Apple juice samples intended for infants purchased in Navarra (Spain) have been analyzed for PAT occurrence. Two capillary electrophoresis methods, based on a MEKC and a CEC system, and an HPLC method were evaluated for the aforementioned study. The CEC system gave less satisfying separations and several practical problems, so samples have been analyzed by MEKC and HPLC. Both methods have been ...

Abstract This study establishes a method for rapid detection of clonidine and cyproheptadine in foods animal origin. In order to obtain the best method, capillary zone electrophoresis (CZE), large volume sample stacking (LVSS), sweeping-micellar electrokinetic chromatography (sweeping-MEKC) were used respectively. The limits (LODs) by LVSS-CZE 0.028 ?g mL ?1 0.034 , those sweeping-MEKC 0.023 0....

We have employed a rapid and highly efficient on-line preconcentration method, cation-selective exhaustive injection and sweeping micellar electrokinetic chromatography (CSEI-sweeping-MEKC), for the analysis of selective serotonin reuptake inhibitors (SSRIs) of antidepressant drugs. We monitored the effects of several of the CSEI-sweeping-MEKC parameters - including the pH, the concentrations o...

A new phenylalanine derivative (L-N-(2-hydroxy-propyl)-phenylalanine, L-HP-Phe) was synthesized and its chelate with Cu(II) (Cu(II)-(L-HP-Phe)(2)) was used as the chiral selector for the ligand-exchange (LE) chiral separation of D,L-selenomethionine (SeMet) in selenized yeast samples by micelle electrokinetic capillary chromatography (MEKC). In order to improve the sensitivity of MEKC-UV, two-s...

Objectives: The effect of methanolic extract of Kalanchoe crenata (MEKC) was investigated on renal morphology and function in adriamycininduced kidney impairment in rats. Methods: Ether anesthetized rats received three intravenous injections (days 0, 14, 28) of 2 mg/kg body weight of adriamycin. Repeated doses of the extract (0, 50 and 68 mg/kg bw) and losartan (10 mg/kg bw) were administered o...

The separation and on-line concentrations of lysergic acid diethylamide (LSD), iso-lysergic acid diethylamide (iso-LSD) and lysergic acid N,N-methylpropylamide (LAMPA) in human urine were investigated by capillary electrophoresis-fluorescence spectroscopy using sodium dodecyl sulfate (SDS) as an anionic surfactant. A number of parameters such as buffer pH, SDS concentration, Brij-30 concentrati...

Um método cromatográfico eletrocinético micelar modificado por ciclodextrina (CD-MEKC) foi desenvolvido para separar e determinar ácido betulínico (BA), ácido oleanólico (OA) e ácido ursólico (UA) usados na medicina tradicional Chinesa (TCMs). Três triterpenos pentacíclicos ácidos foram separados em tampão (pH 9,0) de metanol 6% (v/v), contendo 10 mmol L de tetraborato dissódico, 10 mmol L de h...

In this study, I separated gold nanoparticles (Au NPs) using the reversed electrode polarity stacking mode (REPSM) of a capillary electrophoresis system for on-line enhancement prior to performing micellar electrokinetic chromatography (MEKC). In the first part of this paper, I discuss the effects of several new and important parameters, the nature of the added salt, the pH of the sample matrix...

In this work, different extracts from the microalga Spirulina platensis are obtained using Accelerated Solvent Extraction (ASE) and four different solvents (hexane, petroleum ether, ethanol and water). Different extraction temperatures (115oC and 170oC) were tested using extraction times ranging from 9 to 15 minutes. The antioxidant activity of the different extracts is determined by means of a...