Formation of fluorophores from nitrogenous pesticides by photolysis and reaction with OPA-2-mercaptoethanol for fluorescence detection in liquid chromatography

Patel, Bhagwandas M.; Moye, H. A.; Weinberger, Robert

doi:10.1021/jf00091a027

Cited by 11 publications

(8 citation statements)

References 20 publications

(28 reference statements)

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“…Generally, PIF methods are considered as efficient fluorophore-generating systems for stationary media [132][133][134][135][136][137][138][139][140][141] as well as for flowing devices such as HPLC post-column photoreaction [142,[145][146][147][148][149] or FIA [21,[142][143][144]. Among the various parameters controlling the analyte conversion photoreaction and method sensitivity, two are particularly important, namely the optimum UV irradiation time (t irr opt , corresponding to the maximum PIF signal) [132,135,138] and the type of solvent [132,135,138,142,149].…”

Section: Pif Optimal Analytical Conditionsmentioning

confidence: 99%

“…Among the various parameters controlling the analyte conversion photoreaction and method sensitivity, two are particularly important, namely the optimum UV irradiation time (t irr opt , corresponding to the maximum PIF signal) [132,135,138] and the type of solvent [132,135,138,142,149]. The t irr opt and PIF intensity values vary significantly with the solvent polarity and its protic or aprotic character.…”

Section: Pif Optimal Analytical Conditionsmentioning

confidence: 99%

“…The applicability of the amine-generating photolysis reaction of pesticides OPA/2-ME derivatization was extended by Moye et al [142,[147][148][149]] to a broad range of classes of nitrogeneous pesticides including carbamates, carbamoyloximes, carbamothioic acids, dithiocarbamates, organophosphorus, sulfonylureas, thiadiazolureas, thioureas, bipyridiniums, triazines, dinitrophenols, amides, acetamides and amines. PIF detection could be used with OPA/2-ME [142,[146][147][148][149][150] and without it [142,147,148].…”

Section: Pif-labelling Combined With Hplcmentioning

confidence: 99%

“…PIF detection could be used with OPA/2-ME [142,[146][147][148][149][150] and without it [142,147,148].…”

Section: Pif-labelling Combined With Hplcmentioning

confidence: 99%

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Luminescence methods in pesticide analysis. Applications to the environment

Aaron¹,

Coly²

2000

Analusis

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DossierLuminescence spectroscopy such as the need for pretreatment procedures in the case of weakly volatile and/or thermally labile pesticides (e.g., carbamates, phenylureas and sulfonylureas). The second most utilized method is HPLC, with UV-visible absorption detectors; it remains the technique of choice for screening work.The use of luminescence techniques (especially fluorescence) for organic pesticide residue analysis has been limited by the fact that, relatively few of these compounds are strongly luminescent. However, many compounds do possess the necessary degree of aromaticity and may be converted into luminescent species using a variety of methods. Hence, two distinct cases have to be considered. (i) If the pesticide under study is luminescent, then it can be determined directly; (ii) if the pesticide is non or weakly luminescent, it can be converted into a luminescent compound using various physicochemical means, including chemical and/or photochemical reactions.Derivatization reactions constitute an important aspect of pesticide luminescence analysis since many pesticides have one or more functional groups and can be converted into more stable derivatives to successfully ensure environmental analysis. The number of papers, especially reviews [8][9][10][11][12][13] and books [14][15][16][17], in which this subject is discussed, demonstrates this increase of the derivatization use.In this review, the most important publications concerning significant advances in the luminescence methodology, instrumentation and applications to environmental analysis of pesticides will be reported. We will describe the recent available literature on direct and indirect fluorimetric methods, photochemically-induced fluorescence, photosensitized fluorescence and phosphorimetric methods used for pesticide analysis. As it will be shown, recent instrumentation, including sophisticated electronics and precise optical systems, makes luminescence a highly sensitive and selective tool for pesticide residue detection. Fluorimetric methodsAn early work on the fluorescence of pesticides has been performed in stationary solutions, (i.e., batch procedure) by

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Section: Pif Optimal Analytical Conditionsmentioning

confidence: 99%

Section: Pif Optimal Analytical Conditionsmentioning

confidence: 99%

Section: Pif-labelling Combined With Hplcmentioning

confidence: 99%

“…PIF detection could be used with OPA/2-ME [142,[146][147][148][149][150] and without it [142,147,148].…”

Section: Pif-labelling Combined With Hplcmentioning

confidence: 99%

See 2 more Smart Citations

Luminescence methods in pesticide analysis. Applications to the environment

Aaron¹,

Coly²

2000

Analusis

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“…22 These methods are sensitive and accurate; however, many of these involve expensive methods, and toxic solvents, are slow and require the development of extremely complex gradients for the separation. Table 1 reports a comparison of various methods for determination of triazines in terms of sample matrix, limit of detection and sampling rate.…”

Section: Introductionmentioning

confidence: 99%

Photodegradation and Flow-Injection Determination of Simetryn Herbicide by Luminol Chemiluminescence Detection

2008

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A novel and simple flow injection chemiluminescence method is reported for the determination of simetryn, a common herbicide. The method is based on the direct oxidation of luminol by the photoproducts of the simetryn in alkaline medium in the absence of catalyst/oxidant. The linear concentration range was 0.01 -2 mg mL -1 simetryn with a correlation coefficient (r 2 ) of 0.9997 and relative standard deviations (RSD; n = 4) in the range of 0.9 -2.3%. The limit of detection (S/N = 3) was 7.5 ng mL -1 with a sample throughput of 100 h -1 . The proposed method has been applied to determine simetryn in natural waters using Sep-Pak C18 cartridges for solid phase extraction (SPE) procedure. The recoveries were in the range of 97 ± 1 to 104 ± 2%. The mechanism of chemiluminescence reaction has also been discussed briefly.

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Environmental analysis based on luminescence in organized supramolecular systems

2006

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The use of organized supramolecular systems-including micellar media and cyclodextrin inclusion complexes-combined with luminescence techniques in the study and determination of compounds and elements of environmental interest from 1990 to 2005 is reviewed. Analyses of environmental samples performed using fluorescence, photochemically induced fluorescence and phosphorescence spectroscopy as well as liquid chromatography, capillary electrophoresis and flow injection with luminescence detection in the presence of these organized media are described in detail.

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Formation of fluorophores from nitrogenous pesticides by photolysis and reaction with OPA-2-mercaptoethanol for fluorescence detection in liquid chromatography

Cited by 11 publications

References 20 publications

Luminescence methods in pesticide analysis. Applications to the environment

Luminescence methods in pesticide analysis. Applications to the environment

Photodegradation and Flow-Injection Determination of Simetryn Herbicide by Luminol Chemiluminescence Detection

Environmental analysis based on luminescence in organized supramolecular systems

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