Analysis of cationic surfactants by capillary electrophoresis

Piera, E.; Erra, P.; Infante, M. R.

doi:10.1016/s0021-9673(96)00663-2

Cited by 55 publications

(34 citation statements)

References 17 publications

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“…The low solubility of long-chain cations in water is an additional drawback. By adding high contents of organic solvents to buffer and sample, micelle formation is inhibited, the relatively hydrophobic surfactants are solubilized, and, in some cases, EOF is reduced, for instance, when methanol is used [21][22][23]. For these reasons, nonaqueous CE (NACE) methods may prove useful for avoiding these drawbacks.…”

Section: Composition Of the Buffermentioning

confidence: 99%

Dual-opposite injection capillary electrophoresis for the determination of anionic and cationic homologous surfactants in a single run

Priego-Capote

Castro

2005

Electrophoresis

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An electrophoretic method for the simultaneous separation and determination of cationic and anionic surfactants based on double electrokinetic injection from the two ends of the capillary is proposed here. Nonaqueous capillary electrophoresis (NACE) with methanol as solvent was used to reduce the electroosmotic flow so that under these conditions the analytes migrate toward the corresponding electrode. The optimization step was the key to solve the problems associated with surfactants analysis (namely, adsorption on the capillary wall, micelle formation, and those issues related to the separation of homologous compounds). Good results were obtained with the proposed method both for the analysis of both spiked and natural samples, thus demonstrating the applicability of the proposed method for routine analysis. Finally, a comparison between the proposed method and two methods for independent analysis of cationic and anionic surfactants was made. The results showed that the precision (between 1.90 and 4.10% for repeatability and 7.43 and 8.98% for within-laboratory reproducibility, both expressed as relative standard deviation) and sensitivity (limits of detection and quantification between 0.52 and 1.88 microg/mL and between 1.73 and 6.20 microg/mL, respectively) are not affected by the CE mode. The resolution was similar to or better than that of the comparison methods and the analysis time was considerably shortened as both types of compounds were determined in a single run in only 9 min.

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Section: Composition Of the Buffermentioning

confidence: 99%

Dual-opposite injection capillary electrophoresis for the determination of anionic and cationic homologous surfactants in a single run

Priego-Capote

Castro

2005

Electrophoresis

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“…Therefore, it has important significance to develop new ways to detect cationic surfactant for controlling the pollution of environment and enhancing the protection of water resource. There are several methods to detect cationic surfactant now, such as spectrophotometry, [7][8][9] electrochemical sensor method, [10,11] flow injection analysis, [12] capillary electrophoresis method, [13,14] high performance liquid chromatography, [15,16] gas chromatography, [17] resonance scattering spectral assay, [18,19] diphasic titration [20] and so on. The electrochemical sensor, capillary electrophoresis and gas chromatography needed to use organic solvent, with low sensitivity and long analytical time.…”

Section: Introductionmentioning

confidence: 99%

A New Nanocatalytic Spectrophotometric Assay for Cationic Surfactant Using Phosphomolybdic Acid‐Formic Acid‐Nanogold as Indicator Reaction

2011

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In the pH 7.4 Na 2 HPO 4 -NaH 2 PO 4 buffer solution, the cationic surfactant (CS) interacted with nanogold particles (NG) to form NG aggregations (NGA) that resulted in its color changing from wine red to blue-violet. NG has a strong catalysis on the formic acid-phosphomolybdic acid (PMo) colored reaction, but that of the NGA catalysis is weak. With the increase of CS concentration, the NGA increased and the NG decreased, the catalysis decreased and the absorption value at 700 nm decreased linearly. The concentrations of 6.25-250 nmol/L tetradecyl dimethyl benzyl ammonium chloride (TDBAC), 0.625-250 nmol/L cetyltrimethyl ammonium bromide (CTMAB) and 12.5 -500 nmol•L -1 dodecyldimethylbenzyl ammonium chloride (DDBAC) had good linear responses to the decreased absorption value (ΔA 700 nm ), with molar absorption coefficients of 2.2×10 6 , 2.1×10 6 and 9×10 5 L•mol -1 •cm -1 respectively. This method was simple, highly sensitive and low-cost.

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“…The usual methods for the determination of cationic surfactants are ion-association titration, 12 extraction spectrometry, 13 high performance liquid chromatography with reversed 14,15 and ion-pair normal phase, 16 and also capillary zone electrophoresis (CZE). [17][18][19][20][21][22][23][24] The application of capillary isotachophoresis for the separation of C8-C20 cationic surfactants has been already reported by Tribet et al 25,26 and Praus. 27 The aim of this work was to study the CSs adsorption on montmorillonite.…”

Section: Introductionmentioning

confidence: 99%

A physico-chemical study of the cationic surfactants adsorption on montmorillonite

Praus¹,

Turicová²

2007

J. Braz. Chem. Soc.

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O objetivo deste trabalho é o estudo da adsorção de brometo de cetiltilmetilamônio (CTA) e de cloreto de cetilpiridínio (CP) em argilas do tipo montorilonita (MMT) ricas em sódio. Um método isotacoforético (ITP) específico foi desenvolvido visando à determinação rápida e simultânea dos surfatantes catiônicos (CS) adsorvidos. A fim de reduzir os limites de detecção, o método isotacoforético foi conjugado com a técnica de eletroforese capilar. Para determinar o arranjo dos surfatantes catiônicos (CS) adsorvidos na superfície das argilas foi efetuada a avaliação do balanço molar entre os surfatantes e os cátions metálicos juntamente com as isotermas de adsorção. A maior adsorção do CP comparada a do CTA pode ser entendida não só pela ação das forças eletrostáticas, mas também por outras interações, tais como, interação hidrofóbica cauda-cauda e/ou interações entre anéis piridínicos formando bicamadas incompletas e/ou monocamadas condensadas, respectivamente.The adsorption of cetyltrimethylammonium (CTA) bromide and cetylpyridinium (CP) chloride on Na + -rich montmorillonite (MMT) was studied. An ad hoc isotachophoretic (ITP) method was developed for the simultaneous and rapid determination of the cationic surfactants (CSs) adsorbed. In order to decrease the detection limits, ITP was on-line coupled with capillary zone electrophoresis. Adsorption data were analysed by their fitting with adsorption isotherms. The adsorption of CP is well described by the Langmuir isotherm. It indicates the monolayer arrangement of CP on the MMT surface. In case of the CTA data, the best fitting LangmuirFreundlich model with the power constant r<1 was found. It can be explained by the CTA interactions because of its intercalation into the MMT interlayer space.

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Analysis of cationic surfactants by capillary electrophoresis

Cited by 55 publications

References 17 publications

Dual-opposite injection capillary electrophoresis for the determination of anionic and cationic homologous surfactants in a single run

Dual-opposite injection capillary electrophoresis for the determination of anionic and cationic homologous surfactants in a single run

A New Nanocatalytic Spectrophotometric Assay for Cationic Surfactant Using Phosphomolybdic Acid‐Formic Acid‐Nanogold as Indicator Reaction

A physico-chemical study of the cationic surfactants adsorption on montmorillonite

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