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Mussel-Inspired Universal Bioconjugation of Polydiacetylene Liposome for Droplet-Array Biosensors.
ACS Applied Materials & Interfaces 2017 December 7
Most solid-state biosensor platforms require a specific immobilization chemistry and a bioconjugation strategy separately to tether sensory molecules to a substrate and attach specific receptors to the sensory unit, respectively. We developed a mussel-inspired universal conjugation method that enables both surface immobilization and bioconjugation at the same time. By incorporating dopamine or catechol moiety into self-signaling polydiacetylene (PDA) liposomes, we demonstrated efficient immobilization of the PDA liposomes to a wide range of substrates, without any substrate modification. Moreover, receptor molecules having a specificity toward a target molecule can also be attached to the immobilized PDA liposome layer without any chemical modification. We applied our mussel-inspired conjugation method to a droplet-array biosensor by exploiting the hydrophilic nature of PDA liposomes coated on a hydrophobic polytetrafluoroethylene surface and demonstrated selective and sensitive detection of vascular endothelial growth factor down to 10 nM.
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