Interactions of Bovine Serum Albumin with Ethylene Oxide/Butylene Oxide Copolymers in Aqueous Solution
| Autor: | Ian W. Hamley, Vasiliki Havredaki, Marta J. Krysmann, Valeria Castelletto, Antonios Kelarakis, Kyriakos Viras |
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| Rok vydání: | 2008 |
| Předmět: |
Polymers and Plastics
Protein Conformation Oxide Bioengineering Micelle Phase Transition Polyethylene Glycols Biomaterials chemistry.chemical_compound Dynamic light scattering Polymer chemistry Materials Chemistry Copolymer Animals Bovine serum albumin Micelles Aqueous solution biology Ethylene oxide Small-angle X-ray scattering Water Serum Albumin Bovine Solutions chemistry biology.protein Epoxy Compounds Gels |
| Zdroj: | Biomacromolecules. 9:1366-1371 |
| ISSN: | 1526-4602 1525-7797 |
| Popis: | The interactions of bovine serum albumin (BSA) with three ethylene oxide/butylene oxide (E/B) copolymers having different block lengths and varying molecular architectures is examined in this study in aqueous solutions. Dynamic light scattering (DLS) indicates the absence of BSA-polymer binding in micellar systems of copolymers with lengthy hydrophilic blocks. On the contrary, stable protein-polymer aggregates were observed in the case of E 18B 10 block copolymer. Results from DLS and SAXS suggest the dissociation of E/B copolymer micelles in the presence of protein and the absorption of polymer chains to BSA surface. At high protein loadings, bound BSA adopts a more compact conformation in solution. The secondary structure of the protein remains essentially unaffected even at high polymer concentrations. Raman spectroscopy was used to give insight to the configurations of the bound molecules in concentrated solutions. In the vicinity of the critical gel concentration of E 18B 10 introduction of BSA can dramatically modify the phase diagram, inducing a gel-sol-gel transition. The overall picture of the interaction diagram of the E 18B 10-BSA reflects the shrinkage of the suspended particles due to destabilization of micelles induced by BSA and the gelator nature of the globular protein. SAXS and rheology were used to further characterize the structure and flow behavior of the polymer-protein hybrid gels and sols. |
| Databáze: | OpenAIRE |
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