Detection of Unlabeled Oligonucleotide Targets Using Whispering Gallery Modes in Single, Fluorescent Microspheres
- 26 July 2007
- Vol. 3 (8), 1408-1414
- https://doi.org/10.1002/smll.200600676
Abstract
The development of an inexpensive, highly sensitive, whispering gallery mode (WGM) based biosensing system is demonstrated. The system comprises a silica microsphere functionalized with a fluorophore and a dense monolayer of single-strand oligonucleotides. The adsorption of the complementary strand causes spectral shifts in the emission spectrum of the microsphere that can be registered using a conventional optical microscope and CCD detector. The system is capable of detecting low-abundance, unlabeled-oligonucleotide targets. The spectral shifts can be used to monitor both the hybridization kinetics and the denaturation of the double-strand DNA at elevated temperatures. The hybridization appears to be completely reversible. Complementary oligonucleotide probes more than 30 bases in length are most readily detected while a complete assay takes only a few minutes.Keywords
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