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Aghoutane Y, Diouf A, Österlund L, Bouchikhi B, El Bari N. Development of a molecularly imprinted polymer electrochemical sensor and its application for sensitive detection and determination of malathion in olive fruits and oils. Bioelectrochemistry 2019; 132:107404. [PMID: 31911357 DOI: 10.1016/j.bioelechem.2019.107404] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Revised: 10/04/2019] [Accepted: 10/04/2019] [Indexed: 12/15/2022]
Abstract
Malathion (MAL) is an organophosphorus (OP) insecticide. It is a cholinesterase inhibitor, which can pose serious health and environmental problems. In this study, a sensitive and selective molecular imprinted polymer (MIP) based on screen-printed gold electrodes (Au-SPE) for MAL detection in olive oils and fruits, was devised. The MIP sensor was prepared using acrylamide as the functional monomer and MAL as the template. Subsequently, the morphology of the electrode surface was studied by scanning electron microscopy (SEM) and atomic force microscopy (AFM). The electrochemical characterization of the developed MIP sensor was performed by cyclic voltammetry (CV), differential pulse voltammetry (DPV), and electrochemical impedance spectroscopy (EIS) techniques. The operational repeatability and stability of the sensor were studied. It was found to have a dynamic concentration range of (0.1 pg mL-1-1000 pg mL-1) and a low limit of detection (LOD) of 0.06 pg mL-1. Furthermore, the sensor was employed to determine MAL content in olive oil with a recovery rate of 87.9% and a relative standard deviation of 8%. It was successfully applied for MAL determination in real samples and promise to open new opportunities for the detection of OP pesticides residues in various food products, as well as in environmental applications.
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Affiliation(s)
- Youssra Aghoutane
- Biotechnology Agroalimentary and Biomedical Analysis Group, Department of Biology, Faculty of Sciences, Moulay Ismaïl University, B.P. 11201, Zitoune, Meknes, Morocco; Sensor Electronic & Instrumentation Group, Department of Physics, Faculty of Sciences, Moulay Ismaïl University, B.P. 11201, Zitoune, Meknes, Morocco
| | - Alassane Diouf
- Biotechnology Agroalimentary and Biomedical Analysis Group, Department of Biology, Faculty of Sciences, Moulay Ismaïl University, B.P. 11201, Zitoune, Meknes, Morocco; Sensor Electronic & Instrumentation Group, Department of Physics, Faculty of Sciences, Moulay Ismaïl University, B.P. 11201, Zitoune, Meknes, Morocco
| | - Lars Österlund
- Dept. Engineering Sciences, The Ångström Laboratory, Uppsala University, P. O. Box 534, SE-75121 Uppsala, Sweden
| | - Benachir Bouchikhi
- Sensor Electronic & Instrumentation Group, Department of Physics, Faculty of Sciences, Moulay Ismaïl University, B.P. 11201, Zitoune, Meknes, Morocco
| | - Nezha El Bari
- Biotechnology Agroalimentary and Biomedical Analysis Group, Department of Biology, Faculty of Sciences, Moulay Ismaïl University, B.P. 11201, Zitoune, Meknes, Morocco.
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Molecular recognition moiety and its target biomolecule interact in switching enzyme activity. J Biosci Bioeng 2013; 115:639-44. [DOI: 10.1016/j.jbiosc.2012.12.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2012] [Revised: 12/25/2012] [Accepted: 12/26/2012] [Indexed: 01/02/2023]
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Rau S, Gauglitz G. Reflectometric interference spectroscopy (RIfS) as a new tool to measure in the complex matrix milk at low analyte concentration. Anal Bioanal Chem 2011; 402:529-36. [PMID: 22009049 DOI: 10.1007/s00216-011-5470-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2011] [Revised: 09/27/2011] [Accepted: 10/03/2011] [Indexed: 10/16/2022]
Abstract
Measurements in complex matrices like milk still present a challenge in biosensor development. This is especially important when using a label-free detection method or when measuring low analyte concentrations. The direct optical method reflectometric interference spectroscopy (RIfS) was used for investigating matrix effects in immunoassay development. Furthermore, approaches to reduce these effects have been established. As a model system, the hormone testosterone has been chosen because this immunoassay has been well characterized in buffer. In a first step, the immunoassay for the detection of testosterone in buffer was improved beyond former published results. Therefore, the sensor surface was optimized, resulting in a fivefold lower limit of detection (70.2 ng L(-1)) and limit of quantification (130.0 ng L(-1)). Additionally, the assay time could be reduced to 15 min. Consequently, we used this improved assay to investigate matrix effects of whole pasteurized bovine milk. To minimize these effects, the surface chemistry was adapted and a suitable evaluation method was established, reducing the effects of Tyndall scattering and nonspecific binding to the sensor surface. These improvements allow for very reliable quantitative measurements in milk. The assay developed required no sample pretreatment and allowed for the regeneration of the sensor surface so that calibration could be performed on one chip. The calibration in milk (3.5% fat) resulted in a limit of detection of 94.4 ng L(-1) and a limit of quantification of 229.3 ng L(-1). Furthermore, recovery rates between 70% and 120% could be obtained. Thus, for the first time, an analyte in the matrix milk was successfully quantified with RIfS at low concentrations.
