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Zhang P, Fu C, Xiao Y, Zhang Q, Ding C. Copper(II) complex as a turn on fluorescent sensing platform for acetylcholinesterase activity with high sensitivity. Talanta 2019; 208:120406. [PMID: 31816742 DOI: 10.1016/j.talanta.2019.120406] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2018] [Revised: 08/14/2019] [Accepted: 09/27/2019] [Indexed: 10/25/2022]
Abstract
Acetylcholinesterase (AChE) is an important enzyme associated with many nervous diseases, demonstrating the great need for smarter sensing platform with improved sensitivity, selectivity and simplified operation. A "turn on" fluorometric assay is described herein for AChE activity detection, according to the specific enzyme catalyzed reaction of acetylcholine (ATCh) by AChE, which generates thiocholine (TCh) as the product. The well-designed fluorescent probe HBTP possesses ESIPT (Excited State Intramolecular Proton Transfer) nature, leading to a larger Stokes shift, which could be quenched upon coordination with Cu2+. The fluorescence-silent HBTP-Cu2+ complex could be broken by TCh generated from reaction of ATCh with AChE, giving rise to HBTP release which originates from competitive coordination of TCh with Cu2+. This complex probe HBTP-Cu2+ offers a limit detection as low as 0.02 mU mL-1, which is lower than most reported literatures. Furthermore, both HBTP-Cu2+ and HBTP show little toxicity to live cells and is available in visualizing cellular AChE activity.
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Affiliation(s)
- Peng Zhang
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, Shandong Key Laboratory of Biochemical Analysis, Key Laboratory of Analytical Chemistry for Life Science in Universities of Shandong, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, PR China
| | - Caixia Fu
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, Shandong Key Laboratory of Biochemical Analysis, Key Laboratory of Analytical Chemistry for Life Science in Universities of Shandong, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, PR China
| | - Yuzhe Xiao
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, Shandong Key Laboratory of Biochemical Analysis, Key Laboratory of Analytical Chemistry for Life Science in Universities of Shandong, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, PR China
| | - Qian Zhang
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, Shandong Key Laboratory of Biochemical Analysis, Key Laboratory of Analytical Chemistry for Life Science in Universities of Shandong, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, PR China
| | - Caifeng Ding
- Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, MOE, Shandong Key Laboratory of Biochemical Analysis, Key Laboratory of Analytical Chemistry for Life Science in Universities of Shandong, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao, 266042, PR China.
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2
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Gao N, He C, Ma M, Cai Z, Zhou Y, Chang G, Wang X, He Y. Electrochemical co-deposition synthesis of Au-ZrO 2-graphene nanocomposite for a nonenzymatic methyl parathion sensor. Anal Chim Acta 2019; 1072:25-34. [PMID: 31146862 DOI: 10.1016/j.aca.2019.04.043] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Revised: 04/10/2019] [Accepted: 04/18/2019] [Indexed: 11/18/2022]
Abstract
For the first time, a simple electrochemical co-deposition was utilized to synthesis the gold and zirconia nanocomposites modified graphene nanosheets on glassy carbon electrode (Au-ZrO2-GNs/GCE) for electrocatalytic analysis of methyl parathion (MP). According to Field-Emission Scanning Electron Microscopy (FE-SEM), Transmission Electronic Microscopy (TEM) and X-Ray Diffraction (XRD), the gold nanoparticles were uniformly distributed on the surface of graphene-based nanocomposite. The Au-ZrO2-GNs/GCE based sensor exhibited superior capacity for MP detection, ascribed to the strong affinity of zirconia towards the phosphoric group, as well as the high catalytic activity and good conductivity of Au-GNs. The best fabrication and work conditions were then obtained by systematically optimization of the electrodeposition process, pH value and enrichment time. Compared to the gold nanoparticles, zirconia or graphene modified electrodes, AuZrO2-GNs/GCE sensor displayed superior electro-catalytic response toward MP oxidation. The sensor response current of square wave voltammetry was highly linearly correlated with the MP concentrations range of 1-100 ng mL-1 and 100-2400 ng mL-1 with the detection limit of 1 ng mL-1. The Au-ZrO2-GNs/GCE nanocomposite sensor showed excellent accuracy and reproducibility for detection of MP in Chinese cabbage samples, providing a new method for efficient pesticide detection in practical applications.
