DNA-directed protein immobilization for simultaneous detection of multiple analytes by surface plasmon resonance biosensor

Analytical Chemistry
Christina BoozerShaoyi Jiang

Abstract

A versatile multichannel biosensor surface is prepared by site-directed immobilization of single-stranded DNA-protein conjugates onto a patterned self-assembled monolayer composed of ssDNA thiols and oligo(ethylene glycol)-terminated thiols. The conjugates each consist of an antibody chemically linked to a unique ssDNA target with a sequence complementary to the surface-bound ssDNA probes and are immobilized on the surface via sequence-specific hybridization. The exceptional specificity of DNA hybridization combined with the diversity of available sequences makes this platform perfect for multichannel sensors. Once the surface is patterned with the appropriate probe sequences, sequence-specific hybridization sorts out the target conjugates and directs them to the appropriate spots on the surface. Previously (Boozer, C. L.; Ladd, J.; Chen, S.; Yu, Q.; Homola, J.; Jiang, S. Anal. Chem. 2004, 76, 6967-6972), we performed proof-of-concept experiments demonstrating the feasibililty of using DNA-directed protein immobilization to produce a single channel biosensor. In this work, we extend this technique and employ DNA-directed protein immobilization to functionalize a multichannel biosensor, which was used for the simultaneous detect...Continue Reading

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