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Affiliation(s)
- Sabrina Rau
- Institute of Physical and Theoretical Chemistry (IPTC), Eberhard Karls University of Tübingen, Tübingen, Germany.
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Majer-Baranyi K, Székács A, Szendrő I, Kiss A, Adányi N. Optical waveguide lightmode spectroscopy technique–based immunosensor development for deoxynivalenol determination in wheat samples. Eur Food Res Technol 2011. [DOI: 10.1007/s00217-011-1598-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Németh E, Adányi N, Halász A, Váradi M, Szendrő I. Real-time study of the effect of different stress factors on lactic acid bacteria by electrochemical optical waveguide lightmode spectroscopy. ACTA ACUST UNITED AC 2007; 24:631-7. [DOI: 10.1016/j.bioeng.2007.10.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2007] [Revised: 09/29/2007] [Accepted: 10/15/2007] [Indexed: 11/30/2022]
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Salmain M, Fischer-Durand N, Pradier CM. Infrared optical immunosensor: application to the measurement of the herbicide atrazine. Anal Biochem 2007; 373:61-70. [PMID: 18022375 DOI: 10.1016/j.ab.2007.10.031] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2007] [Revised: 10/22/2007] [Accepted: 10/24/2007] [Indexed: 11/26/2022]
Abstract
A new approach to optically transduce antigen-antibody association, needing no label, is described herein, taking advantage of the ability of reflection-absorption infrared (IR) spectroscopy to analyze organic thin films at the surface of reflective materials with high sensitivity. As a proof-of-principle, this new technique was applied to the immunodetection of the herbicide atrazine. Gold-coated chips were covered with a capture layer consisting of a protein derivative of the herbicide atrazine covalently bound to a self-assembled monolayer containing a carboxy-terminated thiolate. Successive binding of anti-atrazine antibody and secondary anti-rabbit immunoglobulin G antibody resulted in a change of the IR absorption properties of the organic film at the sensor surface. The two prominent amide I and II bands observed on the surface IR spectra were taken for semiquantitative analysis of the adsorbed protein amount. The presence of increasing amounts of atrazine resulted in the progressive inhibition of antibodies binding to the sensors, yielding a relative lower increase of the IR signals. The deduced standard curves displayed a sigmoidal shape typical of competitive inhibition assays. The test midpoint (IC(50)) and the limit of detection (IC(80)) were found to be in the nanomolar range and very close to those measured by an in-house enzyme-linked immunosorbent assay using the same antibody and the same antigen competitor.
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Affiliation(s)
- Michèle Salmain
- Ecole Nationale Supérieure de Chimie de Paris, Laboratoire de chimie et biochimie des complexes moléculaires (UMR CNRS 7576), 75231 Paris cedex 05, France.
