Dispersive liquid–liquid microextraction versus single-drop microextraction for the determination of several endocrine-disrupting phenols from seawaters

López-Darias, Jessica; Germán-Hernández, Mónica; Pino, Verónica; Afonso, Ana M.

doi:10.1016/j.talanta.2009.09.057

Cited by 133 publications

(45 citation statements)

References 42 publications

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“…Efforts have been made to minimize classical extraction methods resulting in improved extraction techniques, called microextraction, that could greatly reduce the organic solvent consumption [22]. For this purpose, different types of liquid-phase microextraction (LPME) techniques, such as single drop microextraction (SDME) [23], hollow fiber liquid-phase microextraction (HF-LPME) [24], temperature-controlled ionic liquid dispersive liquid-phase microextraction (TILDLME) [25], dispersive liquid-liquid microextraction (DLLME) [15,26], and solidification of floating organic drop microextraction (SFODME) [27], have been invented. DLLME is a minimized sample preparation procedure, in which a mixture of few microliters of the organic extraction solvent and a dispersive solvent with high miscibility in both extractant and aqueous phases is injected rapidly into the sample.…”

Section: Introductionmentioning

confidence: 99%

“…Then, tiny droplets form and disperse among the aqueous sample solution and are further joined and sedimented in bottom of a conical test tube by centrifugation. The resulted sedimented phase is analyzed [13][14][15]23]. Recently, an innovative configuration of DLLME based on ultrasound assisted emulsification-microextraction has been developed [28].…”

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%

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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“…Some sample preconcentration procedures were applied for the pretreatment of BPA-containing samples, such as, single-drop liquid-phase microextraction (SDME) [6], solid-phase extraction (SPE) [7][8][9], liquid-liquid extraction (LLE) [10], stir bar sorptive extraction (SBSE) [11], solid-phase microextraction (SPME) [12,13], liquid-phase microextraction (LPME) [14], and molecularly imprinted solid-phase extraction (MISPE) [15,16]. Recently, a new microextraction method, named dispersive liquid-liquid microextraction (DLLME), introduced by Assadi et al [17], has been used as a powerful preconcentration technique for extraction of verity compounds including BPA [18][19][20][21][22][23][24][25][26][27]. One of the main disadvantages associated with DLLME, however, is that it uses toxic extraction solvents.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of alcoholic-assisted dispersive liquid-liquid microextraction of bisphenol a in water samples using an experimental design

Fatemi

Hadjmohammadi

Shakeri

2014

Acta Chromatographica

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Summary. Alcoholic-assisted dispersive liquid-liquid microextraction method (AA-DLLME) is used for the extraction, purification, and determination of bisphenol A in water samples by HPLC-UV. 1-octanol and methanol were selected as extraction and dispersive solvents of AA-DLLME procedure. The effects of several parameters of the AA-DLLME procedure (such as volume of extraction and dispersive solvents, amount of salt in sample solution, and extraction time) were investigated by a full factorial design. Then, the levels of significant factors were optimized using a central composite facecentered. The optimum conditions were obtained at 158 μL of extraction solvent, 500 μL of dispersive solvent, 1 min extraction time, and addition of 22% (w/v) of NaCl to the sample solution. Under optimum condition, the extraction recovery and the enrichment factor were determined, which were 91% and 65%, respectively. At these conditions, the limit of detection and the linearity were 0.10 and 1-100 μg L −1 , respectively. The relative standard deviations for intra-and inter-day of extraction of bisphenol A (BPA) were 6.98% and 9.80%, respectively (for five measurements). Finally, the method was successfully applied for the determination of BPA in environmental water samples. In conclusion, it can be stated that the applied method is fast, simple, and environmentally friendly.

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“…O BPA foi encontrado em águas superficiais em concentrações entre 1,1 e 3,6 µL -1 [137], em águas de mar (3,5 µg L -1 ) [138] e em águas de torneiras (concentrações entre 6,0 e 30 μg L -1 ) [135]. Em alimentos enlatados, tais como frutas e legumes [139], peixes [140,141], mel [142], leite em pó e refrigerantes [143], BPA foi encontrado em concentrações abaixo de 0,002 mg kg -1 [143], portanto abaixo do limite de 0,6 mg kg -1 estabelecido pelas agências reguladoras europeias [141] e brasileira [130].…”

Section: Introductionunclassified

“…Os procedimentos para a determinação do BPA são geralmente baseados em HPLC [137,138,143,144] utilizando detecção por fluorescência ou espectrometria de massas. Esta técnica é adequada para a determinação de BPA na maioria das amostras, pois apresenta limites de detecção da ordem de ng L -1 .…”

Section: Introductionunclassified

Desenvolvimento de procedimentos analíticos explorando microextração líquido-líquido em fluxo para a determinação de espécies de interesse em águas e leite

Nascimento¹

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Dispersive liquid–liquid microextraction versus single-drop microextraction for the determination of several endocrine-disrupting phenols from seawaters

Cited by 133 publications

References 42 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

Evaluation of alcoholic-assisted dispersive liquid-liquid microextraction of bisphenol a in water samples using an experimental design

Desenvolvimento de procedimentos analíticos explorando microextração líquido-líquido em fluxo para a determinação de espécies de interesse em águas e leite

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