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Related Concept Videos

Surface Active Agents01:27

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...
Globular Proteins01:27

Globular Proteins

In organisms, proteins are the most abundant macromolecules. They act as the building blocks of life and play various crucial roles in the body. Proteins can be broadly classified into two distinct subtypes based on their shape and solubilities: globular proteins and fibrous proteins.
Globular proteins serve many important physiological functions, such as acting as enzymes, cellular messengers, and molecular transporters. These roles often require the proteins to be soluble in the aqueous...
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...
Solubility03:00

Solubility

Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules, atoms, and/or ions)...
Detergent Purification of Membrane Proteins01:18

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...
Colloids03:22

Colloids

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...

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Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces
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On relationships between surfactant type and globular proteins interactions in solution.

Elena Blanco1, Juan M Ruso, Gerardo Prieto

  • 1Group of Biophysics and Interfaces, Department of Applied Physics, Faculty of Physics, University of Santiago de Compostela, E-15782 Santiago de Compostela, Spain.

Journal of Colloid and Interface Science
|August 21, 2007
PubMed
Summary

This study characterized surfactant binding to proteins like myoglobin and ovalbumin using electrophoretic mobility. Hydrophobic interactions predominantly drive surfactant binding, influencing protein charge and Gibbs energies.

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Area of Science:

  • Biophysical Chemistry
  • Protein-Surfactant Interactions
  • Surface Chemistry

Background:

  • Proteins interact with various molecules, including surfactants, influencing their structure and function.
  • Understanding these interactions is crucial for applications in biochemistry and materials science.
  • Surfactant binding to proteins can alter protein charge, conformation, and biological activity.

Purpose of the Study:

  • To characterize the binding of different surfactants (sodium perfluorooctanoate, sodium octanoate, lithium perfluorooctanoate, sodium dodecanoate) to myoglobin, ovalbumin, and catalase.
  • To investigate the role of protein structure, specifically alpha-helix content, in surfactant binding.
  • To determine the thermodynamic parameters (Gibbs energy) of these binding interactions.

Main Methods:

  • Electrophoretic mobility measurements were used to characterize protein-surfactant complexes.
  • Zeta potential changes were monitored as a function of surfactant concentration.
  • Hydrophobic interactions were identified as the primary driving force for binding.
  • Gibbs energies of binding were evaluated to quantify the interaction strength.

Main Results:

  • Protein charge changes upon surfactant binding followed the order catalase < ovalbumin < myoglobin, correlating with alpha-helix content.
  • Surfactant binding affinity varied, with orders like C8HONa < C8FONa < C8FOLi < C12HONa observed for catalase and ovalbumin.
  • Negative and large Gibbs energies at low surfactant concentrations indicated strong binding to high-energy sites, suggesting a saturation process.

Conclusions:

  • Hydrophobic interactions are the predominant force governing surfactant binding to these proteins.
  • The extent of surfactant binding and its thermodynamic favorability are influenced by both the protein's structural characteristics and the surfactant's properties.
  • Electrophoretic mobility is a valuable technique for elucidating protein-surfactant interactions and their underlying mechanisms.