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Affiliation(s)
- Nan Gao
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, School of Materials Science and Engineering, Hubei University, No. 368 Youyi Avenue, Wuchang, Wuhan, 430062, China
| | - Chaohui He
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, School of Materials Science and Engineering, Hubei University, No. 368 Youyi Avenue, Wuchang, Wuhan, 430062, China
| | - Mingyu Ma
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, School of Materials Science and Engineering, Hubei University, No. 368 Youyi Avenue, Wuchang, Wuhan, 430062, China
| | - Zhiwei Cai
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, School of Materials Science and Engineering, Hubei University, No. 368 Youyi Avenue, Wuchang, Wuhan, 430062, China
| | - Yang Zhou
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, School of Materials Science and Engineering, Hubei University, No. 368 Youyi Avenue, Wuchang, Wuhan, 430062, China
| | - Gang Chang
- School of Materials Science and Engineering, Hubei University, No.368 Youyi Avenue, Wuchang, Wuhan, 430062, China.
| | - Xianbao Wang
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, School of Materials Science and Engineering, Hubei University, No. 368 Youyi Avenue, Wuchang, Wuhan, 430062, China
| | - Yunbin He
- School of Materials Science and Engineering, Hubei University, No.368 Youyi Avenue, Wuchang, Wuhan, 430062, China.
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3
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Li C, Bai G, Zhang Y, Zhang M, Jian A. Optofluidics Refractometers. MICROMACHINES 2018; 9:E136. [PMID: 30424070 PMCID: PMC6187763 DOI: 10.3390/mi9030136] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Revised: 03/02/2018] [Accepted: 03/16/2018] [Indexed: 12/30/2022]
Abstract
Refractometry is a classic analytical method in analytical chemistry and biosensing. By integrating advanced micro- and nano-optical systems with well-developed microfluidics technology, optofluidics are shown to be a powerful, smart and universal platform for refractive index sensing applications. This paper reviews recent work on optofluidic refractometers based on different sensing mechanisms and structures (e.g., photonic crystal/photonic crystal fibers, waveguides, whisper gallery modes and surface plasmon resonance), and traces the performance enhancement due to the synergistic integration of optics and microfluidics. A brief discussion of future trends in optofluidic refractometers, namely volume sensing and resolution enhancement, are also offered.
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Affiliation(s)
- Cheng Li
- State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, No. 10, Xitucheng Road, Haidian District, Beijing 100876, China.
| | - Gang Bai
- MicroNano System Research Center, College of Information and Computer Science, Taiyuan University of Technology, Taiyuan 030024, China.
- Key Laboratory of Advanced Transducers and Intelligent Control System, Shanxi Province and Ministry of Education, Taiyuan 030024, China.
| | - Yunxiao Zhang
- MicroNano System Research Center, College of Information and Computer Science, Taiyuan University of Technology, Taiyuan 030024, China.
| | - Min Zhang
- State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, No. 10, Xitucheng Road, Haidian District, Beijing 100876, China.
| | - Aoqun Jian
- MicroNano System Research Center, College of Information and Computer Science, Taiyuan University of Technology, Taiyuan 030024, China.
- Key Laboratory of Advanced Transducers and Intelligent Control System, Shanxi Province and Ministry of Education, Taiyuan 030024, China.
