title: Ultrasound-assisted dispersive liquid-liquid microextraction based on the solidification of a floating organic droplet followed by gas chromatography for the determination of eight pyrethroid pesticides in tea samples.
abstract: A novel ultrasound-assisted dispersive liquid-liquid microextraction based on solidification of floating organic droplet method (UA-DLLME-SFO) combined with gas chromatography (GC) was developed for the determination of eight pyrethroid pesticides in tea for the first time. After ultrasound and centrifugation, 1-dodecanol and ethanol was used as the extraction and dispersive solvent, respectively. A series of parameters, including extraction solvent and volume, dispersive solvent and volume, extraction time, pH, and ultrasonic time influencing the microextraction efficiency were systematically investigated. Under the optimal conditions, the enrichment factors (EFs) were from 292 to 883 for the eight analytes. The linear ranges for the analytes were from 5 to 100μg/kg. The method recoveries ranged from 92.1% to 99.6%, with the corresponding RSDs less than 6.0%. The developed method was considered to be simple, fast, and precise to satisfy the requirements of the residual analysis of pyrethroid pesticides.
authors.affiliation: School of Pharmaceutical Engineering, Shenyang Pharmaceutical University, Shenyang 110016, China. Electronic address: houxiaohong_syphu@163.com.
authors.forename: Xiaohong
authors.initials: X
authors.lastname: Hou
authors.affiliation: School of Pharmaceutical Engineering, Shenyang Pharmaceutical University, Shenyang 110016, China.
authors.forename: Xin
authors.initials: X
authors.lastname: Zheng
authors.affiliation: School of Pharmaceutical Engineering, Shenyang Pharmaceutical University, Shenyang 110016, China.
authors.forename: Conglu
authors.initials: C
authors.lastname: Zhang
authors.affiliation: School of Pharmaceutical Engineering, Shenyang Pharmaceutical University, Shenyang 110016, China.
authors.forename: Xiaowei
authors.initials: X
authors.lastname: Ma
authors.affiliation: School of Pharmaceutical Engineering, Shenyang Pharmaceutical University, Shenyang 110016, China.
authors.forename: Qiyuan
authors.initials: Q
authors.lastname: Ling
authors.affiliation: School of Pharmacy, Shenyang Pharmaceutical University, Shenyang 110016, China. Electronic address: longshanzhao@163.com.
authors.forename: Longshan
authors.initials: L
authors.lastname: Zhao
mesh_terms: D002849:Chromatography, Gas / Q000379:methods*; D057230:Limit of Detection; D016014:Linear Models; D059627:Liquid Phase Microextraction / Q000379:methods*; D010573:Pesticide Residues / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification; D010575:Pesticides / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification; D011722:Pyrethrins / Q000032:analysis* / Q000737:chemistry / Q000302:isolation & purification; D015203:Reproducibility of Results; D013010:Sonication; D013662:Tea / Q000737:chemistry*
chemical_list: D010573:Pesticide Residues; D010575:Pesticides; D011722:Pyrethrins; D013662:Tea
keywords: Dispersive liquid–liquid microextraction; Gas chromatography; Pyrethroid pesticides; Solidification of floating organic droplet; Tea