Hollow fiber-based liquid-phase microextraction combined with on-line sweeping for trace analysis of Strychnos alkaloids in urine by micellar electrokinetic chromatography

Recent developments in modifying polypropylene hollow fibers for sample preparation

“…Due to its low cost, low carry-over effect, low organic-solvent consumption, better sample enrichment and clean-up function, PPHFs are usually used in HF liquid-phase microextraction (HF-LPME) for the protection of microdroplets of extraction solvents, and proved to be practical for the treatment of samples in various areas of study [9,10]. However, compared with the normal SPME, the surface area of HF and the partition coefficient in LPME are relatively small.…”

Two-phase/Three-phase Hollow Fibre Liquid-Phase Simultaneous Microextraction Combined with HPLC for Analysis of Phenolic Acids and Flavonoids in Traditional Chinese Medicine

“…A weak acid in acidic donor phase medium, weak alkali in alkaline donor phase medium or neutral substances and compounds with high solubility in a nonpolar organic solvent acceptor phase can be extracted by 2p-HF-LPME. Enriched target analytes in organic or aqueous acceptor phases are directly or indirectly compatible with HPLC [14], gas chromatography (GC) [15,16] or capillary electrophoresis (CE) [17,18] for final chemical analysis.…”

Application of cold-induced aggregation microextraction as a fast, simple, and organic solvent-free method for the separation and preconcentration of Se(IV) in rice and various water samples

“…Furthermore, large amounts of high purity organic solvents, which are potentially toxic and expensive, are usually consumed. Therefore, numerous research efforts in separation science and related fields have been focused on the development of new sample preparation techniques, which are less time consuming, more effective, simple, and fast and require smaller amounts of organic solvents (Raynie 2004;Wang et al 2007a). Considering this aspect, for reducing the number of steps in analysis, increasing the sample throughput, and improving the quality and the sensitivity of the analytical methods, several microextraction techniques such as cloud point extraction (CPE) (Chen and Teo 2001), homogeneous liquid-liquid extraction (HLLE) (Ebrahimzadeh et al 2007), liquid-phase microextraction (LPME) (Ahmadi et al 2006), and solid-phase microextraction (SPME) (Djozan et al 2001) have been developed.…”