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Ren Y, Tian R, Wang T, Cao J, Li J, Deng A. An Extremely Highly Sensitive ELISA in pg mL -1 Level Based on a Newly Produced Monoclonal Antibody for the Detection of Ochratoxin A in Food Samples. Molecules 2023; 28:5743. [PMID: 37570711 PMCID: PMC10420233 DOI: 10.3390/molecules28155743] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Revised: 07/14/2023] [Accepted: 07/24/2023] [Indexed: 08/13/2023] Open
Abstract
In this study, an extremely highly sensitive enzyme-linked immunosorbent assay (ELISA) based on a newly produced monoclonal antibody (mAb) for the detection of ochratoxin A (OTA) in food samples was developed. OTA-Bovine serum albumin (BSA) conjugate was prepared and used as the immunogen for the production of the mAb. Among four hybridoma clones (8B10, 5C2, 9B7, and 5E11), the antibody from 8B10 displayed the highest affinity recognition for OTA. Based on the mAb (8B10), the IC50 and LOD of the ELISA for OTA were 34.8 pg mL-1 and 1.5 pg mL-1, respectively, which was 1.53~147 times lower than those in published ELISAs, indicating the ultra-sensitivity of our assay. There was no cross-reactivity of the mAb with the other four mycotoxins (AFB1, ZEN, DON, and T-2). Due to the high similarity in molecular structures among OTA, ochratoxin B (OTB), and ochratoxin C (OTC), the CR values of the mAb with OTB and OTC were 96.67% and 22.02%, respectively. Taking this advantage, the ELISA may be able to evaluate total ochratoxin levels in food samples. The recoveries of the ELISA for OTA in spiked samples (corn, wheat, and feed) were 96.5-110.8%, 89.5-94.4%, and 91.8-113.3%; and the RSDs were 5.2-13.6%, 8.2-13.0%, and 7.7-13.7% (n = 3), respectively. The spiked food samples (corn) were measured by ELISA and HPLC-FLD simultaneously. A good correlation between ELISA (x) and HPLC-FLD (y) with the linear regression equation of y = 0.918x - 0.034 (R2 = 0.985, n = 5) was obtained. These results demonstrated that the newly produced mAb-based ELISA was a feasible and ultra-sensitive analytical method for the detection of OTA in food samples.
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Affiliation(s)
| | | | | | | | - Jianguo Li
- The Key Lab of Health Chemistry and Molecular Diagnosis of Suzhou, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Renai Road 199, Suzhou 215123, China; (Y.R.); (R.T.); (T.W.); (J.C.)
| | - Anping Deng
- The Key Lab of Health Chemistry and Molecular Diagnosis of Suzhou, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Renai Road 199, Suzhou 215123, China; (Y.R.); (R.T.); (T.W.); (J.C.)
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2
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Chen R, Wang H, Sun C, Zhao Y, He Y, Nisar MS, Wei W, Kang H, Xie X, Du C, Luo Q, Yang L, Tang X, Xiong B. Au@SiO 2 SERS nanotags based lateral flow immunoassay for simultaneous detection of aflatoxin B 1 and ochratoxin A. Talanta 2023; 258:124401. [PMID: 36867957 DOI: 10.1016/j.talanta.2023.124401] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Revised: 02/22/2023] [Accepted: 02/26/2023] [Indexed: 03/03/2023]
Abstract
Agricultural products are frequently contaminated by mycotoxins. Multiplex, ultrasensitive, and rapid determination of mycotoxins is still a challenging problem, which is of great significance to food safety and public health. Herein, a surface-enhanced Raman scattering (SERS) based lateral flow immunoassay (LFA) for the simultaneous on-site determination of aflatoxin B1 (AFB1) and ochratoxin A (OTA) on the same test line (T line) was developed, in this study. In practice, two kinds of Raman reporters 4-mercaptobenzoic acid (4-MBA), and 5,5'-dithiobis-(2-nitrobenzoic acid) (DTNB) encoded silica-encapsulated gold nanotags (Au4-MBA@SiO2 and AuDNTB@SiO2) were used as detection markers to identify the two different mycotoxins. Through systematic optimization of the experimental conditions, this biosensor has high sensitivity and multiplexing with the limits of detection (LODs) at 0.24 pg mL-1 for AFB1 and 0.37 pg mL-1 for OTA. These are far below the regulatory limits set by the European Commission, in which the minimum LODs for AFB1 and OTA are 2.0 and 3.0 μg kg-1. In the spiked experiment, the food matrix are corn, rice, and wheat, and the mean recoveries of the two mycotoxins ranged from 91.0% ± 6.3%-104.8% ± 5.6% for AFB1 and 87.0% ± 4.2%-112.0% ± 3.3% for OTA. These results demonstrate that the developed immunoassay has good stability, selectivity, and reliability, which can be used for routine monitoring of mycotoxin contamination.
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Affiliation(s)
- Ruipeng Chen
- State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Hui Wang
- State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Chaoqun Sun
- College of Animal Science & Technology, Guangxi University, Nanning, Guangxi, 530004, China
| | - Yiguang Zhao
- State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Yue He
- State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Muhammad Shemyal Nisar
- Sino-British College, University of Shanghai for Science and Technology, Shanghai, 200093, China
| | - Wensong Wei
- Institute of Food Science and Technology, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Haiqi Kang
- College of Economics and Management, Beijing University of Agriculture, Beijing, 102206, China
| | - Xiulan Xie
- State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Chunmei Du
- State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Qingyao Luo
- State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Liang Yang
- State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, China.
| | - Xiangfang Tang
- State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, China.
| | - Benhai Xiong
- State Key Laboratory of Animal Nutrition, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, China.
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Guo M, zhang J, Lv J, Ke T, Tian J, Miao K, Wang Y, Kong D, Ruan H, Luo J, Yang M. Development of broad-specific monoclonal antibody-based immunoassays for simultaneous ochratoxin screening in medicinal and edible herbs. Food Control 2023. [DOI: 10.1016/j.foodcont.2023.109626] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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4
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Tian C, Wei M, Wang X, Hua Q, Tang F, Zhao L, Zhuang X, Luan F. Electrochemiluminescence Aptasensor Based on Gd(OH) 3 Nanocrystalline for Ochratoxin A Detection in Food Samples. BIOSENSORS 2022; 12:1141. [PMID: 36551108 PMCID: PMC9775045 DOI: 10.3390/bios12121141] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Revised: 12/02/2022] [Accepted: 12/02/2022] [Indexed: 06/17/2023]
Abstract
In the present study, the electrochemiluminescence (ECL) properties of Gd(OH)3 nanocrystals with K2S2O8 as the cathode coreactant were studied for the first time. Based on the prominent ECL behavior of this material and the excellent specificity of the aptamer technique, an ECL aptasensor for the detection of ochratoxin A (OTA) was formulated successfully. Over an OTA concentration range of 0.01 pg mL-1 to 10 ng mL-1, the change in the ECL signal was highly linear with the OTA concentration, and the limit of detection (LOD) was 0.0027 pg mL-1. Finally, the ECL aptasensor was further used to detect OTA in real samples (grapes and corn) and satisfactory results were obtained, which indicated that the built method is expected to be applied in food detection.
