A non-ionic surfactant as a new solvent for liquid—liquid extraction of zinc(II) with 1-(2-pyridylazo)-2-naphthol

Watanabe, Hiroto; Tanaka, Hiroaki

doi:10.1016/0039-9140(78)80151-9

Cited by 389 publications

(171 citation statements)

References 9 publications

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“…15,16 A surfactant media is necessary to dissolve chelating reagents such as 1-(2-thiazolylazo)-2-naphtol (TAN), 17 dithizone 18 and 1-(2-pyridylazo)2-naphtol (PAN). 1 Cloud point extraction has been extensively described as a separation and pre-concentration procedure for metals prior to their determination by atomic spectrometric techniques. 19 Specific applications of CPE with Triton ® X-114 to determine traces of Bi-dithizonate in urine and human hair by electrothermal atomic absorption spectrometry (ET AAS) have been reported.…”

Section: Introductionmentioning

confidence: 99%

“…Surfactant mediated phase separation constitutes the basis for the approach known as cloud point extraction 1 which is a liquid-liquid extraction alternative to that of organic solvents. The main parameter to attain a surfactant monomer agglomeration in a micelle-rich phase is the surfactant concentration at the cloud point temperature.…”

Section: Introductionmentioning

confidence: 99%

“…2 The effect of additives such as salts and other surfactants also has to be considered. 1,3 The first application of cloud point extraction for analytical purposes described the micelle aggregation of hydrophobic anionic metal complexes. 2 The ability of surfactant micelles to bind organic compounds separated by CPE was applied for pre-concentration of organic compounds prior to the separation of species by capillary electrophoresis 3 and chromatography.…”

Section: Introductionmentioning

confidence: 99%

“…Another advantage of surfactants attaining the critical micelle concentration (CMC) at low temperature is the minimum redissolution of micelles into the bulk aqueous solution occurring during phase separation. 1 Theoretical aspects and applications of phase separations using aqueous solutions of surfactants have been described. 5,6 Dialkyl phosphorodithiotic acids and the sodium salt diethyldithiophosphate were ligands proposed for solvent extraction of several metals.…”

Section: Introductionmentioning

confidence: 99%

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Sequential cloud point extraction of trace elements from biological samples and determination by inductively coupled plasma mass spectrometry

Giné¹,

Patreze²,

Silva³

et al. 2008

J. Braz. Chem. Soc.

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A extração no ponto nuvem (CPE) foi realizada em duas etapas seqüenciais para a determinação de elementos traço em soro humano, sangue animal e dieta alimentar por espectrometria de massas com fonte de plasma indutivamente acoplado. A primeira CPE foi realizada adicionando dietil-ditiofosfato, Triton ® X-114 seguida de aquecimento a 40 °C, centrifugação e esfriamento a 0 °C. A fase rica em surfactante foi separada para determinar Cd, Pb e Cu pela técnica de quantificação por diluição isotópica. As medidas das razões isotópicas foram caracterizadas por RSD < 0.7%. O pH da solução empobrecida em surfactantante foi ajustado entre 4 e 5 antes da adição de 4-(2-pirilidazo)resorcinol, Triton ® X-114 e seguiram-se os procedimentos para atingir o ponto nuvem. Na segunda fase rica em surfactante extraída foram quantificados Co e Ni pelo método de adições de padrão com RSD < 2%. Recuperações entre 85 a 96% foram obtidas para todos os elementos. A exatidão foi aferida pela análise de materiais de referência com valores recomendados e certificados.A two-step sequential cloud point extraction (CPE) of trace elements from small sample volumes of human serum, animal blood, and food diet is proposed to gain analytical information in the analysis by inductively coupled plasma mass spectrometry. The first CPE was attained by adding O,O-diethyldithiophosphate, the non ionic surfactant Triton ® X-114 followed by heating at 40 °C, centrifugation and cooling at 0 °C. The resulting surfactant-rich phase was separated to determine Cd, Pb and Cu by isotope dilution. Isotope ratio measurements presented RSD < 0.7%. The residual surfactant-poor phase solution had the pH adjusted in the range 4 to 5 before the chelating reagent, 4-(2-pyridylazo) resorcinol plus surfactant Triton ® X-114 were added followed by the sequence to attain the CPE. Co and Ni were quantified in the second extracted surfactantrich phases by standard additions method with RSD < 2%. Recoveries from 85 to 96% were obtained for all elements. Analyzing reference materials with certified and recommended values assessed accuracy.Keywords: sequential cloud point extraction, CPE, inductively coupled plasma mass spectrometry, isotope dilution, biological samples, trace elements IntroductionSurfactant mediated phase separation constitutes the basis for the approach known as cloud point extraction 1 which is a liquid-liquid extraction alternative to that of organic solvents. The main parameter to attain a surfactant monomer agglomeration in a micelle-rich phase is the surfactant concentration at the cloud point temperature. The temperature-concentration phase diagram is specific for each surfactant. 2 The effect of additives such as salts and other surfactants also has to be considered. 1,3 The first application of cloud point extraction for analytical purposes described the micelle aggregation of hydrophobic anionic metal complexes. 2 The ability of surfactant micelles to bind organic compounds separated by CPE was applied for pre-concentration of organic Sequential Cloud Poin...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Sequential cloud point extraction of trace elements from biological samples and determination by inductively coupled plasma mass spectrometry

