Influence of the addition of modifiers on solute-micelle interaction in hybrid micellar liquid chromatography

López-Grío, S.; Baeza-Baeza, J.J.; García-Álvarez-Coque, M.C.

doi:10.1007/bf02467595

Cited by 69 publications

(38 citation statements)

References 11 publications

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“…At 50 % ACN, three individual peaks were observed in the extended migration time of more than 10 min. Therefore, 40 % ACN was selected for the following work, offering high separation efficiency and resolution within a short time, although the critical micelle concentration of SDS is above 30 mM for a volume fraction of ACN of 40 % [31]. However, if there was no SDS, all three analytes migrated with the EOF, and they could not be separated.…”

Section: Optimization Of Mekc Conditionsmentioning

confidence: 99%

Dual cloud point extraction coupled with hydrodynamic-electrokinetic two-step injection followed by micellar electrokinetic chromatography for simultaneous determination of trace phenolic estrogens in water samples

Wen

Liu

et al. 2013

Anal Bioanal Chem

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A dual cloud point extraction (dCPE) off-line enrichment procedure coupled with a hydrodynamic-electrokinetic two-step injection online enrichment technique was successfully developed for simultaneous preconcentration of trace phenolic estrogens (hexestrol, dienestrol, and diethylstilbestrol) in water samples followed by micellar electrokinetic chromatography (MEKC) analysis. Several parameters affecting the extraction and online injection conditions were optimized. Under optimal dCPE-two-step injection-MEKC conditions, detection limits of 7.9-8.9 ng/mL and good linearity in the range from 0.05 to 5 μg/mL with correlation coefficients R 2 ≥0.9990 were achieved. Satisfactory recoveries ranging from 83 to 108 % were obtained with lake and tap water spiked at 0.1 and 0.5 μg/mL, respectively, with relative standard deviations (n=6) of 1.3-3.1 %. This method was demonstrated to be convenient, rapid, cost-effective, and environmentally benign, and could be used as an alternative to existing methods for analyzing trace residues of phenolic estrogens in water samples.

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Section: Optimization Of Mekc Conditionsmentioning

confidence: 99%

Dual cloud point extraction coupled with hydrodynamic-electrokinetic two-step injection followed by micellar electrokinetic chromatography for simultaneous determination of trace phenolic estrogens in water samples

Wen

Liu

et al. 2013

Anal Bioanal Chem

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“…Small additions of ethanol decrease the CMC of SDS [29] but it increases at more than 20 % (v/v) portion of ethanol in micellar solutions [29,30]. Probably, CMC decrease in presence of ethanol small amounts is caused by diminution of solution dielectric constant that weakens mutual repulsion of surfactant ionic heads and promotes micellization [31].…”

Section: Electrochemical Oxidation Of Retinol In Surfactant Mediamentioning

confidence: 99%

Cyclic Voltammetry of Retinol in Surfactant Media and Its Application for the Analysis of Real Samples

2010

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Retinol is irreversibly oxidized at 790 mV in water 0.1 M LiClO 4 that corresponds to formation of retinal. Effect of surfactant on voltammetric characteristics of retinol oxidation has been evaluated. The calibration graph was linear in the range 29.4-980 mM of retinol with detection limit of 15 mM in presence of 1.1 10 À4 M of sodium dodecyl sulfate. Application of surfactant media leads to decrease of detection limit, enlargement of analytical range for retinol determination and permits analyze retinol in water media. Simple, express and reliable voltammetric approach for determination of retinol in real samples using surfactant media have been developed.

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“…Timeresolved photophysical techniques, including micellar fluorescence quenching and fluorescence anisotropy, were combined with photostationary measurements to determine the changes in size, relative viscosity, and polarity of the SDS micelles upon addition of those hydrophilic alcohols. The results of this investigation are relevant to several applied topics in colloids where micelles and microemulsions in alcohol-water mixtures have been used as host structures for vinyl polymerization processes (21) and an elution medium in micellar liquid chromatography (22,23). Also, 2-propanol is a reagent used in studies of photohydrogen abstraction by ketones in both homogeneous and micellar solutions (24).…”

Section: Introductionmentioning

confidence: 99%

The Change in the Properties of Sodium Dodecyl Sulfate Micelles upon Addition of Isomeric and Unsaturated Short-Chain Alcohols Probed by Photophysical Methods

Romani

Gehlen

Lima

et al. 2001

Journal of Colloid and Interface Science

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Influence of the addition of modifiers on solute-micelle interaction in hybrid micellar liquid chromatography

Cited by 69 publications

References 11 publications

Dual cloud point extraction coupled with hydrodynamic-electrokinetic two-step injection followed by micellar electrokinetic chromatography for simultaneous determination of trace phenolic estrogens in water samples

Dual cloud point extraction coupled with hydrodynamic-electrokinetic two-step injection followed by micellar electrokinetic chromatography for simultaneous determination of trace phenolic estrogens in water samples

Cyclic Voltammetry of Retinol in Surfactant Media and Its Application for the Analysis of Real Samples

The Change in the Properties of Sodium Dodecyl Sulfate Micelles upon Addition of Isomeric and Unsaturated Short-Chain Alcohols Probed by Photophysical Methods

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