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He K, Sun L, Wang L, Li W, Hu G, Ji X, Zhang Y, Xu X. Engineering DNA G-quadruplex assembly for label-free detection of Ochratoxin A in colorimetric and fluorescent dual modes. JOURNAL OF HAZARDOUS MATERIALS 2022; 423:126962. [PMID: 34464866 DOI: 10.1016/j.jhazmat.2021.126962] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2021] [Revised: 08/10/2021] [Accepted: 08/17/2021] [Indexed: 06/13/2023]
Abstract
Colorimetric and fluorescent methods for Ochratoxin A (OTA) detection are convenient and well received. However, the pigments and autofluorescence originated from food matrices often interfere with detection signals. We have developed a strategy with colorimetric and fluorescent dual modes to solve this challenge. In the colorimetric mode, OTA aptamer (AP9) was assembled into a DNA triple-helix switch with a specially designed signal-amplifying sequence. The OTA-induced G-quadruplex (G4) of AP9 would open the switch and release the signal-amplifying sequence for colorimetric signal amplification. The G4 structures of AP9 were further utilized to combine with the fluorogenic dye ThT for fluorescent mode. By skillfully engineering DNA G4 assembly for signal amplification, there was no need for any DNA amplification or nanomaterials labeling. Detections could be carried out in a wide temperature range (22-37 ℃) and finished rapidly (colorimetric mode, 60 min; fluorescent mode, 15 min). Broad linear ranges (colorimetric mode, 10-1.5 ×103 μg/kg; fluorescent mode, 0.05-1.0 ×103 μg/kg) were achieved. The limit of detection for colorimetric and fluorescent modes were 4 μg/kg and 0.01 μg/kg, respectively. The two modes have been successfully applied to detect OTA in samples with intrinsic pigments and autofluorescence, showing their applicability and reliability.
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Affiliation(s)
- Kaiyu He
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Agro-product Safety and Nutrition, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
| | - Liping Sun
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Agro-product Safety and Nutrition, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
| | - Liu Wang
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Agro-product Safety and Nutrition, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
| | - Wang Li
- College of Food Science & Engineering, Central South University of Forestry & Technology, Changsha 410004, China
| | - Guixian Hu
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Agro-product Safety and Nutrition, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
| | - Xiaofeng Ji
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Agro-product Safety and Nutrition, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
| | - Yiming Zhang
- School of Agriculture and Food Science, Zhejiang A&F University, Hangzhou 311300, China.
| | - Xiahong Xu
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, Institute of Agro-product Safety and Nutrition, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China.
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An Aptamer-Array-Based Sample-to-Answer Biosensor for Ochratoxin A Detection via Fluorescence Resonance Energy Transfer. CHEMOSENSORS 2021. [DOI: 10.3390/chemosensors9110309] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Food toxins are a hidden threat that can cause cancer and tremendously impact human health. Therefore, the detection of food toxins in a timely manner with high sensitivity is of paramount importance for public health and food safety. However, the current detection methods are relatively time-consuming and not practical for field tests. In the present work, we developed a novel aptamer-chip-based sample-to-answer biosensor (ACSB) for ochratoxin A (OTA) detection via fluorescence resonance energy transfer (FRET). In this system, a cyanine 3 (Cy3)-labeled OTA-specific biotinylated aptamer was immobilized on an epoxy-coated chip via streptavidin-biotin binding. A complementary DNA strand to OTA aptamer at the 3′-end was labeled with a black hole quencher 2 (BHQ2) to quench Cy3 fluorescence when in proximity. In the presence of OTA, the Cy3-labeled OTA aptamer bound specifically to OTA and led to the physical separation of Cy3 and BHQ2, which resulted in an increase of fluorescence signal. The limit of detection (LOD) of this ACSB for OTA was 0.005 ng/mL with a linearity range of 0.01–10 ng/mL. The cross-reactivity of ACSB against other mycotoxins, ochratoxin B (OTB), aflatoxin B1 (AFB1), zearalenone (ZEA), or deoxynilvalenol (DON), was less than 0.01%. In addition, this system could accurately detect OTA in rice samples spiked with OTA, and the mean recovery rate of the spiked-in OTA reached 91%, with a coefficient of variation (CV) of 8.57–9.89%. Collectively, the ACSB may represent a rapid, accurate, and easy-to-use platform for OTA detection with high sensitivity and specificity.
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7
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Amplified Fluorescent Aptasensor for Ochratoxin A Assay Based on Graphene Oxide and RecJ f Exonuclease. Toxins (Basel) 2020; 12:toxins12110670. [PMID: 33113906 PMCID: PMC7690689 DOI: 10.3390/toxins12110670] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 10/10/2020] [Accepted: 10/21/2020] [Indexed: 01/14/2023] Open
Abstract
In this study, we developed an aptamer-based fluorescent sensing platform for the detection of ochratoxin A (OTA) based on RecJf exonuclease-assisted signal amplification and interaction between graphene oxide (GO) and the OTA aptamer (OTA-apt). After optimizing the experimental conditions, the present aptamer-based sensing system can exhibit excellent fluorescent response in the OTA assay, with a limit of detection of 0.07 ng/mL. In addition to signal amplification, this strategy is also highly specific for other interfering toxins. Furthermore, this aptasensor can be reliably used for assessing red wine samples spiked with different OTA concentrations (2.4, 6 and 20 ng/mL). The proposed assay plays an important role in the field of food safety and can be transformed for detecting other toxins by replacing the sequence that recognizes the aptamer.
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Xu S, Guo L, Chen L, Luo F, Qiu B, Lin Z. Dark field microscope-based single nanoparticle identification coupled with statistical analysis for ultrasensitive biotoxin detection in complex sample matrix. Mikrochim Acta 2020; 187:413. [PMID: 32601890 DOI: 10.1007/s00604-020-04386-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2020] [Accepted: 06/13/2020] [Indexed: 11/29/2022]
Abstract
A novel approach for ultrasensitive ochratoxin A (OTA) detection is reported based on dark field microscope-based single nanoparticle identification coupled with a statistical analysis method. OTA aptamers were firstly hybridized with a single-stranded DNA (DNA1) to form an identification probe (DNA1-Apt). The aptamers separate from DNA1 in the presence of OTA and are released from the identification probe. Then, another single-stranded DNA (DNA2) hybridizes with DNA1 and result in the aggregation of gold nanoparticles (AuNPs). Therefore, the presence of AuNP aggregates is the evidence of the presence of OTA, while AuNP aggregates can be easily identified together with the monomers under dark field microscopic inspection. On the other hand, by counting the aggregation rate (the number of AuNP aggregates versus the number of AuNP monomers) with a statistical analysis method, OTA could be quantitatively detected. The detection range for OTA was 0.1 pg/mL ~ 30 ng/mL and the limit of detection was 0.1 pg/mL. The proposed sensor has comparative detection performance to sensors utilizing a number of signal amplification procedures, with the additional advantages of simplicity and high efficiency. The sensor can also be adopted for other target detection simply by replacing the identification probes. Graphical abstract The schematic of the AuNP aggregation for OTA detection. The OTA aptamers were competitively banded by OTA and induced form AuNP aggregation after adding DNA2 and AuNPs2. Subsequently, AuNPs were detected under dark field microscope and statistical analysis.
