The conditions of heating, ionic liquid-based ultrasonic-assisted extraction combined with reverse-phase high performance liquid chromatography were optimized to simultaneously isolate and determinate brazilin and protosappanin B in Caesalpinia sappan. Ionic liquids, including [BMIM]Br, [BMIM]BF4, [BMIM]PF6 and [HMIM]PF6, were selected as extraction solvents while methanol, acetone, acetonitril...

Dispersive liquid-liquid microextraction (DLLME) coupled with high-performance liquid chromatography-variable wavelength detector (HPLC-VWD) was developed for extraction and determination of thiamphenicol (THA) in honey. A mixture of extraction solvent (30 microL 1,1,2,2-tetrachloroethane) and dispersive solvent (1.0 mL of acetonitrile) was rapidly injected into 5.00 mL sample solution for the ...

The direct coupling of in-tube solid-phase microextraction (in-tube SPME) with microcolumn liquid chromatography (micro-LC) has been investigated for the analysis of antidepressants in human urine. The use of in-tube SPME has been clearly shown to be advantageous for the on-line coupling of the SPME method, as the sample pretreatment technique, with micro-LC as the separation technique. This is...

A review. In this paper, separation of metals with solvent extraction, ionic liquid extraction phase and chelate extraction of metal ion were reviewed.

Liquid-liquid extraction or solid-phase extraction followed by gas chromatography (GC) or high-performance liquid chromatography are traditional herbicide residue determination methods for environmental samples. Solid-phase microextraction (SPME) is a solventless, fast, and sensitive alternative herbicide residue extraction method that can be applied to numerous environmental matrices. The obje...

a simple and sensitive method has been developed for the preconcentration and determination of trace level of co(ii) using uv-vis spectrophotometry. β-cyclodextrin polymer modified with 1-(2-pyridylazo)-2-naphthol (pan) is used for the preconcentration of co(ii) from samples at ph 8.5. the polymer is synthesized and characterized using elemental analysis, ft-ir and sem analysis. the factors aff...

Liquid phase-based microextraction techniques (LPµETs) have attracted great attention from the scientific community since their invention and implementation mainly due to high efficiency, low solvent sample amount, enhanced selectivity precision, good reproducibility for a wide range of analytes. This review explores different possibilities applications LPμETs including dispersive liquid–liquid...

In most cases, herbal supplements found in illegal centers and medicine stores have harmful content that causes irreparable damage to people. As a representative of the green chemistry method, rapid efficient dispersive micro solid-phase extraction (D-mSPE) method was applied extract dexamethasone adulterant from handmade sold as power natural enhancing materials. The quantification analyte per...

Validation experiments were conducted of a simple, fast and inexpensive method for the determination of 71 pesticides fortified at 0.006 2 mg/kg in dried herbs samples (caraway, dry mint and chamomile matrices). The method is known as the quick, easy, cheap, effective, rugged and safe (QuEChERS) method for pesticide residues in herbs. The procedure involved the extraction of samples with water ...

This review aims to provide an overview of homogeneous liquid-liquid extraction (HLLE) and dispersive liquid-liquid microextraction (DLLME) methods and their potential use in inorganic analysis. Relevant applications to the determination of metal ions, metalloids and organometals are included. The phase separation mechanisms of these unconventional solvent extraction techniques are discussed. T...