Determination of 17 pyrethroid residues in troublesome matrices by gas chromatography/mass spectrometry with negative chemical ionization

Shen, Chongyu; Cao, Xiaowen; Shen, Weijian; Jiang, Yuan; Zhao, Zhenjun; Wu, Bin; Yu, Kaijiang; Han, Ling; Lian, Hong-zhen

doi:10.1016/j.talanta.2010.12.041

Cited by 59 publications

(37 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…60) Recently, the usage of an acidic acetonitrile as an extraction solvent has been reported to inhibit this type of artificial epimerization incompletely in pyrethroids, especially in chili containing a large amount of basic natural compounds, such as capsaicin. 134) Photo-induced isomerization in the cyclopropyl moiety was reported for cypermethrin (14) and its cis-isomers applied to spruce. 135) The change of an isomeric ratio in several Chinese teas was investigated for cypermethrin (14) and cis-bifenthrin (20) by using a chiral GC, but the involvement of enantiomerization before and during processing was not clarified.…”

Section: Enantiomerization In the Environmentmentioning

confidence: 99%

Isomerization of chiral pesticides in the environment

Katagi

2012

J. Pestic. Sci.

View full text Add to dashboard Cite

The most biologically active stereoisomer(s) of a chiral pesticide should be used favorably when stereoisomers exhibit different activities on target species, not only to reduce the unnecessary burden of inactive ones to the environment but also to remove unjustified dietary and ecological risks as possible. However, the isomerization of a chiral pesticide, if it occurs in the environment, deteriorates the advantage of using chirally purified pesticide. The isomerization of a chiral pesticide should be examined in hydrolysis, photolysis, and metabolism in soil and plants to estimate enantioselectivity in its environmental fate and any ecotoxicological effects from the viewpoint of more precise risk assessment.

show abstract

Section: Enantiomerization In the Environmentmentioning

confidence: 99%

Isomerization of chiral pesticides in the environment

Katagi

2012

J. Pestic. Sci.

View full text Add to dashboard Cite

show abstract

“…The extraction time required reaching equilibrium between the IL-linked fiber, and the sample solution was evaluated for periods of 10,20,30,40,50, and 60 min. The analytical signals for most of the pyrethroids reach a relatively stable state after 50 min.…”

Section: Optimization Of Spme Conditionsmentioning

confidence: 99%

“…Gas chromatographic techniques, coupled with mass spectrometry detection (GC-MS) [10,11] and electron capture detection (GC-ECD) [12,13], are usually considered as the best methods to analyze pyrethroids in sample matrices. Before performing a chromatographic analysis, several sample pre-treatments (such as solid-phase extraction (SPE) [14] and liquid-liquid extraction (LLE) [15]) are often required.…”

Section: Introductionmentioning

confidence: 99%

A Novel SPME Fiber Chemically Linked with 1-Vinyl-3-hexadecylimidazolium hexafluorophosphate Ionic Liquid Coupled with GC for the Simultaneous Determination of Pyrethroids in Vegetables

et al. 2012

View full text Add to dashboard Cite

A solid-phase microextraction (SPME) fiber chemically linked with ionic liquid (IL), coupled to gas chromatography-electron capture detector (GC-ECD) technique for the simultaneous sampling and determination of pyrethroids has been developed. A novel ionic liquid, 1-vinyl-3-hexadecylimidazolium hexafluorophosphate (ViHDIm ? PF 6 -), was synthesized and used as SPME fiber material. The IL-linked fiber was applied to the determination of seven pyrethroids in vegetables by direct immersion extraction, followed by gas chromatographic separation and electron capture detection. Important extraction parameters, including extraction temperature, extraction time, stirring rate, desorption temperature and time were carefully optimized. Several experiments were carried out to evaluate the analytical characteristics of the SPME-GC-ECD method under optimum conditions. The limits of detection (LODs) for the seven pyrethroids were between 0.07 and 0.29 lg L -1 . The linearity was from 0.1 to 100 lg L -1 for fenpropathrin, from 0.25 to 100 lg L -1 for cypermethrin, permethrin and deltamethrin, and from 0.5 to 100 lg L -1 for flucythrinate, fenvalerate and fluvalinate. Single fiber and fiber-to-fiber reproducibility, expressed as relative standard deviation, were less than 8.10 and 13.27 %, respectively. Compared with the commercial polydimethyl siloxane (PDMS) fiber, the extraction efficiency of the prepared IL-linked fiber for seven pyrethroids was about 20 % higher than that of PDMS fiber. The established SPME-GC-ECD was successfully applied in the detection of pyrethroids in cabbage and cucumber, with LODs of the seven pyrethroids between 0.21 and 0.49 lg kg -1 and recoveries of between 67.40 and 90.38 % in vegetables.

show abstract

“…This is unfavourable for the detectability, i.e. selectivity and sensitivity, of the compound in question and particularly with these issues chemical ionization (CI) may provide a powerful tool for method development [5][6][7][8][9][10]. CI is a soft ionization technique that generates less extensive fragmentation than EI and thus may retain the pseudomoleculair ion [M + H] + and structural information often lost in EI.…”

Section: Introductionmentioning

confidence: 99%