System peaks in micellar electrophoresis: I. Utilization of system peaks for determination of critical micelle concentration

Lokajová, Jana; Hruška, Vlastimil; Tesařová, Eva; Gaš, Bohuslav

doi:10.1002/elps.200700780

Cited by 12 publications

(15 citation statements)

References 21 publications

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“…The CMC values were determined from the fraction of complexed dye and they are listed in Table . The CMC values are higher than in buffered solution as already shown in literature , however, we were able to observe the same trends in micelle formation and we were able to determine CMC up to 30% ACN. It has to be pointed out that the CMC value in ACN‐free solution is slightly lower than generally accepted value 8.4 mM, which is most probably caused by electrostatic interaction of the positively charged rhodamine with SDS molecules.…”

Section: Resultssupporting

confidence: 88%

“…Lokajová et al. showed that the mobility of system peaks can change by prompt “jump,” when the CMC is reached and micelles are formed. This allows determining the CMC with very high precision.…”

Section: Resultsmentioning

confidence: 99%

“…In 2008 Gas and co‐workers presented a novel electrophoretic technique for the determination of the CMC by CE. Here, the mobility of system peaks is observed and the CMC can be detected as discontinuity.…”

Section: Introductionmentioning

confidence: 99%

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Comprehensive study on critical micellar concentrations of SDS in acetonitrile–water solvents

et al. 2016

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The CMC is one of the fundamental characteristics of surfactants and its determination is crucial for detail understanding of micelles formation. In this study the CMC of SDS in presence of ACN was determined by two independent experimental techniques, capillary electrophoresis and fluorescence correlation spectroscopy (FCS). Yet, studies of SDS micellization in solutions containing ACN as organic modifier are sparse and inconsistent in literature. The measurements were performed for various ACN contents in the range of 0-50% v/v. At ACN contents of up to 10% v/v the CMC is lower when compared to the aqueous solution, while increasing ACN content causes a significant increase of the CMC. Formation of micelles was observed up to ACN concentrations of 35% v/v, which is in contrast to most of the reports in literature. Based on the results of the FCS experiments, we were able to confirm that presence of ACN causes a gradual increase of the size of the micelles with increasing concentration of SDS. Simultaneously, we proved that the classical conductivity approach for the determination of the CMC does not yield reliable results in the presence of higher content of an organic modifier such as ACN.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

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Comprehensive study on critical micellar concentrations of SDS in acetonitrile–water solvents

et al. 2016

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“…Several other methods have been developed for CMC determinations. Non-invasive physical methods include capillary electrophoresis [81][82][83], speed of sound measurements [84,85], resonance Rayleigh scattering [86], static and dynamic light scattering [74,87,88], potentiometry [89], nuclear magnetic resonance, NMR [90,91], diffusion ordered spectroscopy NMR [92,93], ultrasonic spectroscopy [94], fiber-optical measurements [95], induction current [96], chemiluminescence [97] and chiroptical spectroscopic methods [98].…”

Section: Scientific Challenges 51 Surfactantsmentioning

confidence: 99%

Determining the water solubility of difficult-to-test substances: A tutorial review

Birch

Redman²,

Letinski

et al. 2019

Analytica Chimica Acta

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“…This software was chosen due to its easiness and because it has been extensively validated with numerous experimental works [8,19,20].…”

Section: Instrumentmentioning

confidence: 99%

Robustness of the co‐ion transfer ratio in capillary electrophoresis

Erny¹,

Esteves

2009

J of Separation Science

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In CE, indirect detection mode often exhibits a lower precision than its direct counterpart. Although various explanations have already been advanced, in this work, we aimed to investigate if this is due, in part, to problems of robustness of the co-ion transfer ratio (TR), thus being inherent to this particular detection scheme. This was investigated using simulation software that allows an accurate control of various parameters and validated using acetic acid as a test compound. It was conclusively demonstrated that the TR could vary by more than 6% when the concentration of one of the ions in the BGE was changed by as few as 1%. The presence of a system peak seems to be particularly damaging as it has been shown that the TR of peaks whose mobilities differ by more than 0.5x10(-8) m(2) V(-1) s(-1) from one of the system peaks, still have a relatively low robustness.

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System peaks in micellar electrophoresis: I. Utilization of system peaks for determination of critical micelle concentration

Cited by 12 publications

References 21 publications

Comprehensive study on critical micellar concentrations of SDS in acetonitrile–water solvents

Comprehensive study on critical micellar concentrations of SDS in acetonitrile–water solvents

Determining the water solubility of difficult-to-test substances: A tutorial review

Robustness of the co‐ion transfer ratio in capillary electrophoresis

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