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4
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Nanostructured photoelectrochemical biosensor for highly sensitive detection of organophosphorous pesticides. Biosens Bioelectron 2014; 64:1-5. [PMID: 25173731 DOI: 10.1016/j.bios.2014.08.006] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2014] [Revised: 07/27/2014] [Accepted: 08/03/2014] [Indexed: 11/21/2022]
Abstract
A sensitive photoelectrochemical (PEC) biosensor for detection of organophosphorus pesticides (OPs) using the nanocomposite of CdSe@ZnS quantum dots (QDs) and graphene deposited on the ITO coated glass electrode as a photoactive electrode is presented. The integration of CdSe@ZnS/graphene nanocomposite with biomolecules acetylcholinesterase (AChE) as a biorecognition element yields a novel biosensing platform. Under visible light irradiation, the AChE-CdSe@ZnS/graphene nanocomposite can generate a stable photocurrent and the photocurrent is found to be inversely dependent on the concentration of OPs. Under the optimal experimental conditions, the photocurrents were proportional to the logarithm of paraoxon and dichlorvos within the concentration range of 10(-12)-10(-6) M. The detection limits (LOD) of the proposed biosensor for paraoxon and dichlorvos are as low as 10(-14) M and 10(-12) M. The photoelectrochemical biosensor shows good sensitivity, reproducibility, stability, and could be successfully applied to detection of OPs in real fruit samples.
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Ivanov Y, Marinov I, Portaccio M, Lepore M, Mita DG, Godjevargova T. Flow-Injection System with Site-Specific Immobilization of Acetylcholinesterase Biosensor for Amperometric Detection of Organophosphate Pesticides. BIOTECHNOL BIOTEC EQ 2014. [DOI: 10.5504/bbeq.2012.0033] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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6
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Signal-on electrochemiluminescence of biofunctional CdTe quantum dots for biosensing of organophosphate pesticides. Biosens Bioelectron 2014; 53:363-9. [DOI: 10.1016/j.bios.2013.10.011] [Citation(s) in RCA: 86] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2013] [Revised: 10/07/2013] [Accepted: 10/07/2013] [Indexed: 11/22/2022]
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7
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Kanaujia PK, Bhatnagar MC, Prakash GV. Effect of volatile solvent infiltration on optical and electrical characteristics of porous photonic structures. RSC Adv 2014. [DOI: 10.1039/c3ra46515b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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8
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Porous silicon biosensor: Current status. Biosens Bioelectron 2013; 41:54-64. [DOI: 10.1016/j.bios.2012.09.045] [Citation(s) in RCA: 151] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2012] [Revised: 09/13/2012] [Accepted: 09/22/2012] [Indexed: 01/10/2023]
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9
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Zhao Y, Zhang W, Lin Y, Du D. The vital function of Fe3O4@Au nanocomposites for hydrolase biosensor design and its application in detection of methyl parathion. NANOSCALE 2013; 5:1121-1126. [PMID: 23280070 DOI: 10.1039/c2nr33107a] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
A nanocomposite of gold nanoparticles (AuNPs) decorating a magnetic Fe(3)O(4) core was synthesized using cysteamine (SH-NH(2)) as linker, and characterized by TEM, XPS, UV and electrochemistry. Then a hydrolase biosensor, based on self-assembly of methyl parathion hydrolase (MPH) on the Fe(3)O(4)@Au nanocomposite, was developed for sensitive and selective detection of the organophosphorus pesticide (OP) methyl parathion. The magnetic nanocomposite provides an easy way to construct the enzyme biosensor by simply exerting an external magnetic field, and also provides a simple way to renew the electrode surface by removing the magnet. Unlike inhibition-based enzyme biosensors, the hydrolase is not poisoned by OPs and thus is reusable for continuous measurement. AuNPs not only provide a large surface area, high loading efficiency and fast electron transfer, but also stabilize the enzyme through electrostatic interactions. The MPH biosensor shows rapid response and high selectivity for detection of methyl parathion, with a linear range from 0.5 to 1000 ng mL(-1) and a detection limit of 0.1 ng mL(-1). It also shows acceptable reproducibility and stability. The simplicity and ease of operation of the proposed method has great potential for on-site detection of P-S containing pesticides and provides a promising strategy to construct a robust biosensor.
