title: A simple and sensitive fluorescence biosensor for detection of organophosphorus pesticides using H2O2-sensitive quantum dots/bi-enzyme.
abstract: In this paper, we have developed a simple, fast, convenient and sensitive method for determination of organophosphorus pesticides in real samples based on inhibition mechanism of acetylcholinesterase (AChE). The biosensor is composed of enzymes (AChE and ChOx (choline oxidase)), QDs and acetylcholine (ACh), without any complex process of assembly for biosensor. After the experimental conditions are optimized, the limit of detection (LOD) for dichlorvos (DDVP) is found to be 4.49nM. Two linear ranges allow a wide determination of DDVP concentration from 4.49nM to 6780nM. Furthermore, a possible mechanism is put forward to explain the fluorescence quenching of CdTe QDs in the presence of H2O2. More importantly, the obtained biosensor is proven to be suitable for the detection of residues of organophosphorus pesticides (OPs) in real examples. The excellent performance of this biosensor will facilitate future development of rapid and high-throughput detection of organophosphorus pesticides.
authors.affiliation: Laboratory of Controllable Preparation and Application of Nanomaterials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, No. 29, Zhongguancun East Road, Haidian District, Beijing 100190, People's Republic of China.
authors.forename: Xianwei
authors.initials: X
authors.lastname: Meng
authors.forename: Jianfei
authors.initials: J
authors.lastname: Wei
authors.forename: Xiangling
authors.initials: X
authors.lastname: Ren
authors.forename: Jun
authors.initials: J
authors.lastname: Ren
authors.forename: Fangqiong
authors.initials: F
authors.lastname: Tang
mesh_terms: D000109:Acetylcholine / Q000737:chemistry; D000110:Acetylcholinesterase / Q000737:chemistry; D015374:Biosensing Techniques / Q000379:methods*; D005453:Fluorescence; D006861:Hydrogen Peroxide / Q000737:chemistry / Q000302:isolation & purification; D057230:Limit of Detection; D009943:Organophosphorus Compounds / Q000302:isolation & purification*; D010575:Pesticides / Q000302:isolation & purification*; D045663:Quantum Dots / Q000737:chemistry
chemical_list: D009943:Organophosphorus Compounds; D010575:Pesticides; D006861:Hydrogen Peroxide; D000110:Acetylcholinesterase; D000109:Acetylcholine