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Protein behavior at the water/methylene chloride interface.

H Sah1

  • 1Department of Pharmaceutical Sciences, The University of Tennessee, College of Pharmacy, Room 214, 26 South Dunlap Street, Memphis, Tennessee 38163, USA. hsah@utmem1.utmem.edu

Journal of Pharmaceutical Sciences
|December 10, 1999
PubMed
Summary

Protein aggregation during emulsification can be reduced by using competitive adsorption. Human serum albumin (HSA) effectively protects Ribonuclease A (RNase) from interface-induced denaturation and aggregation.

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Area of Science:

  • Protein chemistry
  • Interfacial science
  • Biophysical chemistry

Background:

  • Emulsification processes can lead to protein denaturation and aggregation.
  • Understanding protein behavior at interfaces is crucial for stabilizing proteins during processing.

Purpose of the Study:

  • Investigate protein behaviors at the water/methylene chloride interface.
  • Determine the denaturing effects of emulsification on model proteins.
  • Explore strategies to mitigate protein instability during emulsification.

Main Methods:

  • Studied Ribonuclease A (RNase) and human serum albumin (HSA) as model proteins.
  • Analyzed protein recovery, interfacial aggregation, and dynamic interfacial tension.
  • Examined the influence of protein concentration and co-presence on interfacial behavior.

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Main Results:

  • RNase is highly susceptible to interface-induced aggregation, forming insoluble aggregates.
  • HSA undergoes some dimerization/oligomerization but is largely recovered.
  • HSA addition significantly reduced RNase aggregation by competing for interface sites.

Conclusions:

  • Protein instability during emulsification stems from interfacial adsorption and conformational changes.
  • Competitive adsorption is a viable strategy to stabilize proteins against emulsification-induced denaturation.
  • HSA can effectively protect RNase from aggregation at the water/methylene chloride interface.