Heavy metal ion hydrogelation of a self-assembling peptideviacysteinyl chelation
Journal of Materials Chemistry2011Vol. 22(4), pp. 1352–1357
Citations Over TimeTop 12% of 2011 papers
Abstract
Hydrogel materials are finding use in heavy metal ion detection and remediation. MBHP is a twenty-residue peptide capable of undergoing hydrogelation in response to heavy metal ion binding. The unstructured peptide binds monomethylarsonous acid, Pb2+, Zn2+, Cd2+ or Hg2+ and subsequently folds into an amphiphilic β-hairpin that rapidly self-assembles into a β-sheet rich fibrillar network as shown by CD spectroscopy and transmission electron microscopy. LCMS shows that MBHP binds metal ions with a 1 : 1 stoichiometry. Oscillatory rheology indicates that moderately rigid hydrogels are formed as a result of metal ion binding, peptide folding and ultimate self-assembly with storage moduli (G′) ranging from ∼1000–4000 Pa.
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