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Affiliation(s)
- Yuting Zhao
- Key Laboratory of Pesticide and Chemical Biology of Ministry of Education, College of Chemistry, Central China Normal University, Wuhan 430079, PR China
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10
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Biosensor based on acetylcholinesterase immobilized onto layered double hydroxides for flow injection/amperometric detection of organophosphate pesticides. Biosens Bioelectron 2013; 39:320-3. [DOI: 10.1016/j.bios.2012.07.026] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2012] [Revised: 07/01/2012] [Accepted: 07/13/2012] [Indexed: 11/30/2022]
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11
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Gong J, Wang X, Li X, Wang K. Highly sensitive visible light activated photoelectrochemical biosensing of organophosphate pesticide using biofunctional crossed bismuth oxyiodide flake arrays. Biosens Bioelectron 2012; 38:43-9. [DOI: 10.1016/j.bios.2012.04.040] [Citation(s) in RCA: 86] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2012] [Revised: 04/26/2012] [Accepted: 04/27/2012] [Indexed: 11/24/2022]
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12
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Yang S, Luo S, Liu C, Wei W. Direct synthesis of graphene–chitosan composite and its application as an enzymeless methyl parathion sensor. Colloids Surf B Biointerfaces 2012; 96:75-9. [DOI: 10.1016/j.colsurfb.2012.03.007] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2011] [Revised: 02/14/2012] [Accepted: 03/13/2012] [Indexed: 11/30/2022]
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13
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Liao S, Qiao Y, Han W, Xie Z, Wu Z, Shen G, Yu R. Acetylcholinesterase Liquid Crystal Biosensor Based on Modulated Growth of Gold Nanoparticles for Amplified Detection of Acetylcholine and Inhibitor. Anal Chem 2011; 84:45-9. [DOI: 10.1021/ac202895j] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Shuzhen Liao
- State Key Laboratory for Chemo/Biosensing
and Chemometrics,
College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Yanan Qiao
- State Key Laboratory for Chemo/Biosensing
and Chemometrics,
College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Wenting Han
- State Key Laboratory for Chemo/Biosensing
and Chemometrics,
College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Zhaoxia Xie
- State Key Laboratory for Chemo/Biosensing
and Chemometrics,
College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Zhaoyang Wu
- State Key Laboratory for Chemo/Biosensing
and Chemometrics,
College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Guoli Shen
- State Key Laboratory for Chemo/Biosensing
and Chemometrics,
College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Ruqin Yu
- State Key Laboratory for Chemo/Biosensing
and Chemometrics,
College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
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14
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An enzymeless organophosphate pesticide sensor using Au nanoparticle-decorated graphene hybrid nanosheet as solid-phase extraction. Talanta 2011; 85:1344-9. [DOI: 10.1016/j.talanta.2011.06.016] [Citation(s) in RCA: 106] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2011] [Revised: 06/07/2011] [Accepted: 06/09/2011] [Indexed: 11/22/2022]
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15
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Gong J, Zhang W, Liu T, Zhang L. Facile fabrication of chitosan-calcium carbonate nanowall arrays and their use as a sensitive non-enzymatic organophosphate pesticide sensor. NANOSCALE 2011; 3:3123-3131. [PMID: 21674113 DOI: 10.1039/c1nr10286a] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Novel nanowall arrays of CaCO(3)-chitosan (CaCO(3)-chi) were deposited onto a cathodic substrate by a facile one-step electrodeposition approach. Results demonstrate that chitosan plays an important role in the formation of nanowall arrays. Freestanding well-aligned CaCO(3)-chi nanowall arrays were observed to be uniformly distributed over the whole substrate with a lateral dimension in the micrometre size and an average pore size of ∼400 nm. The as-formed CaCO(3)-chi nanowall arrays featuring interlaced porous network architecture, large surface area, and open boundaries, are highly efficient in the capture of organophosphate pesticides (OPs). Combined with stripping voltammetry, a highly sensitive non-enzymatic OPs sensor was fabricated using the prepared CaCO(3)-chi nanowall arrays for solid phase extraction (SPE). The detection limit for methyl parathion (MP) in aqueous solutions was determined to be 0.8 ng mL(-1) (S/N = 3). The resulting sensor made of novel CaCO(3)-chi nanowall arrays exhibits good reproducibility and acceptable stability. This work not only provides a facile and effective route for the preparation of CaCO(3)-chi nanowall arrays, but also offers a new promising protocol for OPs analysis.
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Affiliation(s)
- Jingming Gong
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, College of Chemistry, Central China Normal University, Wuhan, 430079, China.
