Micellar electrokinetic chromatography (MEKC), which can separate neutral analytes as well as charged analytes by the capillary electrophoretic technique, was developed in 1982 and the first paper was published in 1984. The authors’ group concentrated their effort into the characterization of MEKC as a separation technique until early 1990s. Most issues in MEKC separations were successfully sol...

Differential pulse voltammetry (DPV) and adsorptive stripping voltammetry (AdSV) at a hanging mercury drop electrode (HMDE) was used for the determination of trace amounts of carcinogenic nitrobiphenyls, namely 2-nitrobiphenyl (2-NBP), 3nitrobiphenyl (3-NBP) and 4-nitrobiphenyl (4-NBP) within the concentration range from 2.10 to 1.10 mol⋅L for DPV and from 2.10 to 1.10 mol⋅L for AdSV using a Br...

A rapid and sensitive chemiluminescence microfluidic immunoassay system based on super-paramagnetic microbeads for determination of alpha-fetoprotein (AFP) is described. In this system we use CO(2) laser to fabricate microfluidic chip, and use super-paramagnetic microbeads as solid carrier of antibody, chemiluminescence as detection signal. With this system we can perform AFP analysis within 20...

The review article is devoted mainly to the description of applications of gold nanoparticles (GNPs) in separation sciences, especially in electromigration and chromatographic techniques. The applications of GNPs in particular separation methods, CE, microchip CE, MEKC, CEC, HPLC and GC, are classified according to the molecular size of the analytes from low-molecular-mass compounds via medium ...

Chrysophanol (Chry, Figure 1), 1,8-dihydroxy-3methylanthraquinone, is a free anthraquinone compound and a secondary metabolite of medicinal plant rhubarb. Chry has been reported to have many pharmacological effects such as anti-inflammatory activity [1], anti-microbial activity [2] and anti-cancer action [3]. Therefore, the detection of Chry is quite important and interesting. Until now, variou...

A separation and preconcentration method has been developed for traces of heavy metals using coagulation of colloidal silica. An appropriate amount of colloidal silica was added to a sample solution, the pH was adjusted to 11 with tetramethylammonium hydroxide solution and calcium chloride solution was then added to coagulate the silica. The coagulated silica and solution were separated by cent...

This article presents an overview of our recent progress on the development of chelating materials. Carboxymethylated pentaethylenehexamine (CM-PEHA) and polyethyleneimine (CM-PEI) as chelating ligands show excellent performance for the solid-phase extraction of trace elements. Chelating resins immobilizing these ligands can be readily prepared by immobilizing PEHA and PEI on methacrylate resin...

A redox species was extracted from water (50 x 10(-6) dm3) into a single micro-oil-droplet (30 x 10(-12) dm3) in contact with a microelectrode using microcapillary injection and manipulation techniques. Further, an in situ microanalysis of the solute in a single oil droplet was demonstrated by differential pulse voltammetry. The redox species of 10(-16) mol concentrated in the droplet could be ...