A new method for the determination of trans-resveratrol in grape seed was developed by coupling liquid extraction (LE) and micellar electrokinetic chromatography (MEKC). LE was employed for sample preparation and MEKC for analytical separation. The solvent used for LE was ethyl acetate and the buffer for MEKC consisted of 25 mM borate containing 25 mM sodium dodecyl sulfate (SDS) and 2.5 mM sodium salt sulfated-β-cyclodextrin at pH 9.0. The limit of detection (S/N = 3) was found to be 4.62 × 10−7 g ml−1. Linear regression of peak area versus concentration of resveratrol was checked with the r squared being greater than 0.99 for resveratrol at a concentration range of 9.25 × 10−6 g ml−1 to 4.63 × 10−2 g ml−1. The recoveries were over 90% for the determination of resveratrol in grape seed samples. The method developed can be an attractive alternative to the HPLC methods reported in the literature for the determination of resveratrol in grape seed with the advantages of a reduction of analysis time and operation cost. To the best of our knowledge, this is the first report on the determination of resveratrol in grape seed based on coupling LE and MEKC.

An extraction technique for analytical sample preparation in aqueous solution has been developed based on controlling dispersion of ionic surfactant assemblies. An extraction technique was realized based on controlling dispersion of the ionic surfactant assemblies in their isotachophoretic migration during the extraction by arranging the solutions of leading electrolyte, ionic surfactant and terminating electrolyte in order and applying voltage. Potential of the technique for analytical sample preparation in aqueous solution has been demonstrated by extracting a model sample of four alkylphenones, which were analyzed by HPLC after the extraction. The extraction showed concentration effects on all the four alkylphenones of butyrophenone, valerophenone, hexanophenone and heptanophenone in the model sample. The enrichment factors were 5.29, 7.70, 7.25 and 7.49 for the four alkylphenones of butyrophenone, valerophenone, hexanophenone and heptanophenone, respectively. Linear relationship was obtained with all the four alkylphenones between their chromatographic peak areas before and after the extraction in the range of concentration from 0.05 ppm to 1.5 ppm. The RSD of the chromatographic peak areas in triplicate extractions was 7.97%, 3.75%, 2.91% and 4.45% for butyrophenone, valerophenone, hexanophenone and heptanophenone, respectively. Advantages of the extraction technique developed include ease of operation, low reagent cost, no consumption of organic solvents and no requirement for additional phase separation.

Both the reduced form of glutathione (GSH) and the oxidized form of glutathione (GSSG) in eel’s (Monopterus albus) plasma were for the first time determined by transient pseudoisotachophoresis coupled with capillary zone electrophoresis. The method of transient pseudoisotachophoresis coupled with capillary zone electrophoresis has been thoroughly optimized and adequately evaluated for the simultaneous determination of GSH and GSSG in eel’s plasma. The detection limits (S/N = 3) of the method developed were 0.2 and 0.05 µmol/L for GSH and GSSG, respectively. The linearity of the calibration curves was valid in the range of 0–10 µmol/L GSH and 0–0.70 µmol/L GSSG. The method was simple, fast, and reproducible. It was found that the respective concentrations of GSH and GSSG were in the range of 9.1−14.5 and 0.31−0.58 µmol/L in the adult eel’s plasma, and 10.8−17.9 and 0.49 – 0.68 µmol/L in the juvenile eel’s plasma of the three populations determined. Each blood sample was a composite of five eels. For each of the three populations, the concentrations of GSH and GSSG in the adult eel’s plasma were lower than those in the juvenile eel’s plasma, and the concentrations of GSH and GSSG in the plasma of population 1 (deep yellow finless eels) were higher than those in populations 2 (light yellow finless eels) and 3 (green finless eels) for either the adult or the juvenile eels.

A new method for the determination of trans-resveratrol in grape seed was developed by coupling liquid extraction (LE) and micellar electrokinetic chromatography (MEKC). LE was employed for sample preparation and MEKC for analytical separation. The solvent used for LE was ethyl acetate and the buffer for MEKC consisted of 25 mM borate containing 25 mM sodium dodecyl sulfate (SDS) and 2.5 mM sodium salt sulfated-β-cyclodextrin at pH 9.0. The limit of detection (S/N = 3) was found to be 4.62 × 10−7 g ml−1. Linear regression of peak area versus concentration of resveratrol was checked with the r squared being greater than 0.99 for resveratrol at a concentration range of 9.25 × 10−6 g ml−1 to 4.63 × 10−2 g ml−1. The recoveries were over 90% for the determination of resveratrol in grape seed samples. The method developed can be an attractive alternative to the HPLC methods reported in the literature for the determination of resveratrol in grape seed with the advantages of a reduction of analysis time and operation cost. To the best of our knowledge, this is the first report on the determination of resveratrol in grape seed based on coupling LE and MEKC.