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Jabbari S, Dabirmanesh B, Daneshjou S, Khajeh K. The potential of a novel enzyme-based surface plasmon resonance biosensor for direct detection of dopamine. Sci Rep 2024; 14:14303. [PMID: 38906902 PMCID: PMC11192927 DOI: 10.1038/s41598-024-64796-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Accepted: 06/13/2024] [Indexed: 06/23/2024] Open
Abstract
Dopamine is one of the significant neurotransmitters and its monitoring in biological fluids is a critical issue in healthcare and modern biomedical technology. Here, we have developed a dopamine biosensor based on surface plasmon resonance (SPR). For this purpose, the carboxymethyl dextran SPR chip was used as a surface to immobilize laccase as a bioaffinity recognition element. Data analysis exhibited that the acidic pH value is the optimal condition for dopamine interaction. Calculated kinetic affinity (KD) (48,545 nM), obtained from a molecular docking study, showed strong association of dopamine with the active site of laccase. The biosensor exhibited a linearity from 0.01 to 189 μg/ml and a lower detection limit of 0.1 ng/ml (signal-to-noise ratio (S/N) = 3) that is significantly higher than the most direct dopamine detecting sensors reported so far. Experiments for specificity in the presence of compounds that can co-exist with dopamine detection such as ascorbic acid, urea and L-dopa showed no significant interference. The current dopamine biosensor with high sensitivity and specificity, represent a novel detection tool that offers a label-free, simple procedure and cost effective monitoring system.
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Affiliation(s)
- Safoura Jabbari
- Department of Biochemistry and Biophysics, Faculty of Advanced Sciences and Technology, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran
| | - Bahareh Dabirmanesh
- Department of Biochemistry, Faculty of Biological Science, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran
| | - Sara Daneshjou
- Department of Nanobiotechnology, Faculty of Biological Science, Tarbiat Modares University, Tehran, Iran
| | - Khosro Khajeh
- Department of Biochemistry, Faculty of Biological Science, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran.
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Mathematical Modelling of Biosensing Platforms Applied for Environmental Monitoring. CHEMOSENSORS 2021. [DOI: 10.3390/chemosensors9030050] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
In recent years, mathematical modelling has known an overwhelming integration in different scientific fields. In general, modelling is used to obtain new insights and achieve more quantitative and qualitative information about systems by programming language, manipulating matrices, creating algorithms and tracing functions and data. Researchers have been inspired by these techniques to explore several methods to solve many problems with high precision. In this direction, simulation and modelling have been employed for the development of sensitive and selective detection tools in different fields including environmental control. Emerging pollutants such as pesticides, heavy metals and pharmaceuticals are contaminating water resources, thus threatening wildlife. As a consequence, various biosensors using modelling have been reported in the literature for efficient environmental monitoring. In this review paper, the recent biosensors inspired by modelling and applied for environmental monitoring will be overviewed. Moreover, the level of success and the analytical performances of each modelling-biosensor will be discussed. Finally, current challenges in this field will be highlighted.
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A kinetic model for amperometric immobilized enzymes at planar, cylindrical and spherical electrodes: The Akbari-Ganji method. J Electroanal Chem (Lausanne) 2021. [DOI: 10.1016/j.jelechem.2020.114921] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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4
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Chrouda A, Zinoubi K, Soltane R, Alzahrani N, Osman G, Al-Ghamdi YO, Qari S, Al Mahri A, Algethami FK, Majdoub H, Jaffrezic Renault N. An Acetylcholinesterase Inhibition-Based Biosensor for Aflatoxin B 1 Detection Using Sodium Alginate as an Immobilization Matrix. Toxins (Basel) 2020; 12:E173. [PMID: 32168976 PMCID: PMC7150741 DOI: 10.3390/toxins12030173] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2020] [Revised: 03/02/2020] [Accepted: 03/05/2020] [Indexed: 01/08/2023] Open
Abstract
In this study, we investigated a novel aflatoxin biosensor based on acetylcholinesterase (AChE) inhibition by aflatoxin B1 (AFB1) and developed electrochemical biosensors based on a sodium alginate biopolymer as a new matrix for acetylcholinesterase immobilization. Electrochemical impedance spectroscopy was performed as a convenient transduction method to evaluate the AChE activity through the oxidation of the metabolic product, thiocholine. Satisfactory analytical performances in terms of high sensitivity, good repeatability, and long-term storage stability were obtained with a linear dynamic range from 0.1 to 100 ng/mL and a low detection limit of 0.1 ng/mL, which is below the recommended level of AFB1 (2 µg/L). The suitability of the proposed method was evaluated using the samples of rice supplemented with AFB1 (0.5 ng/mL). The selectivity of the AChE-biosensor for aflatoxins relative to other sets of toxic substances (OTA, AFM 1) was also investigated.
