title: Determination of phthalic acid esters in Chinese white spirit using dispersive liquid-liquid microextraction coupled with sweeping β-cyclodextrin-modified micellar electrokinetic chromatography.
abstract: A simple method that consumes low organic solvent is proposed for the analysis of phthalic acid esters in Chinese white spirit using dispersive liquid-liquid microextraction coupled with sweeping-micellar electrokinetic chromatography. Tetrachloromethane and white-spirit-containing ethanol were used as the extraction and dispersing solvents, respectively. The electrophoresis separation buffer was composed of 5 mM β-cyclodextrin, 50 mM sodium dodecyl sulfate and 25 mM borate buffer (pH 9.2) with 9% acetonitrile, enabling the baseline resolution of the analytes within 13 min. Under the optimum conditions, satisfactory linearities (5-1000 ng/mL, r ≥ 0.9909), good reproducibility (RSD ≤ 6.7% for peak area, and RSD ≤ 2.8% for migration time), low detection limits (0.4-0.8 ng/mL) and acceptable recovery rates (89.6-105.7%) were obtained. The proposed method was successfully applied to 22 Chinese white spirits, and the content of dibutyl phthalate in 55% of the samples exceeded the Specific Migration Limit of 0.3 mg/kg established by the domestic and international regulations.
authors.affiliation: College of Science, Northwest A&F University, Yangling, China.
authors.forename: Jianzhi
authors.initials: J
authors.lastname: Sun
authors.forename: Hui
authors.initials: H
authors.lastname: He
authors.forename: Shuhui
authors.initials: S
authors.lastname: Liu
mesh_terms: D001628:Beverages / Q000032:analysis*; D004571:Electrokymography / Q000295:instrumentation / Q000379:methods*; D004952:Esters / Q000032:analysis* / Q000302:isolation & purification*; D005506:Food Contamination / Q000032:analysis; D059627:Liquid Phase Microextraction / Q000379:methods*; D010795:Phthalic Acids / Q000032:analysis* / Q000302:isolation & purification*
chemical_list: D004952:Esters; D010795:Phthalic Acids
keywords: Chinese White Spirit; Dispersive liquid-liquid microextraction; Micellar electrokinetic chromatography; Phthalic acid esters; Sweeping