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Affiliation(s)
- Shaohua Xu
- Ministry of Education Key Laboratory for Analytical Science of Food Safety and Biology, Fujian Provincial Key Laboratory of Analysis and Detection for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, 350116, Fujian, China
| | - Longhua Guo
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing, 314001, China.
| | - Lifen Chen
- College of Biological, Chemical Sciences and Engineering, Jiaxing University, Jiaxing, 314001, China.
| | - Fang Luo
- Ministry of Education Key Laboratory for Analytical Science of Food Safety and Biology, Fujian Provincial Key Laboratory of Analysis and Detection for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, 350116, Fujian, China
| | - Bin Qiu
- Ministry of Education Key Laboratory for Analytical Science of Food Safety and Biology, Fujian Provincial Key Laboratory of Analysis and Detection for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, 350116, Fujian, China.
| | - Zhenyu Lin
- Ministry of Education Key Laboratory for Analytical Science of Food Safety and Biology, Fujian Provincial Key Laboratory of Analysis and Detection for Food Safety, College of Chemistry, Fuzhou University, Fuzhou, 350116, Fujian, China
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9
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Barbosa AI, Borges J, Meira DI, Costa D, Rodrigues MS, Rebelo R, Correlo VM, Vaz F, Reis RL. Development of label-free plasmonic Au-TiO 2 thin film immunosensor devices. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 100:424-432. [PMID: 30948078 DOI: 10.1016/j.msec.2019.03.029] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2018] [Revised: 02/07/2019] [Accepted: 03/08/2019] [Indexed: 12/17/2022]
Abstract
This work reports on the development of a label-free immunosensor technology, based on nanoplasmonic Au-TiO2 thin films. The Au-TiO2 thin films were prepared by cost-effective reactive DC magnetron sputtering, followed by a thermal annealing procedure. The latter promoted the growth of the Au nanoparticles throughout the TiO2 matrix and induced some morphological changes, which are the base for the immunosensor device functionality. A posterior plasma etching treatment was required to partially expose the nanoparticles to the biological environment. It gave rise to a 6-fold increase of the total area of gold exposed, allowing further possibilities for the sensor sensitivity enhancement. Experimental results demonstrated the successful functionalization of the films' surface with antibodies, with the immobilization occurring preferentially in the exposed nanoparticles and negligibly on the TiO2 matrix. Antibody adsorption surface coverage studies revealed antibody low affinity to the film's surface. Nevertheless, immunoassay development experiments showed a strong and active immobilized antibody monolayer at an optimized antibody concentration. This allowed a 236 signal-to-noise-ratio in a confocal microscope, using mouse IgG and 100 ng/ml of Fab-specific anti-mouse IgG-FITC conjugated. Label-free detection of the optimized antibody monolayer on Au-TiO2 thin films was also tested, revealing an expected redshift in the LSPR band, which demonstrates the suitability for the development of cost-effective, label-free LSPR based immunosensor devices.
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Affiliation(s)
- Ana I Barbosa
- 3B's Research Group, I3Bs - Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, 4805-017 Barco, Guimarães, Portugal; ICVS/3B's-PT Government Associate Laboratory, Braga, Guimarães, Portugal
| | - Joel Borges
- Centro de Física, Universidade do Minho, Campus de Gualtar, 4710-057 Braga, Portugal.
| | - Diana I Meira
- Centro de Física, Universidade do Minho, Campus de Gualtar, 4710-057 Braga, Portugal
| | - Diogo Costa
- Centro de Física, Universidade do Minho, Campus de Gualtar, 4710-057 Braga, Portugal
| | - Marco S Rodrigues
- Centro de Física, Universidade do Minho, Campus de Gualtar, 4710-057 Braga, Portugal
| | - Rita Rebelo
- 3B's Research Group, I3Bs - Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, 4805-017 Barco, Guimarães, Portugal; ICVS/3B's-PT Government Associate Laboratory, Braga, Guimarães, Portugal
| | - Vitor M Correlo
- 3B's Research Group, I3Bs - Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, 4805-017 Barco, Guimarães, Portugal; ICVS/3B's-PT Government Associate Laboratory, Braga, Guimarães, Portugal; The Discoveries Centre for Regenerative and Precision Medicine, Headquarters at University of Minho, AvePark, 4805-017 Barco, Guimarães, Portugal
| | - Filipe Vaz
- Centro de Física, Universidade do Minho, Campus de Gualtar, 4710-057 Braga, Portugal
| | - Rui L Reis
- 3B's Research Group, I3Bs - Research Institute on Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Parque de Ciência e Tecnologia, Zona Industrial da Gandra, 4805-017 Barco, Guimarães, Portugal; ICVS/3B's-PT Government Associate Laboratory, Braga, Guimarães, Portugal; The Discoveries Centre for Regenerative and Precision Medicine, Headquarters at University of Minho, AvePark, 4805-017 Barco, Guimarães, Portugal
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Aptamer-Based Fluorometric Ochratoxin A Assay Based on Photoinduced Electron Transfer. Toxins (Basel) 2019; 11:toxins11020065. [PMID: 30678367 PMCID: PMC6410015 DOI: 10.3390/toxins11020065] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2019] [Accepted: 01/22/2019] [Indexed: 12/24/2022] Open
Abstract
This study describes a novel quencher-free fluorescent method for ochratoxin A (OTA) detection based on the photoinduced electron transfer (PIET) between guanine and fluorophore. In the absence of OTA, carboxyfluorescein (FAM)-labeled aptamer can partly hybridize with the complementary strand of OTA aptamer (OTA-cAPT), which contains four guanines at its 3′-end. As a result, the fluorescence of FAM is quenched due to PIET and stacked guanines. In the presence of OTA, FAM-labeled OTA aptamer can bind specifically to OTA, and thereby the high fluorescence intensity of the dye can be maintained. Under the optimal conditions, the method had a detection limit of 1.3 nM. In addition, the method we proposed is highly sensitive and specific for OTA. Furthermore, the method was proven to be reliable based on its successful application in the detection of OTA in red wine samples. Therefore, this promising, facile, and quencher-free method may be applied to detect other toxins by using other appropriate aptamers.