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Affiliation(s)
- Amani Chrouda
- Department of Chemistry, College of Science Al-Zulfi, Majmaah University, Al-Majmaah 11952, Saudi Arabia; (A.C.); (Y.O.A.-G.)
- Laboratory of Interfaces and Advanced Materials, Faculty of Sciences, Monastir University, Monastir 5000, Tunisia; (K.Z.); (H.M.)
- Institute of Analytical Sciences, UMR CNRS-UCBL-ENS 5280, 5 Rue la Doua, 69100 Villeurbanne, CEDEX, France;
| | - Khouala Zinoubi
- Laboratory of Interfaces and Advanced Materials, Faculty of Sciences, Monastir University, Monastir 5000, Tunisia; (K.Z.); (H.M.)
| | - Raya Soltane
- Faculty of Sciences of Tunis, Tunis El Manar University, El Manar, Tunis 1068, Tunis;
- Department of Basic Sciences, Adham University College, Umm Al-Qura University, Adham 21971, Saudi Arabia;
| | - Noof Alzahrani
- Department of Basic Sciences, Adham University College, Umm Al-Qura University, Adham 21971, Saudi Arabia;
| | - Gamal Osman
- Department of Biology, Faculty of Applied Sciences, Umm Al-Qura University, Makkah 21955, Saudi Arabia
- Research Laboratories Center, Faculty of Applied Science, Umm Al-Qura University, Mecca 21955, Saudi Arabia
- Agricultural Genetic Engineering Research Institute (AGERI), ARC, Giza 12915, Egypt
| | - Youssef O. Al-Ghamdi
- Department of Chemistry, College of Science Al-Zulfi, Majmaah University, Al-Majmaah 11952, Saudi Arabia; (A.C.); (Y.O.A.-G.)
| | - Sameer Qari
- Department of Biology, Aljumum University College, Umm Al-Qura University, Makkah Aljumum 21955, Saudi Arabia;
| | - Albandary Al Mahri
- Department of Biology, Faculty of Sciences and Arts, King Khalid University, Dhahran Aljanoub 61421, Saudi Arabia;
| | - Faisal K. Algethami
- Department of Chemistry, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh 11432, Saudi Arabia;
| | - Hatem Majdoub
- Laboratory of Interfaces and Advanced Materials, Faculty of Sciences, Monastir University, Monastir 5000, Tunisia; (K.Z.); (H.M.)
