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Updated: Jun 10, 2026

Sigma's Non-specific Protease Activity Assay - Casein as a Substrate

Sigma's Non-specific Protease Activity Assay - Casein as a Substrate

Published on: September 17, 2008

Interaction between casein and sodium dodecyl sulfate.

Yan Liu¹, Rong Guo

¹College of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002, PR China.

Journal of Colloid and Interface Science

|August 8, 2007

Summary

This summary is machine-generated.

Sodium dodecyl sulfate (SDS) interacts with casein micelles through hydrophobic binding. SDS forms aggregates on casein chains below its typical micellar concentration, altering micelle structure and probe binding.

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Area of Science:

Biochemistry
Colloid and Surface Chemistry

Background:

Casein, a major milk protein, forms complex micellar structures.
Anionic surfactants like sodium dodecyl sulfate (SDS) can interact with proteins, influencing their structure and function.

Purpose of the Study:

To investigate the interaction mechanism between sodium dodecyl sulfate (SDS) and casein micelles.
To determine the effect of SDS on casein micelle size and structure.

Main Methods:

Isothermal titration calorimetry (ITC) to quantify binding thermodynamics.
Dynamic light scattering (DLS) to measure changes in micelle size.
Fluorescence spectroscopy to probe conformational changes.

Main Results:

SDS binds to casein micelles via hydrophobic interactions, forming aggregates at a critical aggregation concentration (c1) below SDS's critical micellar concentration (cmc).
SDS binding increases casein micelle hydrodynamic radius above 4 mM and dissociates micelles into monomers/submicelles above 10 mM.
Changes in hydrophobic probe binding to casein suggest structural alterations induced by SDS.

Conclusions:

SDS significantly alters casein micelle structure through concentration-dependent binding and aggregation.
These findings provide insights into protein-surfactant interactions relevant to food science and biotechnology.