Journal
BIOSENSORS & BIOELECTRONICS
Volume 16, Issue 9-12, Pages 1109-1118Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/S0956-5663(01)00239-1
Keywords
peptide nucleic acid (PNA); DNA; plasmon
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Plasmon surface polaritons, resonantly excited in the Kretschmann format, are used to enhance the fluorescence emission of chromophore-labeled oligonucleotides (15mers) binding to surface-attached (via biotin-streptavidin linkages) complement catcher probes. A detailed analysis of the association and dissociation kinetics as well as the affinity constants is given for a mismatch I hybrid, emphasizing, in particular, the experimental conditions that are required to allow for an artifact-free determination of rate constants. A first comparison between DNA- and peptide nucleic acid (PNA-) probes shows similar affinities, however, significant deviations from single-exponential kinetics predicted by a simple Langmuir model for the PNA case are found. (C) 2001 Elsevier Science B.V. All rights reserved.
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