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Micelles

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...

Colloids

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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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...

Membrane Domains

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Asymmetric Lipid Bilayer

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Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...

Fluid Mosaic Model

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Scientists identified the plasma membrane in the 1890s and its principal chemical components (lipids and proteins) by 1915. The model for plasma membrane structure, proposed in 1935 by Hugh Davson and James Danielli, was the first model to be widely accepted in the scientific community. The model was based on the plasma membrane's "railroad track" appearance in early electron micrographs. Davson and Danielli theorized that the plasma membrane's structure resembled a sandwich with the analogy of...

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Related Experiment Video

Updated: May 24, 2026

Synthesis of Monocyte-targeting Peptide Amphiphile Micelles for Imaging of Atherosclerosis

Synthesis of Monocyte-targeting Peptide Amphiphile Micelles for Imaging of Atherosclerosis

Published on: November 17, 2017

Casein micelles and their internal structure.

Cornelis G de Kruif¹, Thom Huppertz, Volker S Urban

¹NIZO food research, PO Box 20, 6710 BA, Ede, The Netherlands. kees.dekruif@nizo.nl

Advances in Colloid and Interface Science

|March 3, 2012

Summary

The nanocluster model best explains casein micelle structure, revealing a homogeneous matrix with dispersed colloidal calcium phosphate nanoclusters. This model accounts for scattering data and micelle stability through weak interactions and kappa-casein regulation.

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Area of Science:

Biophysical Chemistry
Colloid Science
Food Science

Background:

Casein micelles are complex colloidal particles crucial for milk structure and nutrition.
Understanding their internal structure is key to explaining their stability and functionality.
Previous models, including sub-micelle and dual binding, have attempted to describe micelle organization.

Purpose of the Study:

To elucidate the internal structure and component distribution within casein micelles.
To test the validity of different structural models (sub-micelle, nanocluster, dual binding) against experimental data.
To investigate the role of colloidal calcium phosphate (CCP) and protein interactions in micelle formation.

Main Methods:

Analysis of small-angle neutron and X-ray scattering (SANS, SAXS) and static light scattering (SLS) spectra.
Self-consistent prediction of scattering spectra using independently determined parameters (composition, size, density, etc.).
Internal cross-linking with transglutaminase to form stable casein nanogel particles for comparative analysis.

Main Results:

The radius of gyration was found to be independent of scattering contrast, indicating homogeneous mass distribution.
SANS and SAXS data strongly supported the nanocluster model over other proposed structures.
Casein nanogel particles, formed by cross-linking, exhibited stability in urea and after calcium sequestration, unlike native micelles.

Conclusions:

The nanocluster model, featuring dispersed CCP nanoclusters within a casein matrix, accurately describes casein micelle internal structure.
Micelle stability is attributed to cooperative self-association driven by weak interactions, with kappa-casein playing a key role in limiting this association.
The findings provide a refined understanding of casein micelle architecture, essential for dairy science and food technology.