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16
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Gong J, Wang L, Miao X, Zhang L. Efficient stripping voltammetric detection of organophosphate pesticides using NanoPt intercalated Ni/Al layered double hydroxides as solid-phase extraction. Electrochem commun 2010. [DOI: 10.1016/j.elecom.2010.09.021] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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17
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Li Y, Gan Z, Li Y, Liu Q, Bao J, Dai Z, Han M. Immobilization of acetylcholinesterase on one-dimensional gold nanoparticles for detection of organophosphorous insecticides. Sci China Chem 2010. [DOI: 10.1007/s11426-010-0105-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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18
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Amperometric acetylthiocholine sensor based on acetylcholinesterase immobilized on nanostructured polymer membrane containing gold nanoparticles. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.molcatb.2009.09.005] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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19
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Stripping voltammetric analysis of organophosphate pesticides using Ni/Al layered double hydroxides as solid-phase extraction. Biosens Bioelectron 2009; 25:493-6. [DOI: 10.1016/j.bios.2009.07.008] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2009] [Revised: 06/27/2009] [Accepted: 07/10/2009] [Indexed: 11/24/2022]
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20
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Gong J, Wang L, Zhang L. Electrochemical biosensing of methyl parathion pesticide based on acetylcholinesterase immobilized onto Au–polypyrrole interlaced network-like nanocomposite. Biosens Bioelectron 2009; 24:2285-8. [DOI: 10.1016/j.bios.2008.11.012] [Citation(s) in RCA: 129] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2008] [Revised: 11/08/2008] [Accepted: 11/11/2008] [Indexed: 11/26/2022]
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21
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Du D, Chen S, Cai J, Zhang A. Immobilization of acetylcholinesterase on gold nanoparticles embedded in sol–gel film for amperometric detection of organophosphorous insecticide. Biosens Bioelectron 2007; 23:130-4. [PMID: 17499494 DOI: 10.1016/j.bios.2007.03.008] [Citation(s) in RCA: 103] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2006] [Revised: 01/12/2007] [Accepted: 03/19/2007] [Indexed: 10/23/2022]
Abstract
A simple method to immobilize acetylcholinesterase (AChE) on silica sol-gel (SiSG) film assembling gold nanoparticles (AuNPs) was proposed, thus a sensitive, fast and stable amperometric sensor for quantitative determination of organophosphorous insecticide was developed. The large quantities of hydroxyl groups in the sol-gel composite provided a biocompatible microenvironment around enzyme molecule and stabilized its biological activity to a large extent. The immobilized AChE could catalyze the hydrolysis of acetylthiocholine chloride (ATCl) with a Kmapp value of 450 microM to form thiocholine, which was then oxidized to produce detectable single with a linear range of 10-1000 microM. AuNPs catalyzed the electro-oxidation of thiocholine, thus increasing detection sensitivity. Based on the inhibition of organophosphorous insecticide on the enzymatic activity of AChE, using monocrotophos as a model compound, the conditions for detection of the insecticide were optimized. The inhibition of monocrotophos was proportional to its concentration ranging from 0.001 to 1 microg/ml and 2 to 15 microg/ml, with the correlation coefficients of 0.9930 and 0.9985, respectively. The detection limit was 0.6 ng/ml at a 10% inhibition. The developed biosensor exhibited good reproducibility and acceptable stability, thus providing a new promising tool for analysis of enzyme inhibitors.
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Affiliation(s)
- Dan Du
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Central China Normal University, Wuhan 430079, PR China.
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22
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Knapton D, Burnworth M, Rowan SJ, Weder C. Fluorescent Organometallic Sensors for the Detection of Chemical-Warfare-Agent Mimics. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200601634] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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23
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Knapton D, Burnworth M, Rowan SJ, Weder C. Fluorescent Organometallic Sensors for the Detection of Chemical-Warfare-Agent Mimics. Angew Chem Int Ed Engl 2006; 45:5825-9. [PMID: 16874825 DOI: 10.1002/anie.200601634] [Citation(s) in RCA: 182] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Daniel Knapton
- Department of Macromolecular Science and Engineering, Case Western Reserve University, 2100 Adelbert Road, Cleveland, OH 44106-7202, USA
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