Giné¹,

Patreze²,

Silva³

et al. 2008

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

show abstract

“…The cloud point phase separation behavior of certain surfactants above their critical micelle concentrations (CMC) in aqueous solutions, i.e., the ability of these amphiphiles in forming two apparently immiscible phases -a surfactant-rich (coacervate) phase and a surfactant-dilute, bulk aqueous phase -upon certain conditions (e.g., an increase of the temperature of the micellar solutions above the threshold temperature), was first demonstrated by Watanabe and Tanaka to possess good potential for the rapid and efficient preconcentration of metal ions [1], and cloud point extraction (CPE)-based methodologies are finding increasing usages in the extraction/purification of proteins and other biomolecules [2,3], as well as in the chromatographic analysis of a wide range of organic analytes [4].…”

Section: Introductionmentioning

confidence: 99%

Enhancement in sample preconcentration by the on-line incorporation of cloud point extraction to flow injection analysis inside the chemiluminescence cell and the determination of total serum bilirubin

Song

Lin

et al. 2007

Analytica Chimica Acta

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Polymer-induced phase separation in aqueous micellar solutions of octyl-β-D-thioglucoside for extraction of membrane proteins

Tani

Saitoh

Kamidate

et al. 1997

Biotechnol. Bioeng.

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A water‐soluble polymer such as polyethylene glycol (PEG), Dextran T‐500 (Dx), or diethylaminoethyl‐Dextran (DEAE‐Dx) induced aqueous micellar solutions of octyl‐β‐D‐thioglucoside (OTG) to phase separation at 0°C. One of the two phases thus formed is a surfactant‐depleted aqueous solution (aqueous phase) of a water‐soluble polymer and the other a concentrated OTG solution (surfactant‐rich phase). In a combination of OTG with PEG or Dx, cytochrome P450 (P450) and cytochrome b5 (b5) were well extracted into the surfactant‐rich phase. The extraction yield of P450 was slightly greater than that of b5. In contrast to PEG and Dx, DEAE‐Dx markedly reduced the extraction of b5, while that of P450 remained almost unchanged. DEAE‐Dx served the dual functions of inducing the phase separation and preventing the extraction of b5 into the surfactant‐rich phase. This depressed extraction of b5 was reversed by the addition of potassium phosphate. DEAE‐Dx and potassium phosphate proved effective in controlling the extractability of b5. The polymer‐induced phase separation provides a new basis for highly efficient extraction of membrane proteins under mild conditions that should be acceptable for thermolabile membrane proteins under physiological conditions. © 1997 John Wiley & Sons, Inc. Biotechnol Bioeng 56: 311–318, 1997.

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A non-ionic surfactant as a new solvent for liquid—liquid extraction of zinc(II) with 1-(2-pyridylazo)-2-naphthol

Cited by 389 publications

References 9 publications

Sequential cloud point extraction of trace elements from biological samples and determination by inductively coupled plasma mass spectrometry

Sequential cloud point extraction of trace elements from biological samples and determination by inductively coupled plasma mass spectrometry

Enhancement in sample preconcentration by the on-line incorporation of cloud point extraction to flow injection analysis inside the chemiluminescence cell and the determination of total serum bilirubin

Polymer-induced phase separation in aqueous micellar solutions of octyl-β-D-thioglucoside for extraction of membrane proteins

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