Fluorimetric derivatization for pesticide residue analysis

Lawrence, James F.; Frei, R.W.

doi:10.1016/s0021-9673(00)84786-x

Cited by 46 publications

(14 citation statements)

References 116 publications

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“…The type of chemical derivatization reaction applied to the analyte depends essentially on the pesticide family under study [8,10,12,[62][63][64][65]. In all cases, the method consists to generate a fluorophore by means of a chemical reagent or a thermal treatment.…”

Section: Pretreatment Fluorimetric Methodsmentioning

confidence: 99%

“…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.…”

Section: Dossiermentioning

confidence: 99%

“…Because of its high sensitivity, fluorogenic labelling represent the most widely used pretreatment method for pesticide analysis [8,12]. In this method, a fluorophore molecule is chemically bonded to a non-fluorescent analyte; only a hydrogen atom or another atom of the analyte is replaced by the fluorophore moiety.…”

Section: Fluorogenic Labellingmentioning

confidence: 99%

“…Originally, Lawrence and Frei [78,79] determined pesticides using fluorogenic labelling with dansyl chloride (dans-Cl). Presently, it exists a number of labelling reagents, including dans-Cl, NBD chloride (NBD-Cl), fluorescamine and orthophthalaldehyde with 2-mercaptoethanol (OPA/2-ME) or with 3-mercaptopropionic acid (OPA/3-MP) [8][9][10]80]. They react easily with compounds such as alkylamines, arylamines, thiols and phenols, which are widely found among the pesticide degradation reaction products.…”

Section: Fluorogenic Labellingmentioning

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: Pretreatment Fluorimetric Methodsmentioning

confidence: 99%

“…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.…”

Section: Dossiermentioning

confidence: 99%

Section: Fluorogenic Labellingmentioning

confidence: 99%

Section: Fluorogenic Labellingmentioning

confidence: 99%

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Luminescence methods in pesticide analysis. Applications to the environment

Aaron¹,

Coly²

2000

Analusis

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“…Although there is a number of methods employed to assay pesticides using different detectors as fluorimetric, [11][12][13][14][15][16][17] photometric [18][19][20] and electrochemical, [21][22][23] some problems still arise associated with the complexity of the matrices, particularly in the case of HS solutions where the ionic strength is so high that the common methods frequently fail. To overcome this difficulty, large dilution factors are often used but with prejudice to the sensitivity of the methods.…”

Section: Introductionmentioning

confidence: 99%

Determination of triazines in hemodialysis saline solutions by adsorptive stripping voltammetry after extraction in acetonitrile

Nascimento¹,

Bohrer²,

Carvalho³

et al. 2003

J. Braz. Chem. Soc.

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A determinação de herbicidas 2-metiltio-4,6-dialquilamino-1,3,5-triazina (triazinas) em soluções salinas utilizadas em hemodiálise foi investigada por voltametria. Os herbicidas foram detectados com grande sensibilidade nas soluções salinas, após extração em fase de acetonitrila (ACN), utilizando o eletrodo de mercúrio de gota pendente. O efeito de salting out originado pelo meio salino existente nas soluções viabilizou as extrações. A relação de volumes entre as fases salina e de ACN foi investigada para alcançar a melhor sensibilidade na detecção das triazinas. A especiação entre as triazinas investigadas (ametrina, desmetrina, prometrina e terbutrina) não foi possível e recuperações entre 88 e 107% foram calculadas em amostras fortificadas com os analitos. Utilizando esta metodologia, limites de detecção de 0,03 µmol L -1 foram calculados para as triazinas nas amostras salinas.A method for the voltammetric determination of 2-methylthio-4,6-dialkylamino-1,3,5-triazine (triazines) herbicides in hemodialysis (HD) saline solutions was developed. The herbicides were detected in the saline solutions at the hanging mercury drop electrode (HMDE) with high sensitivities only after extraction of the analytes in acetonitrile (ACN). The salting out effect originated by the saline environment existing in the solutions enabled the extractions. The volume ratio between the saline and ACN phases was investigated in order to find the best sensitivity to detect the triazines. The speciation amongst them (ametryn, desmetryn, prometryn and terbutryn) was not possible. Recoveries between 88 and 107% were calculated in spiked samples, and detection limits of 0.03 µmol L -1 were calculated for the triazines in the saline samples using this methodology. Keywords: herbicides, triazines, hemodialysis, voltammetry IntroductionThe growing interest in the use of pesticides in agricultural production and their negative environmental impact has led to a number of studies for the development of different analytical methods. Besides the frequently used chromatographic measurements, voltammetry, mainly with differential pulse modes 1-9 should be taken into consideration as a fast, easy and inexpensive alternative. Additionally, the sensitivity of the electrochemical methods, their applicability over an unusually wide concentration range, is highly satisfactory for meeting requirements of toxicological, ecotoxicological and environmental regulation enforcement. 10 Hemodialysis (HD) solutions are prepared by mixing pure water and a high-salt (HS) content solution (about 7.0 mol L -1 ) to compose the final HD solution that has a salt concentration of about 0.2 mol L -1 . It is used to maintain the blood ionic equilibrium of the patients during the hemodialysis sessions. The presence of contaminants in the water or in HS solutions must be detected before a hemodialysis session as the HD solution remains very close to the blood of the patients separated only by the dialysis membranes. To aggravate the problem, the dialysis membranes can dialysate ...

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Zur Rückstandsbildung der Herbizide und ihrer lebensmittelhygienisch‐toxikologischen Bedeutung. 1. Mitt. Allgemeines, Wirkungsmechanismen, Toxikologie und Metabolismus

Wirthgen

Raffke

1977

Nahrung

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Die Ernteverluste durch Unkräuter betrugen Ende der 60er Jahre im Weltmaßstab gesehen ca. 10% [43]. Für das Gebiet der. DDR berechnete sich der Schaden im selben Zeitraum auf 700 Mio. Mark/Jahr [43, 77]. Die Unkräuter stehen unter allen Schaderregern an 2. Stelle. Deshalb wurde der Pflanzenschutzmittelverbrauch in den letzten 20 Jahren stark (um das 3,7fache) erhöht, wobei die Unkrautbekämpfung 20% aller landwirtschaftlichen Arbeiten einnimmt [43]. Die chemische Unkrautbekämpfung mit Herbiziden ist neben der vorbeugenden und mechanischen Unkrautbekämpfung die Methode mit dem höchsten ökonomischen Nutzen.

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Fluorimetric derivatization for pesticide residue analysis

Cited by 46 publications

References 116 publications

Luminescence methods in pesticide analysis. Applications to the environment

Luminescence methods in pesticide analysis. Applications to the environment

Determination of triazines in hemodialysis saline solutions by adsorptive stripping voltammetry after extraction in acetonitrile

Zur Rückstandsbildung der Herbizide und ihrer lebensmittelhygienisch‐toxikologischen Bedeutung. 1. Mitt. Allgemeines, Wirkungsmechanismen, Toxikologie und Metabolismus

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