title: A novel fluorescent biosensor for sequence-specific recognition of double-stranded DNA with the platform of graphene oxide.
abstract: A fluorescent biosensor for sequence-specific recognition of double-stranded DNA (dsDNA) was developed based upon the DNA hybridization between dye-labeled single-stranded DNA (ssDNA) and double-stranded DNA. The fluorescence of FAM-labeled single-stranded DNA was quenched when it adsorbed on the surface of graphene oxide (GO). Upon addition of the target dsDNA, a homopyrimidine·homopurine part of dsDNA on the Simian virus 40 (SV40) (4424-4440, gp6), hybridization occurred between the dye-labeled DNA and the target dsDNA, which induced the dye-labeled DNA desorbed from the surface of GO, and turned on the fluorescence of the dye. Under the optimum conditions, the enhanced fluorescence intensity was proportional to the concentration of target dsDNA in the range 40.0-260 nM, and the detection limit was found to be 14.3 nM alongside the good sequence selectivity.
authors: School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou, PR China.
authors: Chengke
authors: C
authors: Wu
authors: Yamin
authors: Y
authors: Zhou
authors: Xiangmin
authors: X
authors: Miao
authors: Liansheng
authors: L
authors: Ling
mesh_terms: D001483:Base Sequence; D015374:Biosensing Techniques / Q000379:methods*; D004247:DNA / Q000032:analysis*; D015342:DNA Probes / Q000737:chemistry; D004277:DNA, Single-Stranded / Q000032:analysis; D005456:Fluorescent Dyes / Q000737:chemistry*; D006108:Graphite / Q000737:chemistry*; D009693:Nucleic Acid Hybridization; D010087:Oxides / Q000737:chemistry*; D013539:Simian virus 40 / Q000235:genetics; D013050:Spectrometry, Fluorescence / Q000379:methods
chemical_list: D015342:DNA Probes; D004277:DNA, Single-Stranded; D005456:Fluorescent Dyes; D010087:Oxides; D006108:Graphite; D004247:DNA