acids at the air–water interface and of the sea surface microlayer

2014 ◽  
Vol 14 (3) ◽  
pp. 1371-1384 ◽  
Author(s):  
S. Zhou ◽  
L. Gonzalez ◽  
A. Leithead ◽  
Z. Finewax ◽  
R. Thalman ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Polyunsaturated Fatty Acids ◽  
Gas Phase ◽  
Sea Surface ◽  
Optical Absorption Spectroscopy ◽  
Initial Reaction ◽  
Surface Microlayer ◽  
Secondary Products ◽  
Heterogeneous Oxidation ◽  
Sea Surface Microlayer

Abstract. Motivated by the potential for reactive heterogeneous chemistry occurring at the ocean surface, gas-phase products were observed when a reactive sea surface microlayer (SML) component, i.e. the polyunsaturated fatty acids (PUFA) linoleic acid (LA), was exposed to gas-phase ozone at the air–seawater interface. Similar oxidation experiments were conducted with SML samples collected from two different oceanic locations, in the eastern equatorial Pacific Ocean and from the west coast of Canada. Online proton-transfer-reaction mass spectrometry (PTR-MS) University of Colorado light-emitting diode cavity-enhanced differential optical absorption spectroscopy (LED-CE-DOAS) were used to detect oxygenated gas-phase products from the ozonolysis reactions. The LA studies indicate that oxidation of a PUFA monolayer on seawater gives rise to prompt and efficient formation of gas-phase aldehydes. The products are formed via the decomposition of primary ozonides which form upon the initial reaction of ozone with the carbon–carbon double bonds in the PUFA molecules. In addition, two highly reactive dicarbonyls, malondialdehyde (MDA) and glyoxal, were also generated, likely as secondary products. Specific yields relative to reactant loss were 78%, 29%, 4% and < 1% for n-hexanal, 3-nonenal, MDA and glyoxal, respectively, where the yields for MDA and glyoxal are likely lower limits. Heterogeneous oxidation of SML samples confirm for the first time that similar carbonyl products are formed via ozonolysis of environmental samples.

ChemInform Abstract: Palladium-Catalyzed Decarbonylative Dehydration of Fatty Acids for the Production of Linear Alpha Olefins.

ChemInform ◽  
2014 ◽  
Vol 45 (31) ◽  
pp. no-no ◽  
Author(s):  
Yiyang Liu ◽  
Kelly E. Kim ◽  
Myles B. Herbert ◽  
Alexey Fedorov ◽  
Robert H. Grubbs ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Palladium Catalyzed ◽  
Alpha Olefins

scholarly journals Influence of Gas Phase Plasma and High Power Ultrasound on Fatty Acids in Goat Milk

2016 ◽  
Vol 11 (4) ◽  
pp. 125-133
Author(s):  
Anita Juric ◽  
Ivancica Delas ◽  
Tomislava Vukusic ◽  
Slobodan Milosevic ◽  
Anet Rezek Jambrak ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Gas Phase ◽  
High Power ◽  
Goat Milk ◽  
Power Ultrasound ◽  
High Power Ultrasound
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