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Strategies for label-free optical detection. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2007; 109:395-432. [PMID: 17999039 DOI: 10.1007/10_2007_076] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A large number of methods using direct detection with label-free systems are known. They compete with the well-introduced fluorescence-based methods. However, recent applications take advantage of label-free detection in protein-protein interactions, high-throughput screening, and high-content screening. These new applications require new strategies for biosensors. It becomes more and more obvious that neither the transduction principle nor the recognition elements for the biomolecular interaction process alone determine the quality of the biosensor. Accordingly, the biosensor system has to be considered as a whole. This chapter focuses on strategies to optimize the detection platform and the biomolecular recognition layer. It concentrates on direct detection methods, with special focus on optical transduction. Since even this restriction still leaves a large number of methods, only microrefractometric and microreflectometric methods using planar transducers have been selected for a detailed description and a listing of applications. However, since many review articles on the physical principles exist, the description is kept short. Other methods are just mentioned in brief and for comparison. The outlook and the applications demonstrate the future perspectives of direct optical detection in bioanalytics.
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Adányi N, Levkovets IA, Rodriguez-Gil S, Ronald A, Váradi M, Szendro I. Development of immunosensor based on OWLS technique for determining Aflatoxin B1 and Ochratoxin A. Biosens Bioelectron 2006; 22:797-802. [PMID: 16600588 DOI: 10.1016/j.bios.2006.02.015] [Citation(s) in RCA: 88] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2005] [Revised: 02/15/2006] [Accepted: 02/20/2006] [Indexed: 10/24/2022]
Abstract
Mycotoxins are toxic secondary metabolites produced by a number of different fungi, and can be present in a wide range of food and feed commodities including cereal grains, oil seeds, dried fruits, apple juice, wine and meat products from animals fed contaminated meal. Many mycotoxins are highly resistant, and survive food processing, and therefore enter the food chain and provide a threat to human health. The optical waveguide lightmode spectroscopy (OWLS) technique has been applied to the detection of Aflatoxin and Ochratoxin in both competitive and in direct immunoassays. After immobilizing the antibody or antigen conjugate for the direct or indirect measurement, respectively, the sensor chip was used in flow-injection analyser (FIA) system. When using non-competitive method, sensor responses were obtained first only at analyte concentrations of 5-10 ng ml(-1). In both cases, the responses were very unstable. For competitive sensor investigation with the sensitized chip first the optimal dilution rate of monoclonal antibodies was determined, for the measurement of Ochratoxin A and Aflatoxin B1 the monoclonal antibody stock solution was diluted to 1 microg ml(-1) and to a 1:400 dilution, respectively. During the competitive measurement standard solutions were mixed with monoclonal antibodies at the appropriate concentration, the mixture was incubated for 1 min and injected into the OWLS system. The sensitive detection range of the competitive detection method was between 0.5 and 10 ng ml(-1) in both cases. After the establishment of the indirect method, barley and wheat flour samples were measured, and the results were in good correlation by those measured by enzyme linked immuno-sorbent assay (ELISA). Regression coefficient between the two methods for Ochratoxin and Aflatoxin was determined as 0.96 and 0.89, respectively.
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Affiliation(s)
- N Adányi
- Central Food Research Institute, Herman Ottó út 15, Budapest H-1022, Hungary.
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Székács A, Trummer N, Adányi N, Váradi M, Szendrő I. Development of a non-labeled immunosensor for the herbicide trifluralin via optical waveguide lightmode spectroscopic detection. Anal Chim Acta 2003. [DOI: 10.1016/s0003-2670(03)00302-7] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Piehler J, Brecht A, Valiokas R, Liedberg B, Gauglitz G. A high-density poly(ethylene glycol) polymer brush for immobilization on glass-type surfaces. Biosens Bioelectron 2001; 15:473-81. [PMID: 11419642 DOI: 10.1016/s0956-5663(00)00104-4] [Citation(s) in RCA: 202] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Label-free heterogeneous phase detection critically depends on the properties of the interfacial layer. We have obtained high-density monomolecular poly(ethylene glycol) (PEG) layers by solvent-free coupling of homo-bifunctional PEGs (2,000 g/mol) at 75 degrees C to silica surfaces silanized with glycidyloxipropyltrimethoxysilane (GOPTS). Characterization by ellipsometry and contact angles revealed that PEG layers up to 3.4 ng/mm2 with low roughness and flexibility were obtained. Specific and non-specific binding at these PEG surfaces was monitored by reflectometric interference spectroscopy (RIfS). No significant non-specific adsorption upon incubation of 1 mg/ml ovalbumin was detectable (< 10 pg/mm2), and 150 pg/mm2 upon incubation of 10% calf serum, less than 10% of the amount adsorbed to the solely silanized surfaces. The terminal functional groups of the PEG layers were utilized to couple ligands and a protein. Specific protein interaction with these immobilized compounds was detected with saturation loadings in the range of protein monolayers (2-4 ng/mm2). The excellent functional properties, the high stability of the layers, the generic and practical coupling procedure and the versatility for immobilizing compounds of very different functionality make these PEG layers very attractive for application in label-free detection with silica or metal-oxide based transducers.