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Shao B, Ma X, Zhao S, Lv Y, Hun X, Wang H, Wang Z. Nanogapped Au(core) @ Au-Ag(shell) structures coupled with Fe3O4 magnetic nanoparticles for the detection of Ochratoxin A. Anal Chim Acta 2018; 1033:165-172. [DOI: 10.1016/j.aca.2018.05.058] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Revised: 05/03/2018] [Accepted: 05/23/2018] [Indexed: 01/06/2023]
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12
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Nie J, Yuan L, Jin K, Han X, Tian Y, Zhou N. Electrochemical detection of tobramycin based on enzymes-assisted dual signal amplification by using a novel truncated aptamer with high affinity. Biosens Bioelectron 2018; 122:254-262. [PMID: 30268963 DOI: 10.1016/j.bios.2018.09.072] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2018] [Revised: 09/12/2018] [Accepted: 09/20/2018] [Indexed: 11/16/2022]
Abstract
An aptamer with the length of only 15 nucleotides specific for tobramycin was obtained through rationally designed truncation from a previously reported long sequence. The structural and binding properties of the aptamer were characterized. The dissociation constant (Kd) was determined to be 42.12 nM, indicating high affinity of the aptamer for tobramycin. Then an electrochemical sensor based on this aptamer was developed, which employed an enzymes-assisted dual signal amplification cycle through target recycling and strand-displacement DNA polymerization. A hairpin probe containing the aptamer sequence was designed and used to start the production cycle of a short ssDNA fragment in the presence of tobramycin, with the help of phi29 DNA polymerase and nicking endonuclease Nt.AlwI. The ssDNA fragment was captured by a signal transduction probe modified on gold electrode to form a triple-helix structure. With the help of [Ru(NH3)6]3+, a significant electrochemical signal was observed in differential pulse voltammetry (DPV). Under the optimal conditions, the current in DPV is linearly related with the concentration of tobramycin in the range of 10-200 nM, and the detection limit is 5.13 nM. The electrochemical sensor showed high specificity for tobramycin when it was challenged by other antibiotics. In addition, the constructed sensor was used to detect tobramycin in milk and water samples, and showed satisfactory performance. Therefore, the screened aptamer as well as the developed sensor has great application prospects in the fields of food safety control, medical test and environment monitoring.
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Affiliation(s)
- Jingjing Nie
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China
| | - Luyi Yuan
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China
| | - Ke Jin
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China
| | - Xuyan Han
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China
| | - Yaping Tian
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China
| | - Nandi Zhou
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi 214122, China.
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13
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Development of a Sensitive Enzyme-Linked Immunosorbent Assay and Rapid Gold Nanoparticle Immunochromatographic Strip for Detecting Citrinin in Monascus Fermented Food. Toxins (Basel) 2018; 10:toxins10090354. [PMID: 30200526 PMCID: PMC6162752 DOI: 10.3390/toxins10090354] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2018] [Revised: 08/28/2018] [Accepted: 08/28/2018] [Indexed: 12/12/2022] Open
Abstract
Antibodies against citrinin (CTN) were generated from rabbits, which were injected with CTN-keyhole limpet hemocyanin (KLH). This work involved the development of a sensitive competitive direct enzyme-linked immunosorbent assay (cdELISA) and a rapid gold nanoparticle immunochromatographic strip (immunostrip) method for analyzing CTN in Monascus-fermented food. CTN at a concentration of 5.0 ng/mL caused 50% inhibition (IC50) of CTN-horseradish peroxidase (CTN-HRP) binding to the antibodies in the cdELISA. The capable on-site detection of CTN was accomplished by a rapid antibody-gold nanoparticle immunostrip with a detection limit of 20 ng/mL and that was completed within 15 min. A close inspection of 19 Monascus-fermented foods by cdELISA confirmed that 14 were contaminated with citrinin at levels from 28.6⁻9454 ng/g. Further analysis with the immunostrip is consistent with those results obtained using cdELISA. Both means are sensitive enough for the rapid examination of CTN in Monascus-fermented food products.
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Fluorometric aptamer-based determination of ochratoxin A based on the use of graphene oxide and RNase H-aided amplification. Mikrochim Acta 2018; 185:347. [PMID: 29961128 DOI: 10.1007/s00604-018-2885-4] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Accepted: 06/25/2018] [Indexed: 12/14/2022]
Abstract
The authors describe a fluorometric assay for ochratoxin A (OTA) that is based on the use of graphene oxide and RNase H-aided amplification. On addition of OTA, cAPT is replaced from the APT/cAPT hybridization complex and then hybridizes with RNA labeled with a fluorophore at the 5'-end. Eventually, the fluorophore is released by RNase H cleavage. As the concentration of OTA increases, more cAPTs are displaced, this leading to fluorescence enhancement (best measured at excitation/emission wavelengths of 495/515 nm). This RNase H-assisted cycle response results in strong signal amplification. The limit of detection, calculated on the basis of a signal to noise ratio of 3, is 0.08 ng·mL-1. Response is linear in the 0.08-200 ng·mL-1 OTA concentration range. The method is highly selective for OTA over ochratoxin B and aflatoxin B1. It was applied to the determination of OTA in red wine samples spiked at levels of 1, 7, and 50 ng·mL-1, and the recoveries ranged from 90.9 to 112%. Graphical abstract Schematic of a novel fluorometric aptasensor for ochratoxin A based on the use of graphene oxide and RNase H-aided amplification.
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15
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López-Puertollano D, Mercader JV, Agulló C, Abad-Somovilla A, Abad-Fuentes A. Novel haptens and monoclonal antibodies with subnanomolar affinity for a classical analytical target, ochratoxin A. Sci Rep 2018; 8:9761. [PMID: 29950703 PMCID: PMC6021394 DOI: 10.1038/s41598-018-28138-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Accepted: 06/18/2018] [Indexed: 01/28/2023] Open
Abstract
Ochratoxin A is a potent toxic fungal metabolite whose undesirable presence in food commodities constitutes a problem of public health, so it is strictly regulated and controlled. For the first time, two derivatives of ochratoxin A (OTAb and OTAd) functionalized through positions other than the native carboxyl group of the mycotoxin, have been synthesized in order to better mimic, during the immunization process, the steric and conformational properties of the target analyte. Additionally, two conventional haptens making use of that native carboxyl group for protein coupling (OTAe and OTAf) were also prepared as controls for the purpose of comparison. The immunological performance in rabbits of protein conjugates based on OTAb and OTAd overcome that of conjugates employing OTAe and OTAf as haptens. After immunization of mice with OTAb and OTAd conjugates, a collection of high-affinity monoclonal antibodies to ochratoxin A was generated. In particular, one of those antibodies, the so-called OTAb#311, is very likely the best antibody produced so far in terms of selectivity and affinity to ochratoxin A.
