A conductimetric study of the association between cyclodextrins and surfactants—application to the electrochemical study of a mixed aqueous system: Substrate, cyclodextrin, surfactant

The association of anionic surfactants with β -cyclodextrin. An isothermal titration calorimeter study

“…Table 1 lists the thermodynamic data of anionic surfactants with β-CD and the published values. (6)(7)(8)(9)(10)(11) For these types of inclusion complexes, the results agree well with a 1:1 association model, consistent with the literature. (6)(7)(8)(9)(10)(11) (The stoichiometric ratio for the C 12 H 25 SO 4 Na/β-CD complex can also be obtained from the endpoint of figure 3.…”

“…However, these values have not been determined at the same surfactant concentration, and this factor notably influences the association constant value. (11) The most likely mode of complexation of ligands to cyclodextrins consists of insertion of the hydrophobic portion of the ligand into the cyclodextrin cavity with the polar group of the ligand remaining solvent exposed at the wide top end of the cavity. (1)(2)(3)(4) In general, the complexation is non-covalent.…”

“…a Values are the averages of three determinations; b n.m.r. spectroscopy; (10) c conductimetry (11) ; d conductance measurements; (7) e fluorimetric measurements (using fluorescent probes as a competitive inhibitor for association); (8) f conductance measurements; (6) g conductivity and P Na measurements. contributions.…”

Rapid enantiomeric separation of polychlorinated biphenyls by electrokinetic chromatography using mixtures of neutral and charged cyclodextrin derivatives

“…On the other hand, these results do not agree with those obtained by CD-MEKC [13,14], in which g-CD was more effective in the enantiomeric separation of chiral PCBs than b-CD due to the larger size of the cavity of g-CD compared to b-CD. This different behavior between CD-MEKC and CD-EKC could be due to the formation of a ternary complex PCBsurfactant monomer-CD (demonstrated for other several solutes and surfactants [25]), which does not take place in CD-EKC. In addition, some authors believe that this ternary complex inside the g-CD cavity may account for its effectiveness [26].…”

How does β-cyclodextrin affect oxygen solubility in aqueous solutions of sodium perfluoroheptanoate?

“…Pure CF 3 surfactant monomers in solution [39][40][41]. Spectroscopic methods show that the interaction between CDs and surfactants is stronger than that between surfactant monomers [42][43][44][45][46].…”