title: Rapid analysis of water- and fat-soluble vitamins by electrokinetic chromatography with polymeric micelle as pseudostationary phase.
abstract: A novel polymeric micelle, formed by random copolymer poly (stearyl methacrylate-co-methacrylic acid) (P(SMA-co-MAA)) has been used as pseudostationary phase (PSP) in electrokinetic chromatography (EKC) for simultaneous and rapid determination of 11 kinds of water- and fat-soluble vitamins in this work. The running buffer consisting of 1% (w/v) P(SMA-co-MAA), 10% (v/v) 1-butanol, 20% (v/v) acetonitrile, and 30 mM Palitzsch buffer solution (pH 9.2) was applied to improve the selectivity and efficiency, as well as to shorten analysis time. 1-Butanol and acetonitrile as the organic solvent modifiers played the most important roles for rapid separation of these vitamins. The effects of organic solvents on microstructure of the polymeric micelle were investigated. The organic solvents swell the polymeric micelle by three folds, lower down the surface charge density and enhance the microenviromental polarity of the polymeric micelle. The 11 kinds of water- and fat-soluble vitamins could be baseline separated within 13 min. The method was applied to determine water- and fat-soluble vitamins in commercial vitamin sample; the recoveries were between 93% and 111% with the relative standard derivations (RSDs) less than 5%. The determination results matched the label claim.
authors.affiliation: The Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, PR China.
authors.forename: Xinjiong
authors.initials: X
authors.lastname: Ni
authors.affiliation: Chemical and Biological Engineering College, Yancheng Institute of Technology, Yancheng 224051, PR China.
authors.forename: Xiaoping
authors.initials: X
authors.lastname: Xing
authors.affiliation: The Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, PR China. Electronic address: yuhuacao64@gmail.com.
authors.forename: Yuhua
authors.initials: Y
authors.lastname: Cao
authors.affiliation: The Key Laboratory of Food Colloids and Biotechnology, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, PR China.
authors.forename: Guangqun
authors.initials: G
authors.lastname: Cao
mesh_terms: D020374:Chromatography, Micellar Electrokinetic Capillary / Q000295:instrumentation / Q000379:methods*; D005223:Fats / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D057230:Limit of Detection; D011108:Polymers; D015203:Reproducibility of Results; D012995:Solubility; D012997:Solvents / Q000032:analysis; D013696:Temperature; D013997:Time Factors; D014815:Vitamins / Q000032:analysis*; D014867:Water / Q000737:chemistry
chemical_list: D005223:Fats; D011108:Polymers; D012997:Solvents; D014815:Vitamins; D014867:Water
keywords: Microstructure; Organic solvent modifier; Polymeric micelle; Vitamins