Electrochemical biosensor for the multiplexed detection of human papillomavirus genes

A proof-of-concept of an electrochemical genosensor array for the individual and simultaneous detection of two high-risk human papillomavirus DNA sequences, HPV16E7p and HPV45E6 that exhibits high sensitivity and selectivity is reported. The optimum conditions for surface chemistry preparation and detection of hybridised target were investigated. The LOD obtained are in the pM range, which are sufficient for most real RNA/DNA samples obtained from PCR amplification, usually in the nanomolar range. In a multiplexed detection format, high selectivity was observed over the non-specific sequence, opening the way for the development of an electrochemical high throughput screening assay for multiple high-risk DNA sequences. (C) 2010 Elsevier B.V. All rights reserved.