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Improvement of interfacial protein stability by CHAPS.
1College of Pharmacy, Ewha Womans University, 11-1 Daehyun-Dong, Seodaemun-Gu, Seoul 125-720, Korea. hsah@ewha.ac.kr
Biotechnology Letters
|April 15, 2006
Summary
The surfactant CHAPS (3-[(3-cholamidopropyl)dimethylammonio]-1-propanesulfonate) prevents protein aggregation at oil-water interfaces. It significantly improves recovery of beta-lactoglobulin and ovalbumin, stabilizing them in solution.
Area of Science:
- Protein chemistry
- Surfactant science
- Biophysical chemistry
Background:
- Emulsification of aqueous protein solutions in methylene chloride leads to insoluble aggregate formation at the interface.
- This process results in low recovery rates for proteins like beta-lactoglobulin and ovalbumin in the aqueous phase.
Purpose of the Study:
- To investigate the effect of surfactants on protein stability and recovery during emulsification.
- To determine if CHAPS can prevent protein aggregation and improve recovery at the water/methylene chloride interface.
Main Methods:
- Aqueous solutions of beta-lactoglobulin and ovalbumin were emulsified in methylene chloride.
- The effect of adding 5 mM CHAPS and sodium taurocholate on protein recovery was assessed.
- Protein unfolding and oligomerization induced by CHAPS were analyzed.
Main Results:
- Without CHAPS, recovery of beta-lactoglobulin and ovalbumin was low (36% and 44%).
- Addition of 5 mM CHAPS increased beta-lactoglobulin recovery to 96% and stabilized proteins at the interface.
- Sodium taurocholate did not improve protein recovery; CHAPS showed protein-specific and concentration-dependent effects, causing ovalbumin unfolding at higher concentrations.
Conclusions:
- CHAPS effectively stabilizes proteins at the water/methylene chloride interface, significantly enhancing recovery.
- The stabilizing effect of CHAPS is concentration-dependent and specific to the protein.
- CHAPS can prevent the formation of water-insoluble aggregates during emulsification.