Room temperature imidazolium ionic liquid: A solvent for extraction of carbamates prior to liquid chromatographic analysis

Vichapong, Jitlada; Burakham, Rodjana; Srijaranai, Supalax; Grudpan, Kate

doi:10.1016/j.talanta.2011.01.002

Cited by 46 publications

(33 citation statements)

References 27 publications

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“…Several analytical techniques have been developed for the analysis of carbamates in various samples, such as spectrophotometry [4,5], voltammetry [6], gas chromatography (GC) [7], high-performance liquid chromatography (HPLC) [8][9][10], and capillary electrophoresis (CE) [11,12]. HPLC with a variety of detection systems, i.e., ultraviolet [8,[13][14][15], fluorescence [16,17], chemiluminescence [18], and mass spectrometry [19], is the preferred choice for analysis of carbamate pesticides.…”

Section: Introductionmentioning

confidence: 99%

“…Acetonitrile-water or, most often, methanol-water mixtures at different pH have been used as mobile phases. Our research group has proposed the reversed-phase HPLC systems, using a Waters Symmetry C18 and a Waters Atlantis C18 columns, for separation of some carbamate pesticides in food and environmental matrices [8][9][10]. One focus of HPLC development over the recent years has been on fast separation.…”

Section: Introductionmentioning

confidence: 99%

“…Although HPLC is a sensitive and selective analytical technique, carbamates usually exhibit at very low concentrations and in complex matrices [9]. Therefore, sample preparation is still required to isolate the analytes from the complex matrices, remove interfering compounds, and achieve a sufficient sensitivity.…”

Section: Introductionmentioning

confidence: 99%

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Development and validation of an ultrasound-assisted surfactant-enhanced emulsification microextraction method for liquid chromatographic determination of carbamate residues in fruit juices

Vichapong¹,

Burakham²

2015

Acta Chromatographica

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Summary.A microextraction procedure based on ultrasound-assisted surfactantenhanced emulsification microextraction (UASEME) was optimized and validated for preconcentration of carbamate pesticides prior to fast determination using high-performance liquid chromatography (HPLC) with monolithic column. The nonionic surfactant (Tween 20) was used as an emulsifier, and chloroform was selected as an extraction solvent. The experimental parameters affecting the extraction efficiency, such as the kind, concentration, and volume of surfactant, the kind of extraction solvent and its volume, salt addition, ultrasonic extraction time, and centrifugation time, were optimized. Under the selected UASEME and HPLC conditions, separation of five carbamate pesticides (carbofuran, carbaryl, isoprocarb, methiocarb, and promecarb) was achieved within 10 min. The linearity of the method was obtained in the wide range of 2-5000 μg L −1 , with correlation coefficients of 0.9931-0.9970. The limits of detection were in the range of 0.4-7.0 μg L −1 . The relative standard deviations (n = 5) were less than 0.59% and 4.86% for retention time and peak area, respectively. The enrichment factors of the developed UASEME method were in the range of 33-166. The fruit juice samples (at fortified levels of 0.25, 0.50, and 1.00 mg L −1 ) were successfully analyzed, and the relative recoveries were obtained in the range of 81-115%.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Development and validation of an ultrasound-assisted surfactant-enhanced emulsification microextraction method for liquid chromatographic determination of carbamate residues in fruit juices

Vichapong¹,

Burakham²

2015

Acta Chromatographica

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“…Generally, analytical methods utilized for determination of carbamates in these matrices involve laborious steps, consume analysis time and require derivatization procedures, 40 which are not suitable in emergency cases related to intentional intoxications. 17 They usually include a liquid-liquid extraction (LLE), 18,28 solid-phase extraction (SPE), 19,22,[41][42][43] solid-phase microextraction (SPME), 44,45 matrix solid-phase dispersion (MSPD), [46][47][48] liquid-liquid microextraction, 49 dispersive liquid-liquid microextraction (DLLME), 50,51 temperature controlled ionic liquid dispersive liquid phase microextraction, 52 carbon nanotube reinforced hollow fiber liquid-phase microextraction 53 or supercritical fluid extraction 54 followed by gas 20,50,[55][56][57][58][59][60] or liquid chromatography. 1,19,48,49,52,53,[61][62][63][64][65][66][67][68][69][70] The low volatility and the thermolability of these compounds and ...…”