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Affiliation(s)
- Daniel López-Puertollano
- Department of Organic Chemistry, University of Valencia, Doctor Moliner 50, 46100, Burjassot, Valencia, Spain
| | - Josep V Mercader
- Institute of Agrochemistry and Food Technology (IATA), Spanish National Research Council (CSIC), Agustí Escardino 7, 46980, Paterna, Valencia, Spain
| | - Consuelo Agulló
- Department of Organic Chemistry, University of Valencia, Doctor Moliner 50, 46100, Burjassot, Valencia, Spain
| | - Antonio Abad-Somovilla
- Department of Organic Chemistry, University of Valencia, Doctor Moliner 50, 46100, Burjassot, Valencia, Spain
| | - Antonio Abad-Fuentes
- Institute of Agrochemistry and Food Technology (IATA), Spanish National Research Council (CSIC), Agustí Escardino 7, 46980, Paterna, Valencia, Spain.
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16
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Shen P, Li W, Ding Z, Deng Y, Liu Y, Zhu X, Cai T, Li J, Zheng T. A competitive aptamer chemiluminescence assay for ochratoxin A using a single silica photonic crystal microsphere. Anal Biochem 2018; 554:28-33. [PMID: 29860095 DOI: 10.1016/j.ab.2018.05.025] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Revised: 05/25/2018] [Accepted: 05/25/2018] [Indexed: 12/27/2022]
Abstract
We designed a competitive aptamer chemiluminescence assay for ochratoxin A (OTA) on the surface of a single silica photonic crystal microsphere (SPCM) in cereal samples. The structural color of SPCMs is used to recognize and trace the microspheres during process of detection. Anti-aptamer was immobilized on the surface of SPCM. OTA and anti-aptamer competed to bind to aptamer when OTA and its aptamer (labeled by biotin at 5'end) were added in the system. The chemiluminescence signal was developed by the horseradish peroxidase (HRP), luminol and H2O2. The molecules on the single SPCM can produce enough chemiluminescence signal intensity for quantitative detection for OTA. The linear detection range for OTA was from 1 pg/mL to 1 ng/mL and recovery rates were 89%-95%, 81%-92% and 94%-105% in rice, wheat and corn, respectively. The results showed that the developed method for OTA using a single SPCM has a great application potential in cereal samples.
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Affiliation(s)
- Peng Shen
- Department of Food Science and Engineering, Nanjing Normal University, Nanjing, 210024, China
| | - Wei Li
- Department of Electronic and Electrical Engineering, The University of Sheffield, Sheffield, S3 7HQ, United Kingdom
| | - Zhi Ding
- Department of Food Science and Engineering, Nanjing Normal University, Nanjing, 210024, China
| | - Yang Deng
- Department of Food Science and Engineering, Nanjing Normal University, Nanjing, 210024, China
| | - Yan Liu
- Department of Food Science and Engineering, Nanjing Normal University, Nanjing, 210024, China
| | - Xuerui Zhu
- Department of Food Science and Engineering, Nanjing Normal University, Nanjing, 210024, China
| | - Tingting Cai
- Department of Food Science and Engineering, Nanjing Normal University, Nanjing, 210024, China
| | - Jianlin Li
- Department of Food Science and Engineering, Nanjing Normal University, Nanjing, 210024, China.
| | - Tiesong Zheng
- Department of Food Science and Engineering, Nanjing Normal University, Nanjing, 210024, China
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Wang C, Tan R, Chen D. Fluorescence method for quickly detecting ochratoxin A in flour and beer using nitrogen doped carbon dots and silver nanoparticles. Talanta 2018; 182:363-370. [PMID: 29501165 DOI: 10.1016/j.talanta.2018.02.007] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Revised: 01/19/2018] [Accepted: 02/04/2018] [Indexed: 12/14/2022]
Abstract
In this paper, a FRET (Forster resonance energy transfer) based fluorescence method was developed for the quickly detection of ochratoxin A (OTA) in agricultural products (e.g., flour and beer). A highly fluorescent nitrogen doped carbon dots (CD) were served as energy donor, the DNA and MCH (6-mercapto-1-hexanol) modified Ag nanoparticles were served as energy acceptor in the FRET system. OTA can be detected in a concentration range between 10 and 5000 nM, the limit of detection is 8.7 nM. This method has three advantages: (1) an enhanced fluorescent intensity can be acquired by utilizing the nitrogen doped CD synthesized by one-step approach without sophisticated modification of nanoparticles; (2) OTA detection was accomplished quickly (less than 30 min) by using MCH as assistant molecule; (3) an extended OTA detection linear range was acquired, which may facilitate the OTA detection in real agricultural samples, and is helpful for solving food safety problems.
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Affiliation(s)
- Chengke Wang
- College of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, PR China.
| | - Rong Tan
- College of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, PR China
| | - Dan Chen
- College of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, PR China
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18
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Oplatowska-Stachowiak M, Kleintjens T, Sajic N, Haasnoot W, Campbell K, Elliott CT, Salden M. T-2 Toxin/HT-2 Toxin and Ochratoxin A ELISAs Development and In-House Validation in Food in Accordance with the Commission Regulation (EU) No 519/2014. Toxins (Basel) 2017; 9:E388. [PMID: 29189752 PMCID: PMC5744108 DOI: 10.3390/toxins9120388] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Revised: 11/25/2017] [Accepted: 11/29/2017] [Indexed: 11/23/2022] Open
Abstract
T-2 toxin/HT-2 toxin (T-2/HT-2) and ochratoxin A (OTA) are mycotoxins that can contaminate a variety of agricultural commodities. To protect consumers' health, indicative limits for T-2/HT-2 and maximum limits for OTA have been set by the European Commission, requiring food business operators and controlling agencies to conduct routine checks for the presence of these harmful contaminants. Screening methods are increasingly used for monitoring purposes. Due to the demand for new and improved screening tools, two individual detection methods, T-2/HT-2 and OTA enzyme-linked immunosorbent assays (ELISAs), were developed in this study. The T-2/HT-2 ELISA was based on a T-2 monoclonal antibody with an IC50 (50% inhibitory concentration) of 0.28 ng/mL and 125% cross-reactivity with HT-2. As regards the OTA ELISA, a new sensitive monoclonal antibody specific to OTA with an IC50 of 0.13 ng/mL was produced. Both developed ELISA tests were then validated in agricultural commodities in accordance with the new performance criteria guidelines for the validation of screening methods for mycotoxins included in Commission Regulation (EU) No 519/2014. The T-2/HT-2 ELISA was demonstrated to be suitable for the detection of T-2/HT-2 in cereals and baby food at and above the screening target concentration (STC) of 12.5 μg/kg and 7.5 μg/kg, respectively. The OTA ELISA was shown to be applicable for the detection of OTA in cereals, coffee, cocoa and wine at and above the STC of 2 μg/kg, 2.5 μg/kg, 2.5 μg/kg and 0.4 ng/mL, respectively. The accuracy of both ELISAs was further confirmed by analysing proficiency test and reference samples. The developed methods can be used for sensitive and high-throughput screening for the presence of T-2/HT-2 and OTA in agricultural commodities.
