title: Electrochemical deoxyribonucleic acid biosensor based on electrodeposited graphene and nickel oxide nanoparticle modified electrode for the detection of salmonella enteritidis gene sequence.
abstract: In this paper a new electrochemical DNA biosensor was prepared by using graphene (GR) and nickel oxide (NiO) nanocomposite modified carbon ionic liquid electrode (CILE) as the substrate electrode. GR and NiO nanoparticles were electrodeposited on the CILE surface step-by-step to get the nanocomposite. Due to the strong affinity of NiO with phosphate groups of ssDNA, oligonucleotide probe with a terminal 5'-phosphate group could be attached on the surface of NiO/GR/CILE, which could further hybridize with the target ssDNA sequence. Methylene blue (MB) was used as the electrochemical indicator for monitoring the hybridization reaction. Under the optimal conditions the reduction peak current of MB was proportional to the concentration of salmonella enteritidis gene sequence in the range from 1.0×10(-13) to 1.0×10(-6)molL(-1) with a detection limit as 3.12×10(-14)molL(-1). This electrochemical DNA sensor exhibited good discrimination ability to one-base and three-base mismatched ssDNA sequences, and the polymerase chain reaction amplification product of salmonella enteritidis gene sequences were further detected with satisfactory results.
authors: College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, PR China. Electronic address: swyy26@hotmail.com.
authors: Wei
authors: W
authors: Sun
authors: College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, PR China.
authors: Xiuli
authors: X
authors: Wang
authors: College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, PR China.
authors: Yongxi
authors: Y
authors: Lu
authors: College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, PR China.
authors: Shixing
authors: S
authors: Gong
authors: College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, PR China.
authors: Xiaowei
authors: X
authors: Qi
authors: College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, PR China.
authors: Bingxin
authors: B
authors: Lei
authors: College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, PR China.
authors: Zhenfan
authors: Z
authors: Sun
authors: College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, PR China. Electronic address: lgjqust@126.com.
authors: Guangjiu
authors: G
authors: Li
mesh_terms: D015374:Biosensing Techniques; D004247:DNA / Q000032:analysis*; D055664:Electrochemical Techniques / Q000379:methods*; D005798:Genes, Bacterial; D006108:Graphite / Q000737:chemistry*; D053768:Metal Nanoparticles; D008855:Microscopy, Electron, Scanning; D009532:Nickel / Q000737:chemistry*; D012477:Salmonella enteritidis / Q000235:genetics*
chemical_list: D006108:Graphite; D009532:Nickel; D004247:DNA; C028007:nickel monoxide
keywords: Carbon ionic liquid electrode; Electrochemical DNA biosensor; Electrodeposition; Graphene; NiO nanoparticle