Potentiometric study on critical micellization concentrations (CMC) of sodium salts of bile acids and their amino acid derivatives

Nakashima, Toshio; Anno, Tomoyuki; Kanda, Hiroshi; Sato, Yuka; Kuroi, Tatsuaki; Fujii, H.; Nagadome, Shigemi; Sugihara, Gohsuke

doi:10.1016/s0927-7765(01)00222-3

Cited by 36 publications

(20 citation statements)

References 15 publications

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“…The amount of H 2 produced was around 0.2 μmol after 15 min, 1.9 μmol after 3 h and became almost constant (4.3 μmol) after approximately 11 h (Figure 1). Bile acids are known to be surfactants, with a low critical micelle concentration in aqueous solutions 28,35. As discussed above for ada‐viol‐ada, the monoradical cation of the viologen ada‐viol‐DC is stabilized compared to Me‐viol‐Me owing to its enhanced aggregation.…”

Section: Resultsmentioning

confidence: 99%

Variation of the Viologen Electron Relay in Cyclodextrin‐Based Self‐Assembled Systems for Photoinduced Hydrogen Evolution from Water

et al. 2012

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The light‐driven reduction of protons for the production of molecular hydrogen in multicomponent systems depends on electron relays such as viologens. We describe here the effect of viologens appended with guest moieties (adamantane or bile acid) on the efficiency of a system composed of a cyclodextrin‐appended photosensitizer [Ir(ppy)2(pytl‐βCD)]Cl [ppy = 2‐phenylpyridine; pytl = 2‐(1‐substituted‐1H‐1,2,3‐triazol‐4‐yl)pyridine; CD = cyclodextrin], cyclodextrin‐modified Pt nanoparticles as the catalyst, and ethylenediaminetetraacetic acid (EDTA) as the sacrificial donor. The system was designed to self‐assemble in a supramolecular manner in order to promote electron transfer and produce hydrogen. Cyclic voltammetry (CV) measurements in DMF showed that the electron‐donating adamantyl substituent decreases the reduction potential of the viologen. The use of symmetric and asymmetric guest‐appended viologens gave rise to unexpected phenomena in the H2 evolution. The presence of adamantane or bile acid groups on the viologen induced stabilization and aggregation of the radical cations in water, which is disadvantageous for hydrogen formation.

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Section: Resultsmentioning

confidence: 99%

Variation of the Viologen Electron Relay in Cyclodextrin‐Based Self‐Assembled Systems for Photoinduced Hydrogen Evolution from Water

et al. 2012

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“…For the optimization of the formulations and processes in all of these areas, the knowledge of CMC or aggregation concentration data is therefore of prime importance. A number of analytical techniques have been commonly implemented to obtain these data, among which conductimetry [6], potentiometry [7], surface tension measurement [8], absorbance and fluorescence spectroscopy [9], light scattering [10], cyclic voltammetry [11] and NMR [12]. The choice of a technique may depend on its availability, easiness of use, but also on the surfactant nature (ionic and non-ionic) and its spectroscopic properties.…”

Section: Introductionmentioning

confidence: 99%

Determination of aggregation thresholds of UV absorbing anionic surfactants by frontal analysis continuous capillary electrophoresis

Saux

Varenne

Gareil

2004

Journal of Chromatography A

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“…It has been shown that the CMC values determined by the same technique in different laboratories are very dispersed, especially for the trihydroxy bile salts [2,[6][7][8][9]. Furthermore, it has been demonstrated that the CMC measurements made in one laboratory using different techniques are also not in good agreement [2,[10][11][12].…”

Section: Introductionmentioning

confidence: 99%

The CMC-like behaviour of bile salts as probed by photoexcited Rose Bengal

Seret

Bahri

2009

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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The onset of the aggregation process in aqueous bile salt (BS) solutions remains a debated question. This study aimed at investigating this point through the detection of BS monomers and small aggregates using the dye Rose Bengal. Results showed that a few small BS aggregates led to a red shift of the absorption spectrum, while the BS monomer reacted with the photo-induced semi-oxidized dye and decreased its decay rate constant. The dye was dissolved in aqueous solution (10 mmol dm -3 NaOH) of sodium cholate (NaC), deoxycholate (NaDC), chenodoxycholate (NaCDC), dehydrocholate (NaDHC), glycocholate (NaGC) glycodeoxycholate (NaGDC), taurocholate (NaTC), taurodeoxycholate (NaTDC) and the zwitterionic analogue of sodium cholate called CHAPS. BS aggregates were detected at concentrations well below the concentration above which any added bile salt molecules

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Potentiometric study on critical micellization concentrations (CMC) of sodium salts of bile acids and their amino acid derivatives

Cited by 36 publications

References 15 publications

Variation of the Viologen Electron Relay in Cyclodextrin‐Based Self‐Assembled Systems for Photoinduced Hydrogen Evolution from Water

Variation of the Viologen Electron Relay in Cyclodextrin‐Based Self‐Assembled Systems for Photoinduced Hydrogen Evolution from Water

Determination of aggregation thresholds of UV absorbing anionic surfactants by frontal analysis continuous capillary electrophoresis

The CMC-like behaviour of bile salts as probed by photoexcited Rose Bengal

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