| | - Nicole Jaffrezic Renault
- Institute of Analytical Sciences, UMR CNRS-UCBL-ENS 5280, 5 Rue la Doua, 69100 Villeurbanne, CEDEX, France;
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Nanomaterials and new biorecognition molecules based surface plasmon resonance biosensors for mycotoxin detection. Biosens Bioelectron 2019; 143:111603. [DOI: 10.1016/j.bios.2019.111603] [Citation(s) in RCA: 68] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Revised: 08/06/2019] [Accepted: 08/14/2019] [Indexed: 02/04/2023]
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Molecular Modeling Studies on the Interactions of Aflatoxin B1 and Its Metabolites with Human Acetylcholinesterase. Part II: Interactions with the Catalytic Anionic Site (CAS). Toxins (Basel) 2018; 10:toxins10100389. [PMID: 30257474 PMCID: PMC6215247 DOI: 10.3390/toxins10100389] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2018] [Revised: 09/13/2018] [Accepted: 09/20/2018] [Indexed: 11/16/2022] Open
Abstract
The most common type of aflatoxin (AFT) found in nature is aflatoxin B1 (AFB1). This micotoxin is extremely hepatotoxic and carcinogenic to mammals, with acute and chronic effects. It is believed that this could be related to the capacity of AFB1 and its metabolites in inhibiting the enzyme acetylcholinesterase (AChE). In a previous work, we performed an inedited theoretical investigation on the binding modes of these molecules on the peripheral anionic site (PAS) of human AChE (HssAChE), revealing that the metabolites can also bind in the PAS in the same way as AFB1. Here, we investigated the binding modes of these compounds on the catalytic anionic site (CAS) of HssAChE to compare the affinity of the metabolites for both binding sites as well as verify which is the preferential one. Our results corroborated with experimental studies pointing to AFB1 and its metabolites as mixed-type inhibitors, and pointed to the residues relevant for the stabilization of these compounds on the CAS of HssAChE.
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Detection of AFB1 via TiO2 Nanotubes/Au Nanoparticles/Enzyme Photoelectrochemical Biosensor. COATINGS 2018. [DOI: 10.3390/coatings8030090] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Aflatoxins produced by Aspergillus parasiticus present in the diet of quails increase the activities of cholinesterase and adenosine deaminase. Microb Pathog 2017; 107:309-312. [DOI: 10.1016/j.micpath.2017.03.041] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Revised: 03/30/2017] [Accepted: 03/30/2017] [Indexed: 12/12/2022]
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Linardaki ZI, Lamari FN, Margarity M. Saffron (Crocus sativus L.) Tea Intake Prevents Learning/Memory Defects and Neurobiochemical Alterations Induced by Aflatoxin B1 Exposure in Adult Mice. Neurochem Res 2017; 42:2743-2754. [DOI: 10.1007/s11064-017-2283-z] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2017] [Revised: 03/29/2017] [Accepted: 04/22/2017] [Indexed: 01/03/2023]
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10
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Stojan J. Conformational rigidity of cholinesterases allows for the prediction of combined effects in a particular double mutant. Chem Biol Interact 2016; 259:110-114. [PMID: 27174135 DOI: 10.1016/j.cbi.2016.04.037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2016] [Revised: 04/03/2016] [Accepted: 04/27/2016] [Indexed: 10/21/2022]
Abstract
The conformational rigidity of Drosophila melanogaster AChE, was checked by kinetic means on recombinant enzyme with the substitutions of two important amino acids, one at the catalytic anionic site (W83A), one at the peripheral anionic site (W321A) and the double mutant with both tryptophans substituted by alanines (W83A/W321A). It was hypothesized that the individual mutations would affect only the binding affinities of substrate molecules at each site and that a predictable effect would show up in the corresponding double mutant. Simple inspection revealed that bell shaped curves of activity at wide substrate concentration range in the catalytic anionic site mutants carry much less information than the analogous asymmetric ones of the wild type and peripheral anionic site mutant. Therefore, a concurrent kinetic analysis of the curves for all four enzymes was undertaken by constraining mutation independent parameters: unchanged affinity at the catalytic/peripheral anionic site of the opposite mutant in comparison to the parameters for wild type enzyme. Additionally, the parameters for W83A mutated enzyme were employed for the characterization of double mutant (W83A/W321A) protein by setting the dissociation constant for the substrate at the peripheral anionic site as determined for W321A mutant. Simultaneous analysis exactly reproduced the behavior of the double mutant without any significant change of previously reported values for the wild type enzyme (Stojan et al., 2004). This kinetic behavior is completely in line with the crystallographic evidence of structural rigidity in cholinesterases.
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Affiliation(s)
- Jure Stojan
- Institute of Biochemistry, Faculty of Medicine, University of Ljublajna, Vrazov trg 2, Ljubljana, Slovenia.
