Capillary electrochromatography for pesticide analysis: Effects of environmental matrices

Cooper, Paul A.; Jessop, K. Michael; Moffatt, Frank

doi:10.1002/(sici)1522-2683(20000501)21:8<1574::aid-elps1574>3.0.co;2-6

Cited by 17 publications

(6 citation statements)

References 16 publications

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“…Several techniques have been developed to bring sensitivity into the realm of HPLC. Thus, in order to enhance sensitivity, analyte stacking was investigated using largevolume injections of aqueous samples [9]. However, this technique resulted in CEC column disequilibration and led to a large increase in retention times.…”

Section: Introductioncontrasting

confidence: 67%

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Microemulsion electrokinetic chromatography versus capillary electrochromatography-UV-mass spectrometry for the analysis of flunitrazepam and its major metabolites

et al. 2002

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Benzodiazepines, namely flunitrazepam and its three major metabolites, were successfully separated by microemulsion electrokinetic chromatography. Separation was achieved using an untreated fused-silica capillary (48 cm (effective length 40 cm) x 50 num) at 25 kV; detection was performed by UV at 220 nm. The microemulsion system consisted of 70 mM octane, 800 mM 1-butanol, 80 mM sodium dodecyl sulfate (SDS) and 10 mM borate buffer, pH 9. Very high efficiencies (up to 400 000 plates) and resolution better than 3 were achieved. Since this technique is not compatible with mass spectrometry (MS) detection, a capillary electrochromatographic (CEC) method was developed to separate flunitrazepam and its metabolites. The effects of mobile phase composition and pH as well as voltage and temperature were systematically investigated. The optimized CEC method allowed the baseline separation of the investigated compounds. For the on-line coupling of CEC with electrospray ionization-mass spectrometry, the column was connected to a void fused-silica capillary using a Teflon connection. This configuration was found efficient and suitable for hyphenation of commercial CEC and MS instrumentation using commercially available CEC columns.

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Section: Introductioncontrasting

confidence: 67%

“…However, this technique resulted in CEC column disequilibration and led to a large increase in retention times. Moreover, in an attempt to improve the detection limit, a high-sensitivity zeta cell was also investigated [9,10]. However, as in CE, this sensitivity gain was often achieved at the expense of separation efficiency.…”

Section: Introductionmentioning

confidence: 83%

Microemulsion electrokinetic chromatography versus capillary electrochromatography-UV-mass spectrometry for the analysis of flunitrazepam and its major metabolites

et al. 2002

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“…On the other hand, Cooper et al [67] concluded that for the analysis of azoxystrobin (a fungicide) and pirimicarb (an insecticide) it was impossible to achieve LODs by UV detection required for pesticide residue analysis. A decrease of at least two orders of magnitude was considered required.…”

Section: Pesticidesmentioning

confidence: 99%

Recent applications of capillary electrochromatography

et al. 2001

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A review is presented of the most important recent applications of capillary electrochromatography (CEC) for the analysis of acidic, basic, and neutral compounds, of biomolecules, environmental substances, natural products, pharmaceuticals, and chiral compounds. Packed-column CEC (packed-CEC), open-tubular (OT-CEC), as well as pressure-assisted CEC (pseudo-CEC) are hereby considered. Papers published between July 1999 and April 2001 were taken into account. Applications before July 1999 have been reviewed in Electrophoresis 1999, 20, 3027-3065.

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“…A nonaqueous method with surfactant modifiers was introduced in 1997 by Carabias-Martínez et al [6] for the separation of the following six triazine herbicides: simazine (26), atrazine (27), ametryne (28), propazine (29), prometryne (30), and terbutryne (31). This method was employed for use in two articles [7,8] where the main focus was on sample preconcentration prior to separation, which will be discussed later.…”

Section: Czementioning

confidence: 99%

“…Cooper et al [26] used the idea of a water-rich sample plug to increase sensitivity for an insecticide, primacarb, and a fungicide, azoxystrobin, before separation by CEC. They were able to improve the S/N by fivefold to about 10:1.…”

Section: On-line Trace Enrichmentmentioning

confidence: 99%

Capillary electrophoresis and electrochromatography of pesticides and metabolites

Tegeler

Rassi

2001

Electrophoresis

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Synthetic pesticides are important chemicals since they are widely used to control many types of weeds, insects, and other pests in a wide variety of agricultural and nonagricultural settings. This review article is aimed at describing the recent progress made in capillary electrophoresis (CE) and capillary electrochromatography (CEC) of pesticides and metabolites. The various electrophoretic systems and detection schemes that were introduced during the period extending from the second half of 1999 to the first half of 2001 for the CE and CEC of pesticides are discussed. Also included in this review article are the various approaches for trace enrichment that are involved in the analysis of dilute pesticide samples.

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Capillary electrochromatography for pesticide analysis: Effects of environmental matrices

Cited by 17 publications

References 16 publications

Microemulsion electrokinetic chromatography versus capillary electrochromatography-UV-mass spectrometry for the analysis of flunitrazepam and its major metabolites

Microemulsion electrokinetic chromatography versus capillary electrochromatography-UV-mass spectrometry for the analysis of flunitrazepam and its major metabolites

Recent applications of capillary electrochromatography

Capillary electrophoresis and electrochromatography of pesticides and metabolites

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