Influence of premicelles and micellar aggregates of ionic and nonionic surfactants in the oxidative decarboxylation of l-lysine by gold(III) complexes

Maiti, Krishnendu; Sen, Pratik; Pal, Biswajit

doi:10.1016/j.molliq.2017.12.034

Cited by 15 publications

(25 citation statements)

References 57 publications

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“…The CMC values of surfactants not only relate to their molecular structures but also are sensitive to environments and relate to suppliers [6,7]. Therefore, their CMC values need to be measured in their practical applications and research [8][9][10][11][12][13]. Among current methods for CMC determination, the fluorescence method based on the fluorescent change of organic probes attracts great attention owing to its high sensitivity and fast response [6,8,[14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Influence factors on the critical micelle concentration determination using pyrene as a probe and a simple method of preparing samples

Liang

et al. 2020

R. Soc. open sci.

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Zhu Q. 2020 Influence factors on the critical micelle concentration determination using pyrene as a probe and a simple method of preparing samples. R. Soc. open sci. 7: 192092. http://dx.The critical micelle concentration (CMC) is an important parameter of widely used surfactants and needs to be measured in the application and development of surfactants. Fluorometric method is a widely used method determining CMC values owing to the advantages of highly sensitivity, fast response and wide application range. There are two common methods (I and II) of preparing samples for CMC fluorometric determination. In the process of developing CMC probes with aggregation-induced emission (AIE) characteristics, we found that methods I and II were not suitable for CMC probes with AIE charateristics and developed a new sample preparation method (III), which is not only suitable for CMC probes with AIE characteristic but also decreases operation procedures and errors owing to omitting the addition of micro amount of dyes into each sample. To ascertain if method III is also suitable for other CMC probes without AIE characteristics, the CMC values of surfactants were determined by fluorometric method using widely used pyrene without AIE charateristic as probe and methods I-III to prepare samples. The obtained experimental results proved that method III not only was suitable for preparation of samples for CMC determination of surfactants using pyrene as probe but also led to the least average deviation (methods I-III led to ±0.13, ±0.34 and ±0.05 mM deviation for the CMC determination of sodium dodecyl sulfate (SDS), respectively). The CMC determination using pyrene as probe is based on its change in the ratio (I FIII /I FI ) of its emission peaks I and III with surfactant concentration. Unexpectedly, it was found that the I FIII /I FI value of pyrene in surfactant solutions is sensitive to the measurement conditions changing exciting light energy, such as slit widths and sample-measured number. In addition, it was found that surfactant SDS or cetrimonium bromide from different suppliers not only has significantly different CMC values but also leads to very different I FIII /I FI values of pyrene in a certain concentration of surfactant, which can be used as a simple method to distinguish the same surfactant with different CMC values.

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Section: Introductionmentioning

confidence: 99%

Influence factors on the critical micelle concentration determination using pyrene as a probe and a simple method of preparing samples

Liang

et al. 2020

R. Soc. open sci.

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“…1 The phenomenon of pre-micelle formation for normal and gemini surfactants below CMC concentration was studied recently by NMR diffusometry and relaxometry. 23,24 The aggregate morphologies of gemini surfactants are more diverse than those observed for their monomeric counterparts. The determination of the morphology at the transition region (above CMC) can be useful for specic applications where narrow size distribution of micelles is desired such as the transmembrane peptide structure elucidation.…”

Section: Introductionmentioning

confidence: 99%

Clear distinction between CAC and CMC revealed by high-resolution NMR diffusometry for a series of bis-imidazolium gemini surfactants in aqueous solutions

et al. 2018

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“…In the presence of surfactants, hydrophobic and electrostatic interactions occur between the reactants and the surfactant monomers/aggregates, which may either favor or restrict the movement of the attacking reagent and thus the rate of the reaction is either enhanced or retarded . For all the three surfactants, there is an initial decrease of the reaction rate with an increase in [surfactant].…”

