title: Determination of synthesized alpha-vitamin E by micellar electrokinetic chromatography.
abstract: We developed a micellar electrokinetic chromatography method (MEKC) for the direct determination of the content of synthesized alpha-vitamin E. It was found that under the optimum separation conditions 7 mM borate + 14 mM phosphate + 15 mM sodium dodecyl sulfate (SDS) + 10 mM sodium cholate (NaCh) + 8% acetonitrile (pH 9.2) with UV detection wavelength at 214 nm, 16 kV constant voltage, and 26 degrees C constant temperature, alpha-vitamin E and its isomers can be baseline separated and alpha-vitamin E was quantitatively analyzed. In addition, the sample recovery, the limit of detection and the repeatability of the method were investigated. The influence of various parameters on the separation such as SDS concentration, NaCh concentration, buffer pH and acetonitrile percentage were also discussed.
authors.affiliation: Department of Chemistry, Hebei University, Baoding 071002, China.
authors.forename: J
authors.initials: J
authors.lastname: Zhao
authors.forename: G
authors.initials: G
authors.lastname: Yang
authors.forename: H
authors.initials: H
authors.lastname: Duan
authors.forename: J
authors.initials: J
authors.lastname: Li
mesh_terms: D000097:Acetonitriles / Q000737:chemistry; D020374:Chromatography, Micellar Electrokinetic Capillary / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D015394:Molecular Structure; D020358:Sodium Cholate; D012967:Sodium Dodecyl Sulfate; D014810:Vitamin E / Q000032:analysis* / Q000138:chemical synthesis
chemical_list: D000097:Acetonitriles; D014810:Vitamin E; D012967:Sodium Dodecyl Sulfate; D020358:Sodium Cholate; C032159:acetonitrile