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Published online by Cambridge University Press: 18 May 2012
A synthetic strategy to couple selectively an ionic complementary thiol modified octapeptide, that is able to gel at low temperature, to the thermoresponsive polymer poly(N-isopropylacrylamide) (pNIPAAm) with controlled molecular weight and narrow polydispersity is described. The polymer was synthesized by atom transfer radical polymerization (ATRP) affording halogen functionalized chain ends. This allowed subsequent coupling to a thiol terminated ionic complementary octapeptide via nucleophile substitution. Results indicated that the peptide was covalently attached to the polymer and that both the coil-globule phase transition of pNIPAAm and the gelation properties of the peptide were retained in the conjugated product. This method provides a versatile route for the synthesis of a range of bioconjugate materials with controlled architecture and dual self-assembling and thermoresponsive behavior.