A surface tension method for determining binding constants for cyclodextrin inclusion complexes of ionic surfactants

Dharmawardana, Udeni R.; Christian, Sherril D.; Tucker, Edwin E.; Taylor, Richard W.; Scamehorn, John F.

doi:10.1021/la00033a003

Cited by 120 publications

(87 citation statements)

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“…NaBr) on the critical micelle concentration (cmc) of surfactants (e.g., TTAB and CTAB) in CD-surfactant-containing solutions [199]. There are several cases, where surface tension measurements have been used to assess the stoichiometry and stability constants of host-guest complexes [116,[200][201][202][203][204][205][206][207].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

The formation of host–guest complexes between surfactants and cyclodextrins

Valente

Söderman

2014

Advances in Colloid and Interface Science

180

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Cyclodextrins are able to act as host molecules in supramolecular chemistry with applications ranging from pharmaceutics to detergency. Among guest molecules surfactants play an important role with both fundamental and practical applications. The formation of cyclodextrin/surfactant host-guest compounds leads to an increase in the critical micelle concentration and in the solubility of surfactants. The possibility of changing the balance between several intermolecular forces, and thus allowing the study of, e.g., dehydration and steric hindrance effects upon association, makes surfactants ideal guest molecules for fundamental studies. Therefore, these systems allow for obtaining a deep insight into the host-guest association mechanism. In this paper, we review the influence on the thermodynamic properties of CD-surfactant association by highlighting the effect of different surfactant architectures (single tail, double-tailed, gemini and bolaform), with special emphasis on cationic surfactants. This is complemented with an assessment of the most common analytical techniques used to follow the association process. The applied methods for computation of the association stoichiometry and stability constants are also reviewed and discussed; this is an important point since there are significant discrepancies and scattered data for similar systems in the literature.In general, the surfactant-cyclodextrin association is treated without reference to the kinetics of the process. However, there are several examples where the kinetics of the process can be investigated, in particular those where volumes of the CD cavity and surfactant (either the tail or in special cases the head group) are similar in magnitude.This will also be critically reviewed.

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Section: Accepted Manuscriptmentioning

confidence: 99%

The formation of host–guest complexes between surfactants and cyclodextrins

Valente

Söderman

2014

Advances in Colloid and Interface Science

180

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“…This host-guest interaction can increase the solubility of the hydrophobic chain and change the amphiphilicity, which results in the disruption of the aggregates of the amphiphiles. [137][138][139][140] Figure 20, they synthesized a dendritic amphiphile with a focal pyrene group. This dendron amphiphile formed vesicles in aqueous solution.…”

Section: Host-guest Modulation Employing Cyclodextrin As a Hostmentioning

confidence: 99%

Tuning the Amphiphilicity of Building Blocks: Controlled Self‐Assembly and Disassembly for Functional Supramolecular Materials

2009

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Amphiphilicity is one of the molecular bases for self‐assembly. By tuning the amphiphilicity of building blocks, controllable self‐assembly can be realized. This article reviews different routes for tuning amphiphilicity and discusses different possibilities for self‐assembly and disassembly in a controlled manner. In general, this includes irreversible and reversible routes. The irreversible routes concern irreversible reactions taking place on the building blocks and changing their molecular amphiphilicity. The building blocks are then able to self‐assemble to form different supramolecular structures, but cannot remain stable upon loss of amphiphilicity. Compared to the irreversible routes, the reversible routes are more attractive due to the good control over the assembly and disassembly of the supramolecular structure formed via tuning of the amphiphilicity. These routes involve reversible chemical reactions and supramolecular approaches, and different external stimuli can be used to trigger reversible changes of amphiphilicity, including light, redox, pH, and enzymes. It is anticipated that this line of research can lead to the fabrication of new functional supramolecular assemblies and materials.

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“…The resulting hydrophobic cavity and a hydrophilic outside surface [32,33], support the capability of forming reversible non-covalent host-guest inclusion complexes with hydrophobic molecules such as surfactants [30,[34][35][36]. As a consequence of the binding process, some properties of the target molecules can be dramatically changed.…”

Section: Introductionmentioning

confidence: 84%

“…Cyclodextrins known to form inclusion complexes with surfactants [30,31,[48][49][50][51] M. The changes in the swelling ratio were larger for the hydrogel pre-equilibrated at higher surfactant concentration (Fig. 5).…”

Section: Anionic Hydrogels Equilibrated With Surfactant Immersed In Cmentioning

confidence: 96%

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High resolution interferometry as a tool for characterization of swelling of weakly charged hydrogels subjected to amphiphile and cyclodextrin exposure

Gao

Gawel

Stokke

2013

Journal of Colloid and Interface Science

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A high resolution interferometric technique was used to determine swelling behavior of weakly charged polyacrylamide hydrogels in the presence of oppositely charged surfactants and subsequent exposure to cyclodextrins. Hydrogels of copolymerized acrylamide and 2-acrylamido-2-methyl-1-propanesulfonic acid (0.22, 0.44, 0.88 mol%) and crosslinked with bisacrylamide (3, 6, 12 mol%) were employed. The equilibrium swelling and swelling kinetics of the hydrogels were determined with 2 nanometer resolution of the optical length and sampled at approximately 1 Hz. These properties were determined for the hydrogels exposed to cationic surfactants dodecyltrimethylammonium bromide (DTAB) and cetyltrimethylammonium bromide (CTAB) at concentrations from 10

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A surface tension method for determining binding constants for cyclodextrin inclusion complexes of ionic surfactants

Cited by 120 publications

References 0 publications

The formation of host–guest complexes between surfactants and cyclodextrins

The formation of host–guest complexes between surfactants and cyclodextrins

Tuning the Amphiphilicity of Building Blocks: Controlled Self‐Assembly and Disassembly for Functional Supramolecular Materials

High resolution interferometry as a tool for characterization of swelling of weakly charged hydrogels subjected to amphiphile and cyclodextrin exposure

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