Section: Introductionmentioning

confidence: 99%

“…17,[30][31][32] The identification of these compounds in different matrices as well as their quantification are of interest in the criminal field since the number of human 3,17,[33][34][35][36] 53 or supercritical fluid extraction 54 followed by gas 20,50,[55][56][57][58][59][60] or liquid chromatography. 1,19,48,49,52,53,[61][62][63][64][65][66][67][68][69][70] The low volatility and the thermolability of these compounds and the high polarities of the transformation products obviously favor the use of column liquid chromatography (LC) as the separation technique.Due to the low detection levels required by regulatory agencies, efficient sample preparation and trace-level detection are important aspects in an analytical method. The extraction and cleanup steps are sometimes carried out simultaneously using techniques such as solid-phase extraction (SPE) and solvent extraction with low temperature partitioning (SE-LTP).…”

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Determination of carbamates in beverages by liquid-liquid extraction with low temperature partitioning and liquid chromatography

Goulart¹,

Alves²,

Paula³

et al. 2012

J. Braz. Chem. Soc.

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Carbamatos são os pesticidas mais frequentemente encontrados em alimentos e bebidas de coloração escura em casos de intoxicação acidental ou intencional. Neste trabalho, extração líquido-líquido com partição em baixa temperatura (LLE-LTP) foi otimizada e validada para determinação dos carbamatos aldicarb, carbofuran e carbaril em bebidas de sucos de uva e leite achocolatado. Este método envolve a extração com acetonitrila, partição líquido-líquido em baixa temperatura e análise por cromatografia líquida de alta eficiência com detecção ultravioleta (HPLC-UV). O método é rápido, eficiente e de baixo custo, emprega pequenos volumes de solvente por amostra e não necessita de limpeza dos extratos. O método de extração foi seletivo e apresentou porcentagens de extração acima de 90%. As premissas relacionadas com os testes estatísticos de linearidade foram verificadas e confirmadas. O método de extração e análise foi validado com resultados satisfatórios e pode ser aplicado em análises de rotina e forenses.Carbamates are the pesticides most commonly found in dark colored foods and beverages in cases of accidental or intentional poisoning. In this work, the liquid-liquid extraction with low temperature partitioning (LLE-LTP) was optimized and validated for determination of the carbamates aldicarb, carbofuran and carbaryl in grape juice and chocolate milk beverages. This method involved extraction with acetonitrile, liquid-liquid partition at low temperature and the analysis by high performance liquid chromatography with ultraviolet detection (HPLC-UV). The method is rapid, efficient and of low-cost, employing small volumes of solvent per sample and requiring no cleanup of the extracts. The extraction methodology was selective and presented recovery percentages above 90%. The premises related to the statistical linearity tests were checked and confirmed. The method of extraction and analysis was validated with satisfactory results, and may be applied in forensic and routine analysis Keywords: carbamates, low temperature partitioning, high performance liquid chromatography, sample preparation, validation IntroductionCarbamate insecticides are widely used in gardening and agriculture due to their broad spectrum of activity and relatively short environmental persistence. However, they are potentially toxic to humans, particularly in the context of intentional self-poisoning. 1,2 Carbamates are found as commercialized products for agricultural practices and some compounds of this group, with their respective commercial names are: carbaryl (Sevin ® ), aldicarb (Temik ® ) and carbofuran (Furadan ® ). From these, aldicarb stands out as the main target on the list of controlled pesticides of the United States Environmental Protection Agency (EPA) due to its elevated toxicity to mammals. 3,4 The maximum residue level (MRL) of aldicarb 5,6 and carbofuran 6 in water is 10 and 7 μg L -1 , respectively. In Goulart et al. 1155 Vol. 23, No. 6, 2012 milk, the MRLs established for aldicarb, 7,8 Exposures may occur accidentally, with ...

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Methodological aspects of sample preparation for the determination of carbamate residues: A review

Santaladchaiyakit

Srijaranai

Burakham

2012

J of Separation Science

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This review covers recent developments in sample preparations and analytical techniques for determination of residues of carbamate pesticides. Special attention is paid to the newly established microextraction techniques, including cloud-point extraction, dispersive liquid-liquid microextraction, and ultrasound-assisted surfactant-enhanced emulsification microextraction. In addition, extractions using a variety of solvents, as well as miniaturized and on-line sample preparation systems, are discussed. Applications of the different methods for the determination of carbamate pesticide residues in food and environmental matrices are included.

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Room temperature imidazolium ionic liquid: A solvent for extraction of carbamates prior to liquid chromatographic analysis

Cited by 46 publications

References 27 publications

Development and validation of an ultrasound-assisted surfactant-enhanced emulsification microextraction method for liquid chromatographic determination of carbamate residues in fruit juices

Development and validation of an ultrasound-assisted surfactant-enhanced emulsification microextraction method for liquid chromatographic determination of carbamate residues in fruit juices

Determination of carbamates in beverages by liquid-liquid extraction with low temperature partitioning and liquid chromatography

Methodological aspects of sample preparation for the determination of carbamate residues: A review

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