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Affiliation(s)
| | | | - Nermin Sajic
- EuroProxima B.V., Arnhem 6827 BN, The Netherlands.
| | | | - Katrina Campbell
- Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, Belfast BT9 5BN, UK.
| | - Christopher T Elliott
- Institute for Global Food Security, School of Biological Sciences, Queen's University Belfast, Belfast BT9 5BN, UK.
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19
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Zhang Y, Wang L, Shen X, Wei X, Huang X, Liu Y, Sun X, Wang Z, Sun Y, Xu Z, Eremin SA, Lei H. Broad-Specificity Immunoassay for Simultaneous Detection of Ochratoxins A, B, and C in Millet and Maize. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2017; 65:4830-4838. [PMID: 28535353 DOI: 10.1021/acs.jafc.7b00770] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Ochratoxins A, B, and C (OTA, OTB, and OTC) can be found in cereals and feeds; the simultaneous detection of these ochratoxins holds a great need in food safety. In this study, four antibodies raised from two ochrotoxin haptens and two coating antigens were compared, and then a sensitive and broad-specificity enzyme-linked immunosorbent assay (ELISA) was established for the simultaneous determination of three ochratoxins, where the detection limits were 0.005, 0.001, and 0.001 ng/mL for OTA, OTB, and OTC, respectively, and recoveries of three ochratoxins were between 84.3% and 111.7%. This developed method had been successfully applied to detect ochratoxins in both millet and maize. Molecular modeling revealed that the broad-specificity was related with the chlorine electronegativity on OTA and OTC and the potential of the acetyl ester group on OTC. The proposed ELISA can be used for simultaneous detection of three ochratoxins.
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Affiliation(s)
| | | | | | | | - Xinan Huang
- Tropical Medicine Institute & South China Chinese Medicine Collaborative Innovation Center, Guangzhou University of Chinese Medicine , Guangzhou 510405, China
| | | | - Xiulan Sun
- State Key Laboratory of Food Science and Technology, School of Food Science of Jiangnan University , Wuxi, Jiangsu 214122, China
| | - Zhanhui Wang
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University , Beijing 100094, China
| | | | | | - Sergei A Eremin
- Faculty of Chemistry, M.V. Lomonosov Moscow State University , Leninskie gory 1, Building 3, Moscow 119991, Russia
- A.N. Bach Institute of Biochemistry, Research Center of Biotechnology of the Russian Academy of Sciences , Moscow 119071, Russia
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20
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Amperometric aptasensor for ochratoxin A based on the use of a gold electrode modified with aptamer, complementary DNA, SWCNTs and the redox marker Methylene Blue. Mikrochim Acta 2017. [DOI: 10.1007/s00604-017-2113-7] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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21
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Qing Y, Li X, Chen S, Zhou X, Luo M, Xu X, Li C, Qiu J. Differential pulse voltammetric ochratoxin A assay based on the use of an aptamer and hybridization chain reaction. Mikrochim Acta 2017. [DOI: 10.1007/s00604-017-2080-z] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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22
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Karczmarczyk A, Reiner-Rozman C, Hageneder S, Dubiak-Szepietowska M, Dostálek J, Feller KH. Fast and sensitive detection of ochratoxin A in red wine by nanoparticle-enhanced SPR. Anal Chim Acta 2016; 937:143-50. [PMID: 27590556 DOI: 10.1016/j.aca.2016.07.034] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Revised: 07/11/2016] [Accepted: 07/21/2016] [Indexed: 11/28/2022]
Abstract
Herein, we present a fast and sensitive biosensor for detection of Ochratoxin A (OTA) in a red wine that utilizes gold nanoparticle-enhanced surface plasmon resonance (SPR). By combining an indirect competitive inhibition immunoassay and signal enhancement by secondary antibodies conjugated with gold nanoparticles (AuNPs), highly sensitive detection of low molecular weight compounds (such as OTA) was achieved. The reported biosensor allowed for OTA detection at concentrations as low as 0.75 ng mL(-1) and its limit of detection was improved by more than one order of magnitude to 0.068 ng mL(-1) by applying AuNPs as a signal enhancer. The study investigates the interplay of size of AuNPs and affinity of recognition elements affecting the efficiency of the signal amplification strategy based on AuNP. Furthermore, we observed that the presence of polyphenolic compounds in wine samples strongly interferes with the affinity binding on the surface. To overcome this limitation, a simple pre-treatment of the wine sample with the binding agent poly(vinylpyrrolidone) (PVP) was successfully applied.
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Affiliation(s)
- Aleksandra Karczmarczyk
- Department of Medical Engineering and Biotechnology, Ernst-Abbe-University of Applied Sciences Jena, Carl-Zeiss Promenade 2, 07745, Jena, Germany; Institute of Analytical Chemistry, University of Regensburg, Josef-EngertStraße, 93053, Regensburg, Germany.
| | - Ciril Reiner-Rozman
- BioSensor Technologies, AIT Austrian Institute of Technologies GmbH, Muthgasse 11, 1190, Wien, Austria; CEST Kompetenzzentrum für elektrochemische Oberflächentechnologie GmbH, Viktor-Kaplan-Strasse 2, 2700, Wr. Neustadt, Austria
| | - Simone Hageneder
- BioSensor Technologies, AIT Austrian Institute of Technologies GmbH, Muthgasse 11, 1190, Wien, Austria
| | - Monika Dubiak-Szepietowska
- Department of Medical Engineering and Biotechnology, Ernst-Abbe-University of Applied Sciences Jena, Carl-Zeiss Promenade 2, 07745, Jena, Germany
| | - Jakub Dostálek
- BioSensor Technologies, AIT Austrian Institute of Technologies GmbH, Muthgasse 11, 1190, Wien, Austria
| | - Karl-Heinz Feller
- Department of Medical Engineering and Biotechnology, Ernst-Abbe-University of Applied Sciences Jena, Carl-Zeiss Promenade 2, 07745, Jena, Germany
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23
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Nameghi MA, Danesh NM, Ramezani M, Hassani FV, Abnous K, Taghdisi SM. A fluorescent aptasensor based on a DNA pyramid nanostructure for ultrasensitive detection of ochratoxin A. Anal Bioanal Chem 2016; 408:5811-5818. [PMID: 27311951 DOI: 10.1007/s00216-016-9693-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2016] [Revised: 06/02/2016] [Accepted: 06/04/2016] [Indexed: 12/14/2022]
Abstract
Analytical techniques for detection of ochratoxin A (OTA) in food products and blood serum are of great significance. In this study, a fluorescent aptasensor was developed for sensitive and specific detection of OTA, based on a DNA pyramid nanostructure (DPN) and PicoGreen (PG) dye. The designed aptasensor inherits characteristics of DPN, such as high stability and capacity for PG loading. PG, as a fluorescent dye, could bind to double-stranded DNA (dsDNA). In the absence of OTA, the pyramid structure of DPN remains intact, leading to a very strong fluorescence emission. Because of higher affinity of aptamer for its target relative to its complementary strand, upon addition of target, the pyramid structure of DPN is disassembled, leading to a weak fluorescence emission. The presented aptasensor showed high specificity toward OTA with a limit of detection (LOD) as low as 0.135 nM. Besides, the designed sensing strategy was successfully utilized to recognize OTA in serum and grape juice with LODs of 0.184 and 0.149 nM, respectively.