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Affiliation(s)
- J Piehler
- Institut für Physikalische Chemie, Tübingen, Germany.
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MEHRVAR M, BIS C, SCHARER JM, YOUNG MM, LUONG JH. Fiber-Optic Biosensors. Trends and Advances. ANAL SCI 2000. [DOI: 10.2116/analsci.16.677] [Citation(s) in RCA: 96] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Mehrab MEHRVAR
- School of Chemical Engineering, Ryerson Polytechnic University
| | - Chris BIS
- School of Chemical Engineering, Ryerson Polytechnic University
| | | | | | - John H. LUONG
- Biotechnology Research Institute, National Research Council of Canada
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Weisser M, Käshammer J, Menges B, Matsumoto J, Nakamura F, Ijiro K, Shimomura M, Mittler S. Adenine−Uridine Base Pairing at the Water−Solid-Interface. J Am Chem Soc 1999. [DOI: 10.1021/ja990447b] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Michael Weisser
- Contribution from the Max-Planck-Institut für Polymerforschung, Ackermann Weg 10, 55128 Mainz, Germany, and Research Institute for Electronic Science, Hokkaido University, N12W6, Sapporo 060, Japan
| | - Josua Käshammer
- Contribution from the Max-Planck-Institut für Polymerforschung, Ackermann Weg 10, 55128 Mainz, Germany, and Research Institute for Electronic Science, Hokkaido University, N12W6, Sapporo 060, Japan
| | - Bernhard Menges
- Contribution from the Max-Planck-Institut für Polymerforschung, Ackermann Weg 10, 55128 Mainz, Germany, and Research Institute for Electronic Science, Hokkaido University, N12W6, Sapporo 060, Japan
| | - Jin Matsumoto
- Contribution from the Max-Planck-Institut für Polymerforschung, Ackermann Weg 10, 55128 Mainz, Germany, and Research Institute for Electronic Science, Hokkaido University, N12W6, Sapporo 060, Japan
| | - Fumio Nakamura
- Contribution from the Max-Planck-Institut für Polymerforschung, Ackermann Weg 10, 55128 Mainz, Germany, and Research Institute for Electronic Science, Hokkaido University, N12W6, Sapporo 060, Japan
| | - Kuniharu Ijiro
- Contribution from the Max-Planck-Institut für Polymerforschung, Ackermann Weg 10, 55128 Mainz, Germany, and Research Institute for Electronic Science, Hokkaido University, N12W6, Sapporo 060, Japan
| | - Masatsugu Shimomura
- Contribution from the Max-Planck-Institut für Polymerforschung, Ackermann Weg 10, 55128 Mainz, Germany, and Research Institute for Electronic Science, Hokkaido University, N12W6, Sapporo 060, Japan
| | - Silvia Mittler
- Contribution from the Max-Planck-Institut für Polymerforschung, Ackermann Weg 10, 55128 Mainz, Germany, and Research Institute for Electronic Science, Hokkaido University, N12W6, Sapporo 060, Japan
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Obando LA, Booksh KS. Tuning Dynamic Range and Sensitivity of White-Light, Multimode, Fiber-Optic Surface Plasmon Resonance Sensors. Anal Chem 1999. [DOI: 10.1021/ac990470f] [Citation(s) in RCA: 83] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Louis A. Obando
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287
| | - Karl S. Booksh
- Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287
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Weller MG, Schuetz AJ, Winklmair M, Niessner R. Highly parallel affinity sensor for the detection of environmental contaminants in water1Parts of this work were presented at the Fifth World Congress on Biosensors, Berlin, Germany, 1998.1. Anal Chim Acta 1999. [DOI: 10.1016/s0003-2670(98)00855-1] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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