Section: Resultsmentioning

confidence: 99%

“…In case of TX‐100 and Tween 20, there may be interaction between the –OH groups of fructose and the polar oxyethylene groups and the –OH groups of the surfactant monomers through H‐bonding. Such interactions may lead to the formation of small aggregates, called premicelles, which may either sterically or entropically inhibit the approach of the oxidant, thus decreasing the reaction rate. It is evident from Figure that there is either a hump or a maximum near the CMC when both the reactants become associated with the micelle and come in the vicinity of each other, and beyond this point k ψ decreases slowly with further increase of [surfactant], possibly due to lowering of concentrations of both the reactants within the micelle (known as dilution effect).…”

Section: Resultsmentioning

confidence: 99%

Effect of microheterogeneous environments of CTAB, Triton X‐100, and Tween 20 on the oxidative degradation of d‐fructose by nanoparticles of MnO₂

Midya

Ghosh

Pal³

et al. 2018

Int J of Chemical Kinetics

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The kinetics of the oxidative degradation of D-fructose by nanoparticles of MnO 2 has been studied in dilute sulfuric acid medium and also in the presence of surfactants of cetyl trimethyl ammonium bromide (CTAB), Triton X-100 (TX-100), and Tween 20. Amorphous nanoparticles of MnO 2 in the form of spherical particulates of size 50-200 nm, as detected by a transmission electron microscope, have been found to exist, supported on two-dimensional gum acacia sheets. The reaction is first order in MnO 2 but complex order with respect to fructose and H + . The reaction is inhibited due to adsorption of reaction products on the surface of MnO 2 nanoparticles. The reaction takes place through an intermediate complex formation between -D-fructopyranose and protonated MnO 2 . A one-step two-electron transfer reaction ultimately leads to the formation of an aldonic acid and formic acid. The entropy of activation plays the key role for the reaction in the absence of surfactants. In the surfactant-mediated reaction, partitioning of both the reactants takes place between the aqueous and micellar pseudophases and reaction occurs following Berezin's model. Binding of fructose with the surfactants in the Stern/palisade layer takes place through the ion-dipole interaction and H-bonding while protonated MnO 2 remains at the outer side of the Stern/palisade layer within the micelle. Both the enthalpy and entropy changes associated with the fructose-water interaction, fructose-micelle interaction, and micelle-water interaction finally control the fructose-micelle binding.

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Influence of premicelles and micellar aggregates of ionic and nonionic surfactants in the oxidative decarboxylation of l-lysine by gold(III) complexes

Cited by 15 publications

References 57 publications

Influence factors on the critical micelle concentration determination using pyrene as a probe and a simple method of preparing samples

Influence factors on the critical micelle concentration determination using pyrene as a probe and a simple method of preparing samples

Clear distinction between CAC and CMC revealed by high-resolution NMR diffusometry for a series of bis-imidazolium gemini surfactants in aqueous solutions

Effect of microheterogeneous environments of CTAB, Triton X‐100, and Tween 20 on the oxidative degradation of d‐fructose by nanoparticles of MnO₂

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Influence of premicelles and micellar aggregates of ionic and nonionic surfactants in the oxidative decarboxylation of l-lysine by gold(III) complexes

Cited by 15 publications

References 57 publications

Influence factors on the critical micelle concentration determination using pyrene as a probe and a simple method of preparing samples

Influence factors on the critical micelle concentration determination using pyrene as a probe and a simple method of preparing samples

Clear distinction between CAC and CMC revealed by high-resolution NMR diffusometry for a series of bis-imidazolium gemini surfactants in aqueous solutions

Effect of microheterogeneous environments of CTAB, Triton X‐100, and Tween 20 on the oxidative degradation of d‐fructose by nanoparticles of MnO2

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Effect of microheterogeneous environments of CTAB, Triton X‐100, and Tween 20 on the oxidative degradation of d‐fructose by nanoparticles of MnO₂