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Affiliation(s)
| | - Noor Mohammad Danesh
- Nanotechnology Research Center, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Razavi Khorasan, Iran.,Research Institute of Sciences and New Technology, Mashhad, Razavi Khorasan, Iran
| | - Mohammad Ramezani
- Nanotechnology Research Center, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Razavi Khorasan, Iran
| | - Faezeh Vahdati Hassani
- School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Razavi Khorasan, Iran
| | - Khalil Abnous
- Pharmaceutical Research Center, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Razavi Khorasan, Iran.
| | - Seyed Mohammad Taghdisi
- Targeted Drug Delivery Research Center, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Razavi Khorasan, Iran.
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Rapid Detection of Ochratoxin A in Malt by Cytometric Bead Array Based on Indirect Competition Principle. CHINESE JOURNAL OF ANALYTICAL CHEMISTRY 2016. [DOI: 10.1016/s1872-2040(16)60927-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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25
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Taghdisi SM, Danesh NM, Beheshti HR, Ramezani M, Abnous K. A novel fluorescent aptasensor based on gold and silica nanoparticles for the ultrasensitive detection of ochratoxin A. NANOSCALE 2016; 8:3439-3446. [PMID: 26791437 DOI: 10.1039/c5nr08234j] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Analytical approaches for the detection and quantitation of ochratoxin A (OTA) in blood serum and food products are high in demand. In this study, a fluorescent aptamer-based sensor (aptasensor) is developed for the selective and sensitive detection of OTA, based on a complementary strand of aptamer (CS) and two types of nanoparticles, gold nanoparticles (AuNPs) and silica nanoparticles (SNPs) coated with streptavidin. The fabricated aptasensor inherits the characteristics of SNPs, as enhancers of fluorescence intensity; AuNPs, such as large surface area and unique optical properties; and high affinity of the aptamer toward its target compared to its CS. In the absence of OTA, no FAM and biotin-labeled CS is in the environment of the SNPs coated with streptavidin, which leads to no fluorescence emission. In the presence of the target, an FAM and biotin-labeled CS-SNPs coated with streptavidin conjugate is formed, thus resulting in a very strong fluorescence emission. The designed fluorescent aptasensor exhibits high selectivity toward OTA with a limit of detection (LOD) as low as 0.098 nM. Furthermore, the fabricated aptasensor was successfully applied for the detection of OTA in grape juice and serum with LODs of 0.113 and 0.152 nM, respectively.
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Affiliation(s)
- Seyed Mohammad Taghdisi
- Targeted Drug Delivery Research Center, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
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26
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Identification of a high-affinity monoclonal antibody against ochratoxin A and its application in enzyme-linked immunosorbent assay. Toxicon 2015; 106:89-96. [PMID: 26410110 DOI: 10.1016/j.toxicon.2015.09.028] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Revised: 09/16/2015] [Accepted: 09/21/2015] [Indexed: 12/31/2022]
Abstract
Ochratoxin A (OTA) is one of the most commonly occurring mycotoxins produced by some species of Aspergillus and can contaminate cereal and cereal products. A high-affinity anti-OTA monoclonal antibody (mAb) was generated from a hybridoma cell line 2D8 using splenocytes from a BALB/c mouse immunized with synthesized OTA-bovine serum albumin conjugate. The mAb 2D8 is specific with high affinity (3.75 × 10(9) L/M). An indirect competitive ELISA (ic-ELISA) was then developed using this mAb for quantitative determination of OTA in corn and feed samples. Using the optimized conditions, there was good linearity between OTA concentration and competitive inhibition (y = -0.6076x + 0.2441, R(2) = 0.9923) with the working range from 2.4 to 23.6 μg/kg, IC50 at 7.6 μg/kg and lower limit of detection at 1.4 μg/kg. The recovery rates in spiked samples were 91.2-110.3%. Of the 56 corn and feed samples, this ic-ELISA and a commercial kit both found the same 13 samples positive for OTA with good linear correlation between the two methods in OTA quantification (R(2) = 0.9706). We conclude that this ic-ELISA can be used for rapid and quantitative screening of corn and feed samples for the presence of OTA.
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Venkataramana M, Rashmi R, Uppalapati SR, Chandranayaka S, Balakrishna K, Radhika M, Gupta VK, Batra HV. Development of sandwich dot-ELISA for specific detection of Ochratoxin A and its application on to contaminated cereal grains originating from India. Front Microbiol 2015; 6:511. [PMID: 26074899 PMCID: PMC4443250 DOI: 10.3389/fmicb.2015.00511] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2015] [Accepted: 05/08/2015] [Indexed: 01/20/2023] Open
Abstract
In the present study, generation and characterization of a highly specific monoclonal antibody (mAb) against Ochratoxin A (OTA) was undertaken. The generated mAb was further used to develop a simple, fast, and sensitive sandwich dot-ELISA (s-dot ELISA) method for detection of OTA from contaminated food grain samples. The limit of detection (LOD) of the developed enzyme-linked immunosorbent assay (ELISA) method was determined as 5.0 ng/mL of OTA. Developed method was more specific toward OTA and no cross reactivity was observed with the other tested mycotoxins such as deoxynivalenol, fumonisin B1, or aflatoxin B1. To assess the utility and reliability of the developed method, several field samples of maize, wheat and rice (n = 195) collected from different geographical regions of southern Karnataka region of India were evaluated for the OTA occurrence. Seventy two out of 195 samples (19 maize, 38 wheat, and 15 rice) were found to be contaminated by OTA by s-dot ELISA. The assay results were further co-evaluated with conventional analytical high-performance liquid chromatography (HPLC) method. Results of the s-dot ELISA are in concordance with HPLC except for three samples that were negative for OTA presence by s-dot ELISA but found positive by HPLC. Although positive by HPLC, the amount of OTA in the three samples was found to be lesser than the accepted levels (>5 μg/kg) of OTA presence in cereals. Therefore, in conclusion, the developed s-dot ELISA is a better alternative for routine cereal based food and feed analysis in diagnostic labs to check the presence of OTA over existing conventional culture based, tedious analytical methods.
