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Protein Denaturation in Foam.

Clarkson1, Cui, Darton

  • 1Department of Engineering Science, University of Oxford, Parks Road, Oxford, OX1 3PJ, England

Journal of Colloid and Interface Science
|July 27, 1999
PubMed
Summary

Protein denaturation in foam primarily occurs at the gas-liquid interface, not through oxidation or shear stress. The extent of damage depends on interfacial exposure, with significant differences observed between Bovine Serum Albumin (BSA) and pepsin.

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Area of Science:

  • Biochemistry
  • Physical Chemistry
  • Materials Science

Background:

  • Foam processing is common in various industries.
  • Understanding protein denaturation in foam is crucial for product stability and quality.
  • Previous hypotheses attributed protein damage mainly to oxidation or shear stress.

Purpose of the Study:

  • To investigate the primary mechanism of protein denaturation within foam.
  • To quantify the extent of denaturation for different proteins under foam conditions.
  • To differentiate the roles of surface denaturation, oxidation, and shear stress.

Main Methods:

  • Studying protein adsorption and desorption at the gas-liquid interface.
  • Correlating protein denaturation with interfacial exposure and interface mobility.
  • Comparing denaturation levels of Bovine Serum Albumin (BSA) and pepsin in foam.

Main Results:

  • Surface denaturation at the gas-liquid interface is the predominant cause of protein damage in foam.
  • Interfacial exposure, enhanced by drainage in mobile interfaces, directly correlates with denaturation.
  • Around 10% of adsorbed BSA and 75% of adsorbed pepsin remained denatured upon desorption.
  • Oxidation and shear stress were found to be minimal contributors to protein denaturation.

Conclusions:

  • Protein denaturation in foam is mainly a surface phenomenon.
  • The degree of denaturation is protein-specific and influenced by interfacial dynamics.
  • Foam processing conditions significantly impact protein structural integrity.

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