methyl acetate/dichloromethane

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[Determination of the thermodynamic parameters of ionic liquid 1-hexyl-3-methylimidazolium tetrafluoroborate by inverse gas chromatography].

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Inverse gas chromatography (IGC) was used to characterize the thermodynamic properties of ionic liquid (IL) 1-hexyl-3-methylimidazolium tetrafluoroborate ([HMIM] BF4) in the temperature range from 343.15 K to 373. 15 K. A series of solvents with different chemical natures were used to determine the

[Determination of thermodynamic parameters for ionic liquid 1-hexyl-3-methylimidazolium trifluoromethansulfonate by inverse gas chromatography].

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The thermodynamic parameters of ionic liquid 1-hexyl-3-methylimidazolium trifluoromethansulfonate ([HMIM] OTF) were investigated by inverse gas chromatography in the temperature range of 343.15-373.15 K. Eighteen probe solvents were used to calculate the molar enthalpy of sorption, molar enthalpy of

The oxidation products of crude mesobilirubinogen.

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Bile pigment esters were separated by ascending t.l.c. Apparently pure pigments, obtained by ferric chloride oxidation of crude mesobilirubinogen, derived from commercial bilirubin by reduction with sodium amalgam, were shown to be complex mixtures. Successive chromatography of their dimethyl esters

Determination of the solubility parameter of ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate by inverse gas chromatography.

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Thermodynamic properties of ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM] BF4) were determined via inverse gas chromatography (IGC). Two groups of solvents with different chemical natures and polarities were used to obtain information about [BMIM] BF4-solvent interactions. The

A method for detecting breakthrough of organic solvent vapors in a charcoal tube using semiconductor gas sensors.

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This study developed a method for detecting organic vapors that break through charcoal tubes, using semiconductor gas sensors as a breakthrough detector of vapors. A glass column equipped with two sensors was inserted in Teflon tubing, and air containing organic vapor was introduced at a constant

Thermal reconditioning characteristics of a respirator cartridge for organic vapors using humid air as the desorption gas.

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OBJECTIVE Thermal reconditioning characteristics of organic vapors from a respirator cartridge were studied by introducing humid air into a cartridge that had adsorbed organic vapors in order to develop a thermal reconditioning method. METHODS Five different organic vapors (methanol, 2-propanol,

Breakthrough times for vapors of organic solvents with low boiling points in steady-state and pulsating flows on respirator cartridges.

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The breakthrough times of five organic solvents at various vapor concentrations were measured in steady-state and pulsating flows on commercially available respirator cartridges. The relationship between the logarithmic vapor concentration and the logarithmic breakthrough time of each organic

Sensitive method for determination of nicorandil in human plasma by reversed-phase high-performance liquid chromatography with ultraviolet detection.

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A sensitive method for the determination of nicorandil, an anti-anginal drug, has been developed. The method involves solid-phase extraction of the drug and an internal standard using a Bond-Elut PH extraction column, liquid-liquid extraction with methyl acetate and dichloromethane, and

UHPLC-MS Metabolome Fingerprinting: The Isolation of Main Compounds and Antioxidant Activity of the Andean Species Tetraglochin ameghinoi (Speg.) Speg.

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The seriated extracts of petroleum ether (PE-E), dichloromethane (DCM-E) and methanol extracts (MeOH-E) from the aerial parts of the native South American plant Tetraglochin ameghinoi (Rosaceae), were evaluated regarding their antioxidant and antibacterial activities. The antioxidant properties were

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