title: Determination of preservatives in soft drinks by capillary electrophoresis with ionic liquids as the electrolyte additives.
abstract: A capillary electrophoresis method for separating preservatives with various ionic liquids as the electrolyte additives has been developed. The performances for separation of the preservatives using five ionic liquids with different anions and different substituted group numbers on imidazole ring were studied. After investigating the influence of the key parameters on the separation (the concentration of ionic liquids, pH, and the concentration of borax), it has been found that the separation efficiency could be improved obviously using the ionic liquids as the electrolyte additives and tested preservatives were baseline separated. The proposed capillary electrophoresis method exhibited favorable quantitative analysis property of the preservatives with good linearity (r(2) = 0.998), repeatability (relative standard deviations ≤ 3.3%) and high recovery (79.4-117.5%). Furthermore, this feasible and efficient capillary electrophoresis method was applied in detecting the preservatives in soft drinks, introducing a new way for assaying the preservatives in food products.
authors.affiliation: Beijing National Laboratory for Molecular Sciences, Key Lab of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing, P.R. China; College of Food Sciences and Engineering, Shandong Agricultural University, Tai'an, P.R. China.
authors.forename: Bingbing
authors.initials: B
authors.lastname: Sun
authors.forename: Li
authors.initials: L
authors.lastname: Qi
authors.forename: Minglin
authors.initials: M
authors.lastname: Wang
mesh_terms: D000838:Anions; D002021:Buffers; D002253:Carbonated Beverages / Q000032:analysis*; D004573:Electrolytes; D019075:Electrophoresis, Capillary; D005504:Food Analysis / Q000379:methods*; D005520:Food Preservatives / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007093:Imidazoles / Q000737:chemistry; D052578:Ionic Liquids / Q000737:chemistry*; D007477:Ions; D015203:Reproducibility of Results; D013237:Stereoisomerism
chemical_list: D000838:Anions; D002021:Buffers; D004573:Electrolytes; D005520:Food Preservatives; D007093:Imidazoles; D052578:Ionic Liquids; D007477:Ions
keywords: Capillary electrophoresis; Electrolyte additives; Ionic liquids; Preservatives; Soft drinks