The mass transport of ethyl acetate in syndiotactic polystyrene (sPS) has been studied. Two groups of specimens were prepared using press-cooling and water-quenching. The press-cooled and water-quenched specimens were identified as crystalline and amorphous structures, respectively, by X-ray ...
ethyl acetate extractionoctylglucosideDetergents are required for the extraction of hydrophobic proteins and for the maintenance of their solubility in solution. However, the presence of detergents in the peptide samples severely suppresses ionization in mass spectrometry (MS) analysis and decreases ...
After the reaction, the sample was dissolved in 0.5 ml of hexane/acetic acid (50:1, v/v) and the mixture was applied to InertSep SI cartridge, which had been successively conditioned with 3 mL of ethyl acetate and 3 mL of hexane. The cartridge was washed with 1 mL of ...
Similar procedures were repeated using ethyl acetate and 1% acetic acid (v:v; LLE-2), ethyl acetate and 1% ammonium hydroxide (v:v; LLE-3) instead of ethyl acetate. Extracts were analyzed using ultra-high performance liquid chromatography–tandem mass-spectrometry (UHPLC-MS/MS). Solid-phase...
[2H5]-labeled standards. Sample preparation consisted of a two-stepsolid phase extractionwith a C18 cartridge usingacetonitrileaseluentand a silica cartridge using 20%ethyl acetateinn-hexane as eluent. LC measurement was performed on a ProminenceUFLCXR chromatographic system (Shimadzu) with a Pursuit...
The coupling system gave an excellent separation of ethyl acetate extract from the seeds of O. indicum using a solvent system composed of hexane‐ethyl acetate‐methanol‐0.2% formic acid (1:1.2:1:1); the online data of APCI‐MS and APCI‐MS‐MS provided useful information for the ...
Extraction of sample used less solvent quantity as compared to other methods used for pesticide extraction from cardamom matrix. Cleanup with GCB and C18 helped to remove matrix co-extracts such as pigments and essential oils. Solvent exchange from acetonitrile to ethyl acetate helped to reduce the...
Recovery of terbutaline and internal standard into ethyl acetate is effected at pH 9.8, while back-extraction into dilute acid serves to purify the initial extract. Following preparation of O-TMS, N-TFA derivatives, the drug and its homologue are detected by selected ion monitoring of their ...
PLE in a multiple-step procedure consisting of sequential use of ethyl acetate–dimethylformamide and methanol–phosphoric acid resulted in the most efficient extraction procedure. Quantitative analyses of the fluorinated anionic perfluorooctanesulfonate (PFOS) and the partly fluorinated non-ionic alkyl...
For the analysis of ticagrelor, its metabolites and the internal standard (IS) plasma samples were processed by liquid-liquid extraction using ethyl acetate and urine was processed by protein precipitation. Separations were performed on an Ultimate XB-C18 column (2.1 mm × 150 mm, 3 μm), ...