A new analytical method based on vortex-assisted liquid-liquid microextraction with back extraction (VALLME-BE) coupled high performance liquid chromatography was developed for the simultaneous determination of antidiabetic drugs; repaglinide, glibenclamide, and glimepiride in water samples. Chromatographic separation achieved using C18 column (250 × 4.6 mm 5 µm) methanol-phosphate buffer (pH3....

A new, simple, rapid, sensitive and environmentally friendly ultrasound-assisted emulsification dispersive liquid–liquid microextraction (UAE-DLLME) has been developed for trace nickel Ni(II) separation preconcentration in environmental samples prior to spectrophotometric determination. The proposed method based on using non-ionic water-soluble surfactant Triton X-114 (TX-114) as a disperser so...

A new method for the determination of cobalt was developed by dispersive liquid-liquid microextraction preconcentration and flame atomic absorption spectrometry. In the proposed approach, 1,5-bis(di-2-pyridyl) methylene thiocarbohydrazide (DPTH) was used as a chelating agent, and chloroform and ethanol were selected as extraction and dispersive solvents. Some factors influencing the extraction ...

background and objectives: furfural (f) and hydroxymethyl furfural (hmf) are cyclic aldehydes, which are formed during the heat processing of foods. these chemical contaminants have received much attention due to their suspected health hazards and heat damage indicators. the aim of the present study was extraction and determination of f and hmf in baby-foods using dispersive liquid-liquid micro...

dispersive liquid liquid microextraction (dllme) combined with gas chromatography–mass spectrometry (gc–ms) was used for the extraction and determination of 13 polycyclic aromatic hydrocarbons (pahs) in mineral water samples. in this procedure, the suitable combination of extraction solvent (500 µl chloroform) and disperser solvent (1000 µl acetone) were quickly injected into the water sample (...

a new simple and rapid dispersive liquid-liquid microextraction has been applied to preconcentrate tracelevels of zinc as a prior step to its determination by spectrophotometric method. in the proposed method, 4-(2-pyridylazo) resorcinol (par) is used as a chelating agent, and chloroform and ethanol are selected asextraction and dispersive solvent. the optimization strategy is carried out by us...

A green and fast sample preparation method based on reversed-phase dispersive liquid–liquid microextraction was developed for the separation preconcentration of several elements in gasoline samples before ICP-OES determination.

The extraction efficiency of stimulant drug, namely caffeine, was investigated using a 23 central composite design. values optimum condition were set at 468 ?L 1-dodecanol, 1 piece effervescent tablet, and 22 °C temperature. An enrichment factor calculated as 72 for 80 mL water sample. run time conducted in less than 6 min non-polar C18 column an isocratic mobile phase (methanol: 40:60 (v/v)) c...