tetano
Editor, Senior Moderator
Biosens Bioelectron. 2012 Mar 3. [Epub ahead of print]
Ultrasensitive and label-free detection of pathogenic avian influenza DNA by using CMOS impedimetric sensors.
Lai WA, Lin CH, Yang YS, Lu MS.
Source
Institute of Electronics Engineering, National Tsing Hua University, Hsinchu 300, Taiwan, ROC.
Abstract
This work presents miniaturized CMOS (complementary metal oxide semiconductor) sensors for non-faradic impedimetric detection of AIV (avian influenza virus) oligonucleotides. The signal-to-noise ratio is significantly improved by monolithic sensor integration to reduce the effect of parasitic capacitances. The use of sub-μm interdigitated microelectrodes is also beneficial for promoting the signal coupling efficiency. Capacitance changes associated with surface modification, functionalization, and DNA hybridization were extracted from the measured frequency responses based on an equivalent-circuit model. Hybridization of the AIV H5 capture and target DNA probes produced a capacitance reduction of -13.2?2.1% for target DNA concentrations from 1fM to 10fM, while a capacitance increase was observed when H5 target DNA was replaced with non-complementary H7 target DNA. With the demonstrated superior sensing capabilities, this miniaturized CMOS sensing platform shows great potential for label-free point-of-care biosensing applications.
Copyright © 2012 Elsevier B.V. All rights reserved.
PMID:
22425237
[PubMed - as supplied by publisher]
http://www.ncbi.nlm.nih.gov/pubmed/22425237
Ultrasensitive and label-free detection of pathogenic avian influenza DNA by using CMOS impedimetric sensors.
Lai WA, Lin CH, Yang YS, Lu MS.
Source
Institute of Electronics Engineering, National Tsing Hua University, Hsinchu 300, Taiwan, ROC.
Abstract
This work presents miniaturized CMOS (complementary metal oxide semiconductor) sensors for non-faradic impedimetric detection of AIV (avian influenza virus) oligonucleotides. The signal-to-noise ratio is significantly improved by monolithic sensor integration to reduce the effect of parasitic capacitances. The use of sub-μm interdigitated microelectrodes is also beneficial for promoting the signal coupling efficiency. Capacitance changes associated with surface modification, functionalization, and DNA hybridization were extracted from the measured frequency responses based on an equivalent-circuit model. Hybridization of the AIV H5 capture and target DNA probes produced a capacitance reduction of -13.2?2.1% for target DNA concentrations from 1fM to 10fM, while a capacitance increase was observed when H5 target DNA was replaced with non-complementary H7 target DNA. With the demonstrated superior sensing capabilities, this miniaturized CMOS sensing platform shows great potential for label-free point-of-care biosensing applications.
Copyright © 2012 Elsevier B.V. All rights reserved.
PMID:
22425237
[PubMed - as supplied by publisher]
http://www.ncbi.nlm.nih.gov/pubmed/22425237