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Affiliation(s)
- M. Venkataramana
- Division of Toxicology and Immunology, DRDO-BU Center for Life Sciences, Bharathiar University, CoimbatoreIndia
| | - R. Rashmi
- Microbiology Division, Defence Food Research Laboratory, MysoreIndia
| | | | - S. Chandranayaka
- Department of Studies in Biotechnology, University of MysoreMysore, India
| | - K. Balakrishna
- Microbiology Division, Defence Food Research Laboratory, MysoreIndia
| | - M. Radhika
- Microbiology Division, Defence Food Research Laboratory, MysoreIndia
| | - Vijai K. Gupta
- Discipline of Biochemistry, School of Natural Sciences, National University of Ireland GalwayGalway, Ireland
| | - H. V. Batra
- Microbiology Division, Defence Food Research Laboratory, MysoreIndia
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28
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Kavanagh O, Elliott CT, Campbell K. Progress in the development of immunoanalytical methods incorporating recombinant antibodies to small molecular weight biotoxins. Anal Bioanal Chem 2015; 407:2749-70. [PMID: 25716465 DOI: 10.1007/s00216-015-8502-z] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2014] [Revised: 01/15/2015] [Accepted: 01/19/2015] [Indexed: 01/08/2023]
Abstract
Rapid immunoanalytical screening of food and environmental samples for small molecular weight (hapten) biotoxin contaminations requires the production of antibody reagents that possess the requisite sensitivity and specificity. To date animal-derived polyclonal (pAb) and monoclonal (mAb) antibodies have provided the binding element of the majority of these assays but recombinant antibodies (rAb) isolated from in vitro combinatorial phage display libraries are an exciting alternative due to (1) circumventing the need for experimental animals, (2) speed of production in commonly used in vitro expression systems and (3) subsequent molecular enhancement of binder performance. Short chain variable fragments (scFv) have been the most commonly employed rAb reagents for hapten biotoxin detection over the last two decades but antibody binding fragments (Fab) and single domain antibodies (sdAb) are increasing in popularity due to increased expression efficiency of functional binders and superior resistance to solvents. rAb-based immunochromatographic assays and surface plasmon resonance (SPR) biosensors have been reported to detect sub-regulatory levels of fungal (mycotoxins), marine (phycotoxins) and aquatic biotoxins in a wide range of food and environmental matrices, however this technology has yet to surpass the performances of the equivalent mAb- and pAb-based formats. As such the full potential of rAb technology in hapten biotoxin detection has yet to be achieved, but in time the inherent advantages of engineered rAb are set to provide the next generation of ultra-high performing binder reagents for the rapid and specific detection of hapten biotoxins.
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Affiliation(s)
- Owen Kavanagh
- Institute for Global Food Security (IGFS), School of Biological Sciences, Queen's University Belfast, Belfast, Northern Ireland, UK,
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Majdinasab M, Sheikh-Zeinoddin M, Soleimanian-Zad S, Li P, Zhang Q, Li X, Tang X, Li J. A reliable and sensitive time-resolved fluorescent immunochromatographic assay (TRFICA) for ochratoxin A in agro-products. Food Control 2015. [DOI: 10.1016/j.foodcont.2014.06.044] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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30
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Wang C, Dong X, Liu Q, Wang K. Label-free colorimetric aptasensor for sensitive detection of ochratoxin A utilizing hybridization chain reaction. Anal Chim Acta 2014; 860:83-8. [PMID: 25682251 DOI: 10.1016/j.aca.2014.12.031] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2014] [Revised: 12/14/2014] [Accepted: 12/15/2014] [Indexed: 11/25/2022]
Abstract
The combination of high selectivity of aptamer with the peroxidase-mimicking property of DNAzyme has presented considerable opportunities for designing colorimetric aptasensor for detection of ochratoxin A (OTA). The activities of both aptamer (as biorecognition element) and DNAzyme (as signal amplification element) are blocked via base pairing in the hairpin structure. Hybridization chain reaction (HCR) between two hairpin DNAs was employed to further improve the sensitivity of this method. The presence of OTA triggers the opening of the hairpin structure and the beginning of HCR, which results in the release of many DNAzyme, and generates enhanced colorimetric signals, which is correlated to the amounts of OTA with linear range between 0.01 to 0.32 nM, and the limit of detection is 0.01 nM under optimal conditions. OTA in yellow rice wine and wheat flour samples was also detected using this method. We demonstrate that a new colorimetric method for the detection of OTA has been established, which is simple, easy to conduct, label-free, sensitive, high throughput, and cost-saving.
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Affiliation(s)
- Chengke Wang
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang 212013, PR China
| | - Xiaoya Dong
- Key Laboratory of Modern Agriculture Equipment and Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China
| | - Qian Liu
- Key Laboratory of Modern Agriculture Equipment and Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China
| | - Kun Wang
- Key Laboratory of Modern Agriculture Equipment and Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, PR China.
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31
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Jin N, Ling S, Yang C, Wang S. Preparation and identification of monoclonal antibody against Citreoviridin and development of detection by Ic-ELISA. Toxicon 2014; 90:226-36. [DOI: 10.1016/j.toxicon.2014.08.057] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2014] [Revised: 08/10/2014] [Accepted: 08/13/2014] [Indexed: 10/24/2022]
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32
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Lee HJ, Meldrum AD, Rivera N, Ryu D. Cross-reactivity of antibodies with phenolic compounds in pistachios during quantification of ochratoxin A by commercial enzyme-linked immunosorbent assay kits. J Food Prot 2014; 77:1754-9. [PMID: 25285493 DOI: 10.4315/0362-028x.jfp-14-189] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Ochratoxin A (OTA), a nephrotoxic mycotoxin, naturally occurs in wide range of agricultural commodities. Typical screening of OTA involves various enzyme-linked immunosorbent assay (ELISA) methods. Pistachio (Pistacia vera L.) is a rich source of phenolic compounds that may result in a false positive due to structural similarities to OTA. The present study investigated the cross-reactivity profiles of phenolic compounds using two commercial ELISA test kits. High-performance liquid chromatography was used to confirm the concentration of OTA in the pistachio samples and compared with the results obtained from ELISA. When the degree of interaction and 50 % inhibitory concentration of phenolic compounds were determined, the cross-reactivity showed a pattern similar to that observed with the commercial ELSIA kits, although quantitatively different. In addition, the degree of interaction increased with the increasing concentration of phenolic compounds. The ELISA value had stronger correlations with the content of total phenolic compound, gallic acid, and catechin (R(2) = 0.757, 0.732, and 0.729, respectively) compared with epicatechin (R(2) = 0.590). These results suggest that phenolic compounds in pistachio skins may cross-react with the OTA antibody and lead to a false positive or to an overestimation of OTA concentration in ELISA-based tests.
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Affiliation(s)
- Hyun Jung Lee
- School of Food Science, University of Idaho, 875 Perimeter Drive MS 2312, Moscow, Idaho 83844-2312, USA
| | - Alexander D Meldrum
- School of Food Science, University of Idaho, 875 Perimeter Drive MS 2312, Moscow, Idaho 83844-2312, USA
| | - Nicholas Rivera
- School of Food Science, Washington State University, P.O. Box 646376, Pullman, Washington 99164-6376, USA
| | - Dojin Ryu
- School of Food Science, University of Idaho, 875 Perimeter Drive MS 2312, