Thin-layer chromatographic detection of dichlorvos and dimethoate using orcinol

Mali, B. D.; Garad, M. V.; Patil, V. B.; Padalikar, S.V.

doi:10.1016/0021-9673(95)00091-z

Cited by 12 publications

(6 citation statements)

References 3 publications

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“…After reduction with SnCl 2 , these insecticides were diazotized and coupled with 1-naphthylamines (132). After heating at 100°C for 10 min the detection limit under UV light at 365 nm was 1 /xg and 15 )ug for dichlorvos and dimethoate, respectively (135). A new spray reagent for selective detection of dichlorvos in biological materials was described.…”

Section: A Visualization By Color Reactionsmentioning

confidence: 99%

“…Several detection reagents for carbaryl were referred to: formation of the oxime, treatment with j8-naphthol, and oxidation with nitric acid (145); diazotized /?-nitroaniline Copyright © 2003 by Taylor & Francis Group LLC and diazotized p-aminoacetophenonone (146); /7-nitrobenzenediazonium fluoborate (147); alkaline phenylhydrazine hydrochloride, with a detection limit of about 100 ng/spot (148); specific reagent ammonium cerium(IV) nitrate in 20% HC1, which reacts with 1-naphthol hydrolysis product of carbaryl and forms a violet complex (149); diazotized 6-amino-l-naphthol-3-sulfonic acid and then NaOH solution (150). Several detection reagents for carbaryl were referred to: formation of the oxime, treatment with j8-naphthol, and oxidation with nitric acid (145); diazotized /?-nitroaniline Copyright © 2003 by Taylor & Francis Group LLC and diazotized p-aminoacetophenonone (146); /7-nitrobenzenediazonium fluoborate (147); alkaline phenylhydrazine hydrochloride, with a detection limit of about 100 ng/spot (148); specific reagent ammonium cerium(IV) nitrate in 20% HC1, which reacts with 1-naphthol hydrolysis product of carbaryl and forms a violet complex (149); diazotized 6-amino-l-naphthol-3-sulfonic acid and then NaOH solution (150).…”

Section: A Visualization By Color Reactionsmentioning

confidence: 99%

“…In contributions mentioned earlier, OP insecticides were determined in water (45) and in complex samples (84) using 2-D TLC and PRISMA optimization. Various detection methods reviewed in Section IV were applied for chemical (130)(131)(132)(133)(134)(135)(136)139), physical (177), and enzymatic (207,208) detection of OP insecticides. Various detection methods reviewed in Section IV were applied for chemical (130)(131)(132)(133)(134)(135)(136)139), physical (177), and enzymatic (207,208) detection of OP insecticides.…”

Section: Organophophorous Insecticidesmentioning

confidence: 99%

“…Some methods of carbaryl, carbofuran, and propoxur detection were reviewed in Section IV (145)(146)(147)(148)(149)156 thionate and phosphorothiolothionate pesticide detection was also mentioned (151). Some methods of carbaryl, carbofuran, and propoxur detection were reviewed in Section IV (145)(146)(147)(148)(149)156 thionate and phosphorothiolothionate pesticide detection was also mentioned (151).…”

Section: E Carbamates and Urea Derivativesmentioning

confidence: 99%

See 3 more Smart Citations

Pesticides

Babi_¹,

Ka_telan-Macan²

2003

Handbook of Thin-Layer Chromatography

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Section: A Visualization By Color Reactionsmentioning

confidence: 99%

Section: A Visualization By Color Reactionsmentioning

confidence: 99%

Section: Organophophorous Insecticidesmentioning

confidence: 99%

Section: E Carbamates and Urea Derivativesmentioning

confidence: 99%

See 2 more Smart Citations

Pesticides

Babi_¹,

Ka_telan-Macan²

2003

Handbook of Thin-Layer Chromatography

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“…Além desse processo, existem outros processos químicos e biológicos que são responsáveis pela detecção de resíduos de pesticidas em TLC e a maior ou menor sensibilidade e seletividade desses compostos vão depender da capacidade que os mesmos possuem de inibir determinadas reações químicas ou biológicas 10 . A literatura apresenta vários exemplos desses métodos capazes de detectar pesticidas na ordem de nanogramas [11][12][13][14][15][16][17][18][19][20][21] . Compostos organoclorados, fenoxiácidos e triazinas podem ser detectados com nitrato de prata 16 .…”

