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Related Concept Videos

Micelles01:30

Micelles

Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
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Surface Active Agents

Surfactants, named for their behavior at interfaces, positively adsorb at the interfaces of two phases, reducing interfacial tension. Their versatility as emulsifiers, detergents, and foaming agents stems from this ability. Surfactants, often termed amphiphiles, share the property of amphipathy, with molecules having both hydrophilic and hydrophobic portions. The hydrophilic part is called the head, and the hydrophobic part, including an elongated alkyl substituent, forms the tail.Surfactants...
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Detergent Purification of Membrane Proteins

Detergents are used to purify the integral proteins of the membrane. The hydrophobic portion of the detergent can replace membrane phospholipids while solubilizing the membrane proteins. When detergent monomers reach a specific concentration in a solution called critical micelle concentration (CMC), they form micelles. Above CMC, the concentration of the detergent monomers remains in equilibrium with the micelle. The number of detergent monomers present in the CMC varies for each detergent, and...
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
Bioavailability Enhancement: Drug Solubility Enhancement01:16

Bioavailability Enhancement: Drug Solubility Enhancement

Bioavailability is a critical factor in determining a drug's effectiveness. It refers to the proportion of a drug that enters the circulation when introduced into the body and is, as a result, able to have an active effect. Enhancing bioavailability is essential for drugs with poor solubility, as it can significantly impact their therapeutic efficacy. Various methods are employed to increase the solubility of drugs, thereby enhancing their bioavailability.Micronization and nanonization are...
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Factors Affecting Dissolution: Particle Size and Effective Surface Area

Dissolution kinetics, an essential aspect of oral drug delivery, is significantly influenced by the drug's particle size. According to the Noyes-Whitney dissolution model, the dissolution rate correlates directly with the drug's surface area. The larger the surface area, the higher the drug's solubility in water, leading to a faster drug dissolution rate. Reducing particle size increases the effective surface area, enhancing the dissolution process. Micronization and nanosizing are employed to...

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Updated: May 16, 2026

Studying Surfactant Effects on Hydrate Crystallization at Oil-Water Interfaces Using a Low-Cost Integrated Modular Peltier Device
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Competition between surfactant micellization and complexation by cyclodextrin.

M Cepeda1, R Daviña, L García-Río

  • 1Facultad de Química, Pontificia Universidad Católica de Chile, Casilla 306, 6094411 Santiago, Chile.

Organic & Biomolecular Chemistry
|November 24, 2012
PubMed
Summary
This summary is machine-generated.

This study investigated supramolecular systems of surfactants and beta-cyclodextrin. Uncomplexed cyclodextrin was observed, with its concentration influenced by surfactant chain length and micelle formation.

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Area of Science:

  • Supramolecular Chemistry
  • Physical Chemistry

Background:

  • Surfactant-cyclodextrin interactions are crucial in various chemical and biological processes.
  • Understanding the equilibrium between free and complexed cyclodextrin in micellar solutions is key.

Purpose of the Study:

  • To quantify the concentration of uncomplexed beta-cyclodextrin in equilibrium with alkyltrimethylammonium surfactant micelles.
  • To investigate the effect of surfactant alkyl chain length on cyclodextrin complexation and micellization.

Main Methods:

  • Utilized a chemical probe, 4-methoxybenzenesulfonyl chloride (MBSC), to monitor solvolysis.
  • Employed a series of alkyltrimethylammonium surfactants with varying hydrocarbon chain lengths (C6-C18).
  • Analyzed the interplay between cyclodextrin complexation and surfactant self-assembly into micelles.

Main Results:

  • Significant concentrations of uncomplexed beta-cyclodextrin were detected in all studied micellar systems.
  • The percentage of uncomplexed cyclodextrin exhibited a minimum for surfactants with alkyl chain lengths of 10-12 carbons.
  • Observed behavior was attributed to the simultaneous processes of surfactant monomer complexation by cyclodextrin and surfactant micellization.

Conclusions:

  • The concentration of uncomplexed cyclodextrin is quantitatively dependent on surfactant chain length and micellar aggregation.
  • Thermodynamic principles, specifically Gibbs free energies of micellization and complexation, successfully explain the observed phenomena.
  • This research provides insights into the complex equilibria governing supramolecular systems formed by surfactants and cyclodextrins.