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11
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Affiliation(s)
- Šárka Štěpánková
- Faculty of Chemical Technology, Department of Biological and Biochemical Sciences, University of Pardubice, Pardubice, Czech Republic
| | - Katarína Vorčáková
- Faculty of Chemical Technology, Department of Biological and Biochemical Sciences, University of Pardubice, Pardubice, Czech Republic
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Bazin I, Tria SA, Hayat A, Marty JL. New biorecognition molecules in biosensors for the detection of toxins. Biosens Bioelectron 2016; 87:285-298. [PMID: 27568847 DOI: 10.1016/j.bios.2016.06.083] [Citation(s) in RCA: 105] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Revised: 06/17/2016] [Accepted: 06/28/2016] [Indexed: 12/24/2022]
Abstract
Biological and synthetic recognition elements are at the heart of the majority of modern bioreceptor assays. Traditionally, enzymes and antibodies have been integrated in the biosensor designs as a popular choice for the detection of toxin molecules. But since 1970s, alternative biological and synthetic binders have been emerged as a promising alternative to conventional biorecognition elements in detection systems for laboratory and field-based applications. Recent research has witnessed immense interest in the use of recombinant enzymatic methodologies and nanozymes to circumvent the drawbacks associated with natural enzymes. In the area of antibody production, technologies based on the modification of in vivo synthesized materials and in vitro approaches with development of "display "systems have been introduced in the recent years. Subsequently, molecularly-imprinted polymers and Peptide nucleic acid (PNAs) were developed as an attractive receptor with applications in the area of sample preparation and detection systems. In this article, we discuss all alternatives to conventional biomolecules employed in the detection of various toxin molecules We review recent developments in modified enzymes, nanozymes, nanobodies, aptamers, peptides, protein scaffolds and DNazymes. With the advent of nanostructures and new interface materials, these recognition elements will be major players in future biosensor development.
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Affiliation(s)
- Ingrid Bazin
- École des Mines d'Alès, 6 Avenuede Clavières, 30100 Alès Cedex, France.
| | - Scherrine A Tria
- École des Mines d'Alès, 6 Avenuede Clavières, 30100 Alès Cedex, France
| | - Akhtar Hayat
- BAE (Biocapteurs-Analyses-Environnement), Universite de Perpignan Via Domitia, 52 Avenue Paul Alduy, Perpignan Cedex 66860, France; Interdisciplinary Research Centre in Biomedical Materials (IRCBM), COMSATS Institute of Information Technology (CIIT), Lahore, Pakistan
| | - Jean-Louis Marty
- BAE (Biocapteurs-Analyses-Environnement), Universite de Perpignan Via Domitia, 52 Avenue Paul Alduy, Perpignan Cedex 66860, France
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Arduini F, Neagu D, Pagliarini V, Scognamiglio V, Leonardis M, Gatto E, Amine A, Palleschi G, Moscone D. Rapid and label-free detection of ochratoxin A and aflatoxin B1 using an optical portable instrument. Talanta 2016; 150:440-8. [DOI: 10.1016/j.talanta.2015.12.048] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Revised: 12/09/2015] [Accepted: 12/14/2015] [Indexed: 11/17/2022]
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Stepurska K, Soldatkin О, Kucherenko I, Arkhypova V, Dzyadevych S, Soldatkin A. Feasibility of application of conductometric biosensor based on acetylcholinesterase for the inhibitory analysis of toxic compounds of different nature. Anal Chim Acta 2015; 854:161-8. [DOI: 10.1016/j.aca.2014.11.027] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2014] [Revised: 10/25/2014] [Accepted: 11/18/2014] [Indexed: 11/25/2022]
