Topic
Hexane
About: Hexane is a research topic. Over the lifetime, 3759 publications have been published within this topic receiving 57996 citations. The topic is also known as: CH3-[CH2]4-CH3 & hexyl hydride.
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TL;DR: In this article, the adsorption behavior of dioctyldimethylammonium chloride at water/hexane interface has been studied by measuring the interfacial tension as a function of temperature and pressure at various bulk concentrations.
Abstract: The adsorption behavior of dioctyldimethylammonium chloride at water/ hexane interface has been studied by measuring the interfacial tension as a function of temperature and pressure at various bulk concentrations. By applying the thermodynamics of adsorption at interfaces to the experimental results, the thermodynamic quantity changes associated with adsorption and the interfacial density of dioctyldimethylammonium chloride have been evaluated.
20 citations
TL;DR: In this paper, the Tsonopoulos correlation equation was used to correlate the experimental data and optimally fitted binary parameters were presented, including an azeotropic point for the binary mixture of cyclohexane + 2-butanol.
Abstract: Vapor−liquid equiliibria were measured at 101.3 kPa for three binary mixtures of 2-butanol + butyl acetate, hexane + butyl acetate, and cyclohexane + 2-butanol. The isobaric T−x−y data were reported, including an azeotropic point for the binary mixture of cyclohexane + 2-butanol. Calculations of the nonideality of the vapor phase were made with the second virial coefficients determined by the Tsonopoulos correlation equation. Various activity coefficient models were used to correlate the experimental data. Satisfactory results were obtained, and optimally fitted binary parameters are presented.
20 citations
TL;DR: In this paper, an enzymatic method was reported for the synthesis of highly pure 2-monoolein by ethanolysis of oleic acid-rich oil, and the effects of solvent type, addition amounts of solvent and lipase, and reaction time on 2-MAGs content in the crude reaction mixture were investigated.
Abstract: It has been reported that 2-monoolein exhibits various biological activities. In this study, an enzymatic method is reported for the synthesis of highly pure 2-monoolein by ethanolysis of oleic acid-rich oil. The effects of solvent type, addition amounts of solvent and lipase, and reaction time on 2-MAGs content in the crude reaction mixture were investigated. Under the optimized conditions, there was 37.6% (area/area) 2-MAGs produced in the crude mixture. 2-MAGs were obtained at 97–98% purity and 33.6% yield (w/w) after fractionation in 85% ethanol aqueous solution and hexane to fully remove impurities including DAGs, TAGs, and fatty acid ethyl esters. Subsequently, 2-MAGs were purified further by two-step crystallization in hexane to remove saturated and polyunsaturated 2-MAGs to obtain pure 2-monoolein. After the two-step crystallization, 97.5% 2-monoolein was obtained at 78.3% yield (w/w). Compared to previous methods, our method for the synthesis of 2-monoolein is easier to scale up, obtain highly pure 2-monoolein product and more economical. In addition, the study on the effect of solvent type suggests that selectivity of the lipase and acyl migration of 2-MAGs may be affected by reaction solvent polarity.
Practical application: Synthetic 2-monoolein can be used as emulsifier and surfactant in food, pharmaceutical and cosmetic and other industries. In addition, 2-monoolein has exhibited strong antioxidation and anti-atherosclerotic properties in vitro and in a cellular model. Thus, 2-monoolein has potential application in treating cardiovascular diseases.
20 citations
TL;DR: In this article, the separation of the optical isomers of fenvalerate [cyano(3-phenoxyphenyl)methyl 2-(4-chlorophenyl)-3-methylbutyrate] has been carried out by high-performance liquid chromatography (HPLC) on a chiral column with (R)-N-3,5-dinitrobenzoyl-phenyl-glycine (DNBPG) covalently bonded on aminopropyl silica and eluted with mixtures of methanol, 2
Abstract: The separation of the optical isomers of fenvalerate [cyano(3-phenoxyphenyl)methyl 2-(4-chlorophenyl)-3-methylbutyrate] has been carried out by high-performance liquid chromatography (HPLC) on a chiral column with (R)-N-3,5-dinitrobenzoyl-phenyl-glycine (DNBPG) covalently bonded on aminopropyl silica and eluted with mixtures of methanol, 2-propanol, and hexane. The system was applied to the analysis of Pydrin®, an emulsifiable concentrate formulation of fenvalerate, and to the residue analysis of fenvalerate in milk samples. For the analysis of Pydrin® the only requirement was the proper dilution of Pydrin® with hexane. For the analysis of residues in milk, fenvalerate was extracted with hexane after precipitating the milk proteins with acetonitrile and removing the precipitate by filtration; the hexane extract was concentrated to small volume and filtered before being analyzed by HPLC.
20 citations
TL;DR: Etude de l'influence de the addition of dodecanol sur la tension interfaciale d'une solution aqueuse de dodecylsulfate de sodium a l'interface eau/hexane.
Abstract: Etude de l'influence de l'addition de dodecanol sur la tension interfaciale d'une solution aqueuse de dodecylsulfate de sodium a l'interface eau/hexane
20 citations