Section: Introductionunclassified

Análise de resíduos de pesticidas em tomates por cromatografia em camada delgada

Moraes¹,

Rezende²,

Nakagawa³

et al. 2002

Quím. Nova

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Recebido em 31/10/00; aceito em 6/9/01 ANALYSIS OF RESIDUE PESTICIDE IN TOMATOES BY THIN LAYER CHROMATOGRAPHY. Pesticide residues are determined by thin layer chromatography (TLC) using the Hill reaction as a detection method. Tomatoes samples without pesticide were fortified with atrazine, diuron, chloroxuron and metribuzin, and were applyed in silica gel plates with the help of a microsyringe. The pesticides were elued with ethyl acetate. There was no need of cleaning up because no interference was noticed. After the revelation of the plates, the diameters of the spots were measure by using a rule. The range of the determined concentration for all the pesticides was from 0.1 to1.0 ng/mL. The results obtained through TLC can be used for semi-quantitative analysis.The results obtained were compared to gas and liquid chromatography, showing good agreement between both techniques.Keywords: tomatoes; Hill reaction; thin layer chromatography. INTRODUÇÃODevido aos riscos que os resíduos de pesticidas trazem à saúde de quem consome alimentos contaminados com eles, há necessidade de um monitoramento constante dos níveis de resíduos dos mesmos nos mais variados produtos 1 . Instituições com laboratórios capazes de analisar resíduos de pesticidas são escassas em muitas regiões e totalmente ausentes em outras. Isto porque os métodos analíticos usualmente empregados nestas análises, que são os cromatográficos, requerem equipamentos sofisticados e pessoal técnico especializado. Além disso, essas técni-cas demandam dos laboratórios de resíduos grande investimento em infra-estrutura e materiais nem sempre acessíveis 2 . Assim, devido ao alto custo das análises, necessidade de pessoal especializado e sofisticação dos métodos empregados, a elevação do número de amostras a serem analisadas não pode ser feita na justa medida da demanda. Conseqüentemente, a busca de novos métodos para monitorar resíduos de pesticidas deve ser estimulada tanto sob o ponto de vista ambiental como o de saúde pública 3,4 . Desta forma, neste trabalho pretendeu-se desenvolver uma metodologia simples e de baixo custo, sem a necessidade de equipamentos sofisticados e de fácil aplicação local, isto é, nas próprias regiões produtoras e distribuidoras de frutas e legumes por exemplo, podendo-se, assim, ampliar o monitoramento e controlar a qualidade desses produtos nas principais regiões agrícolas do Brasil.A cromatografia em camada delgada (TLC) foi a metodologia escolhida e desenvolvida neste estudo para a determinação dos resí-duos. As vantagens desse método são a simplicidade, a instrumentação de baixo custo e a versatilidade, apresentando-se, portanto, adequado à execução de determinações em série. Além disso, a TLC pode ser usada quando as possibilidades de aplicação de outros métodos são limitadas pelas propriedades da amostra, como por exemplo, substâncias termolábeis, baixa volatilidade ou presença de quantidades consideráveis de impurezas dificultando a análise (resinas, pigmentos, etc.) [5][6][7] . O sucesso da separação cromatográfica depende do...

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Chromatography TLC

Forg��cs¹,

Cserh��ti²

2002

Encyclopedia of Agrochemicals

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High‐performance liquid chromatography (HPLC) has been developed as a rapid and sensitive method for the separation and quantitative determination of a wide variety of compounds present in complex matrices in very low concentration. As gas–solid and gas–liquid chromatographic techniques are only suitable for the analysis of volatile and thermostable compounds with relatively low molecular mass, HPLC methods can also separate nonvolatile, thermolabile, and large molecules. The excellent separating power, high sensitivity, and considerable diversity of solutes that could be separated with HPLC contributed to its popularity.

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Thin-layer chromatographic detection of dichlorvos and dimethoate using orcinol

Cited by 12 publications

References 3 publications

Pesticides

Pesticides

Análise de resíduos de pesticidas em tomates por cromatografia em camada delgada

Chromatography TLC

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