Journal
MACROMOLECULAR RAPID COMMUNICATIONS
Volume 32, Issue 4, Pages 354-359Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.201000619
Keywords
bioconjugates; block copolymers; reversible addition-fragmentation chain transfer (RAFT); stimuli-sensitive polymers
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Funding
- National Science Foundation [CAREER DMR-0846792]
- Alfred P. Sloan Research Fellowship
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0846792] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1265388] Funding Source: National Science Foundation
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Well-defined smart'' block copolymer-protein conjugates were prepared by two consecutive grafting-from'' reactions via reversible addition-fragmentation chain transfer (RAFT) polymerization. The initiating portion (R-group) of the RAFT agent was anchored to a model protein such that the thiocarbonylthio moiety was readily accessible for chain transfer with propagating chains in solution. Well-defined polymer-protein conjugates of poly(N-isopropylacrylamide) (PNIPAM) and bovine serum albumin (BSA) were prepared at room temperature in aqueous media. The retained trithiocarbonate moiety on the free end group of the immobilized polymer allowed the homopolymer conjugate to be extended by polymerization of N, N-dimethylacrylamide. Polyacrylamide gel electrophoresis, size exclusion chromatography, and NMR spectroscopy confirmed the synthesis of the various conjugates and revealed that the polymerizations were well controlled. As expected, the resulting block copolymer-protein conjugates demonstrated thermoresponsive behavior due to the temperature-sensitivity of the PNIPAM block, as evidenced by turbidity measurements and dynamic light scattering analysis.
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