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Beri V, Wildman SA, Shiomi K, Al-Rashid ZF, Cheung J, Rosenberry TL. The natural product dihydrotanshinone I provides a prototype for uncharged inhibitors that bind specifically to the acetylcholinesterase peripheral site with nanomolar affinity. Biochemistry 2013; 52:7486-99. [PMID: 24040835 DOI: 10.1021/bi401043w] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cholinergic synaptic transmission often requires extremely rapid hydrolysis of acetylcholine by acetylcholinesterase (AChE). AChE is inactivated by organophosphates (OPs) in chemical warfare nerve agents. The resulting accumulation of acetylcholine disrupts cholinergic synaptic transmission and can lead to death. A potential long-term strategy for preventing AChE inactivation by OPs is based on evidence that OPs must pass through a peripheral site or P-site near the mouth of the AChE active site gorge before reacting with a catalytic serine in an acylation site or A-site at the base of the gorge. An ultimate goal of this strategy is to design compounds that bind tightly at or near the P-site and exclude OPs from the active site while interfering minimally with the passage of acetylcholine. However, to target the AChE P-site with ligands and potential drugs that selectively restrict access, much more information must be gathered about the structure-activity relationships of ligands that bind specifically to the P-site. We apply here an inhibitor competition assay that can correctly determine whether an AChE inhibitor binds to the P-site, the A-site, or both sites. We have used this assay to examine three uncharged, natural product inhibitors of AChE, including aflatoxin B1, dihydrotanshinone I, and territrem B. The first two of these inhibitors are predicted by the competition assay to bind selectively to the P-site, while territrem B is predicted to span both the P- and A-sites. These predictions have recently been confirmed by X-ray crystallography. Dihydrotanshinone I, with an observed binding constant (KI) of 750 nM, provides a good lead compound for the development of high-affinity, uncharged inhibitors with specificity for the P-site.
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Affiliation(s)
- Veena Beri
- Departments of Neuroscience and Pharmacology, Mayo Clinic College of Medicine , Jacksonville, Florida 32224, United States
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An ultrasensitive electrochemiluminescent immunoassay for aflatoxin M1 in milk, based on extraction by magnetic graphene and detection by antibody-labeled CdTe quantumn dots-carbon nanotubes nanocomposite. Toxins (Basel) 2013; 5:865-83. [PMID: 23628784 PMCID: PMC3709266 DOI: 10.3390/toxins5050865] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2013] [Revised: 04/15/2013] [Accepted: 04/16/2013] [Indexed: 12/02/2022] Open
Abstract
An ultrasensitive electrochemiluminescent immunoassay (ECLIA) for aflatoxins M1 (ATM1) in milk using magnetic Fe3O4-graphene oxides (Fe-GO) as the absorbent and antibody-labeled cadmium telluride quantum dots (CdTe QDs) as the signal tag is presented. Firstly, Fe3O4 nanoparticles were immobilized on GO to fabricate the magnetic nanocomposites, which were used as absorbent to ATM1. Secondly, aflatoxin M1 antibody (primary antibody, ATM1 Ab1), was attached to the surface of the CdTe QDs-carbon nanotubes nanocomposite to form the signal tag (ATM1 Ab1/CdTe-CNT). The above materials were characterized. The optimal experimental conditions were obtained. Thirdly, Fe-GO was employed for extraction of ATM1 in milk. Results indicated that it can adsorb ATM1 efficiently and selectively within a large extent of pH from 3.0 to 8.0. Adsorption processes reached 95% of the equilibrium within 10 min. Lastly, the ATM1 with a serial of concentrations absorbed on Fe-GO was conjugated with ATM1 Ab1/CdTe-CNT signal tag based on sandwich immunoassay. The immunocomplex can emit a strong ECL signal whose intensity depended linearly on the logarithm of ATM1 concentration from 1.0 to 1.0 × 105 pg/mL, with the detection limit (LOD) of 0.3 pg/mL (S/N = 3). The method was more sensitive for ATM1 detection compared to the ELISA method. Finally, ten samples of milk were tested based on the immunoassay. The method is fast and requires very little sample preparation, which was suitable for high-throughput screening of mycotoxins in food.
