Micellar catalysis in reaction-rate methods

Pérez‐Bendito, Dolores; Rubio, Soledad

doi:10.1016/0165-9936(93)85008-7

Cited by 39 publications

(12 citation statements)

References 26 publications

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“…Also they change the effective microenvironment around dissolved solutes and hence their physiochemical properties such as absorptivity, equilibrium constant, spectral profile, etc. These features can help to overcome many of the analytical problems encountered in multicomponent determinations (Sicilia et al 1994;Perez-Bendito and Rubio 1993).…”

Section: Resultsmentioning

confidence: 98%

Surfactant-mediated complex formation for determination of traces amounts of zinc, cadmium, and lead with 4-(2-thiazolylazo) resorcinol and chemometric methods

Ghasemi

Hashemi

2011

Environ Monit Assess

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The partial least squares modeling is a powerful multivariate statistical tool applied to the spectrophotometric simultaneous determination of the divalent ions of zinc, cadmium, and lead based on the formation of their complexes with 4-(2-thiazolylazo) resorcinol in surfactant media. The linear concentration range for zinc, cadmium, and lead were 0.10-1.31, 0.148-1.92, and 0.148-3.70 mg L( -1), respectively. The experimental calibration set was composed of 36 sample solutions using a mixture design for three component mixtures. The absorption spectra were recorded from 380 through 650 nm. The effect of pH on the sensitivity in determination of zinc, cadmium, and lead was studied in order to choose the optimum pH (pH = 8) for determination. The root-mean-square errors of predictions for zinc, cadmium, and lead were 0.0466, 0.0282, and 0.050, respectively. The proposed method was successfully applied for the determination of zinc, cadmium, and lead in water samples.

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Section: Resultsmentioning

confidence: 98%

Surfactant-mediated complex formation for determination of traces amounts of zinc, cadmium, and lead with 4-(2-thiazolylazo) resorcinol and chemometric methods

Ghasemi

Hashemi

2011

Environ Monit Assess

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“…CDs and their derivatives are among the most popular chiral mobile-phase additives in LC because they can separate a wide variety of enantiomers, are soluble and stable over a very wide pH range (2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12), have low UV absorbance, and several of them (native, methylated, and hydroxypropylated derivatives) are relatively cheap compared with other selectors. (21) They are also used in CSPs chemically bonded to silica via 6-10 atom long spacers, adsorbed onto silica as a CD polymer or grafted onto a linear polymer as a pendant group.…”

Section: Chiral Supramolecular-assisted Liquid Chromatographymentioning

confidence: 99%

“…On the basis of these effects, many surfactant-modified procedures and new methodological approaches have been developed in spectral analysis, electroanalytical chemistry, and kinetic analysis. (8,9) In the last few years, the effects of solutes on some parameters of supramolecular assemblies (i.e. critical micellar concentration (CMC) and binding degree) have been also exploited for analytical measurements.…”

Section: Introductionmentioning

confidence: 99%

Supramolecular Analytical Chemistry in Separation Techniques

Ballesteros‐Gómez

Sicilia

Rubio

2010

Encyclopedia of Analytical Chemistry

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Supramolecular analytical chemistry is an emergent science covering the study and application of supramolecular systems (host molecules and molecular aggregates) in analytical processes. This article covers the progress on both theoretical and practical aspects related to the use of supramolecular systems in separation techniques reported over the last decade. Principles of supramolecular chemistry that allow a better understanding of the mechanisms of formation of the supramolecular entities and solubilization of solutes are outlined. Developments related to the use of supramolecular solvents and hemimicellar or admicellar sorbents in analytical extractions are critically discussed. Advances in the use of micelles in liquid chromatography (LC) and electrophoresis as well as developments in chiral chromatography and electrophoresis based on the use of cyclodextrins (CDs) and their derivatives are presented. Emphasis is placed on the strategies developed to make these techniques compatible with mass spectrometry (MS). The capability of supramolecular systems to effectively solubilize solutes in a wide polarity range is highlighted.

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“…Micelles posses a high potential for multicomponent analysis, which can be used as special reaction media because they alter the rate, equilibrium position 24 , products and stereochemistry of many reactions. In the metal-dye complex, at a concentration above critical micelle concentration micelles form a ternary complex with advantageous properties, such as hyper chromic and bath chromic shifts that can modify the sensitivity of the method by affecting the interferences and matrix effects 25 .…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Determination of Eosin‐Yellow and Ponceau‐S Using H‐Point Standard Addition Method in Micellar Media

Kaur

Gupta

2011

Journal of Chemistry

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H-point standard addition method (HPSAM) is developed for simultaneous determination of eosin-Yand ponceau-s in micellar media. Nickel chloride (NiCl2) is used as chromogenic reagent for complexes formation of eosin-Yand ponceau-Sfood colorants. The measurements were carried out using sodium lauryl sulphate as a surfactant, in buffered solution at pH 6.0. The concentration range of 0.115-2.53 μg/mL of eosin-Yand 0.159-3.80 μg/mL of ponceau-S. The proposed procedures have been applied successfully for the simultaneous determination of eosin-Yand ponceau-Sin synthetic binary mixtures and real samples.

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Micellar catalysis in reaction-rate methods

Cited by 39 publications

References 26 publications

Surfactant-mediated complex formation for determination of traces amounts of zinc, cadmium, and lead with 4-(2-thiazolylazo) resorcinol and chemometric methods

Surfactant-mediated complex formation for determination of traces amounts of zinc, cadmium, and lead with 4-(2-thiazolylazo) resorcinol and chemometric methods

Supramolecular Analytical Chemistry in Separation Techniques

Simultaneous Determination of Eosin‐Yellow and Ponceau‐S Using H‐Point Standard Addition Method in Micellar Media

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