Immobilization of Antimicrobial Peptide IG-25 onto Fluoropolymers via Fluorous Interactions and Click Chemistry

Catherine Santos, Amit Kumar, Satya Kolar, Rafael Contreras-Caceres, Alison McDermott, Chengzhi Cai

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)


We report a practical method for biofunctionalization of fluoropolymers based on noncovalent, fluorous interactions and click chemistry that allows incorporation of biomolecules under physiological solutions. We demonstrate the method by immobilization of an antimicrobial peptide (AMP) on fluorous thin films and fluorosilicone contact lens. The fluorous surfaces were dip-coated with fluorous-tagged oligo(ethylene) chain terminated with a reactive group, such as an alkynyl group. This simple step generates a “clickable” surface. The noncovalent fluorous interaction was strong enough to allow subsequent covalent attachment of IG-25, a truncated version of the most extensively studied human AMP LL-37. The attachment was through copper-catalyzed click reaction between the alkynyl group on the surface and the azido-OEG tag at the N-terminus of IG-25. In comparison to surfaces presenting IG-25 randomly bound via carbodiimide chemistry, the surfaces presenting IG-25 tethering to the surface at the N-terminus via click chemistry displayed higher antibacterial activities against an ocular pathogen Pseudomonas aeruginosa (strain PA-O1).
Original languageEnglish
Pages (from-to)12789-12793
JournalACS Applied Materials and Interfaces
Issue number24
Early online date22 Nov 2013
Publication statusPublished - 26 Dec 2013


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