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Arduini F, Amine A. Biosensors based on enzyme inhibition. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2013; 140:299-326. [PMID: 23934362 DOI: 10.1007/10_2013_224] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The present chapter describes the use of biosensors based on enzyme inhibition as analytical tools. The parameters that affect biosensor sensitivity, such as the amount of immobilized enzyme, incubation time, and immobilization type, were critically evaluated, highlighting how the knowledge of enzymatic kinetics can help researchers optimize the biosensor in an easy and fast manner. The applications of these biosensors demonstrating their wide application have been reported. The objective of this survey is to give a critical description of biosensors based on enzyme inhibition, of their assembly, and their application in the environmental, food, and pharmaceutical fields.
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Affiliation(s)
- Fabiana Arduini
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma Tor Vergata, Via della Ricerca Scientifica, 00133, Rome, Italy,
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Puiu M, Istrate O, Rotariu L, Bala C. Kinetic approach of aflatoxin B1–acetylcholinesterase interaction: A tool for developing surface plasmon resonance biosensors. Anal Biochem 2012; 421:587-94. [DOI: 10.1016/j.ab.2011.10.035] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2011] [Revised: 10/16/2011] [Accepted: 10/17/2011] [Indexed: 11/28/2022]
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Campàs M, Garibo D, Prieto-Simón B. Novel nanobiotechnological concepts in electrochemical biosensors for the analysis of toxins. Analyst 2012; 137:1055-67. [DOI: 10.1039/c2an15736e] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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Pohanka M. CHOLINESTERASES, A TARGET OF PHARMACOLOGY AND TOXICOLOGY. Biomed Pap Med Fac Univ Palacky Olomouc Czech Repub 2011; 155:219-29. [DOI: 10.5507/bp.2011.036] [Citation(s) in RCA: 229] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Paniel N, Radoi A, Marty JL. Development of an electrochemical biosensor for the detection of aflatoxin M1 in milk. SENSORS (BASEL, SWITZERLAND) 2010; 10:9439-48. [PMID: 22163418 PMCID: PMC3230981 DOI: 10.3390/s101009439] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/09/2010] [Revised: 09/30/2010] [Accepted: 10/10/2010] [Indexed: 11/20/2022]
Abstract
We have developed an electrochemical immunosensor for the detection of ultratrace amounts of aflatoxin M(1) (AFM(1)) in food products. The sensor was based on a competitive immunoassay using horseradish peroxidase (HRP) as a tag. Magnetic nanoparticles coated with antibody (anti-AFM(1)) were used to separate the bound and unbound fractions. The samples containing AFM(1) were incubated with a fixed amount of antibody and tracer [AFM(1) linked to HRP (conjugate)] until the system reached equilibrium. Competition occurs between the antigen (AFM(1)) and the conjugate for the antibody. Then, the mixture was deposited on the surface of screen-printed carbon electrodes, and the mediator [5-methylphenazinium methyl sulphate (MPMS)] was added. The enzymatic response was measured amperometrically. A standard range (0, 0.005, 0.01, 0.025, 0.05, 0.1, 0.25, 0.3, 0.4 and 0.5 ppb) of AFM(1)-contaminated milk from the ELISA kit was used to obtain a standard curve for AFM(1). To test the detection sensitivity of our sensor, samples of commercial milk were supplemented at 0.01, 0.025, 0.05 or 0.1 ppb with AFM(1). Our immunosensor has a low detection limit (0.01 ppb), which is under the recommended level of AFM(1) [0.05 μg L-1 (ppb)], and has good reproducibility.
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Affiliation(s)
- Nathalie Paniel
- Laboratoire IMAGES EA 4218, Bâtiments S, Université de Perpignan Via Domitia, 52 Avenue Paul Alduy, 66860 Perpignan Cedex, France.
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22
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Maragos C, Busman M. Rapid and advanced tools for mycotoxin analysis: a review. Food Addit Contam Part A Chem Anal Control Expo Risk Assess 2010; 27:688-700. [DOI: 10.1080/19440040903515934] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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23
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Biosensors based on cholinesterase inhibition for insecticides, nerve agents and aflatoxin B1 detection (review). Mikrochim Acta 2010. [DOI: 10.1007/s00604-010-0317-1] [Citation(s) in RCA: 123] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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