title: Determination of phthalates in food packing materials by electrokinetic chromatography with polymeric pseudostationary phase.
abstract: Polymeric pseudostationary phase (PSP), formed by random copolymer poly (stearyl methacrylate-co-methacrylic acid) (P(SMA-co-MAA)), was used in electrokinetic chromatography (EKC) to separate 15 kinds of phthalates (PAEs). The organic solvent modifier is a key factor for the separation of PAEs. Without organic solvents, only four kinds of PAEs with smaller molecular weight could be separated in the running buffer containing 1% P(SMA-co-MAA). The other eleven kinds of PAEs with larger molecular weight could be separated within 25 min by adding 40% (v/v) methanol and 2% (v/v) 1-butanol in the running buffer. The linear ranges of 15 kinds of PAEs were between 2 and 200mg/L, and the limit of detection based on the ratio of signal to noise of 3 were between 1 and 3mg/L. The method was applied to determination of PAEs in 6 kinds of food packing materials. The recoveries were between 81% and 118% with the RSD less than 4%.
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 / Q000379:methods*; D018857:Food Packaging; D006863:Hydrogen-Ion Concentration; D008823:Micelles; D010795:Phthalic Acids / Q000032:analysis*; D011108:Polymers / Q000737:chemistry; D015203:Reproducibility of Results; D012997:Solvents; D013696:Temperature
chemical_list: D008823:Micelles; D010795:Phthalic Acids; D011108:Polymers; D012997:Solvents
keywords: Food packing materials; Organic solvent modifier; Phthalates; Polymeric pseudostationary phase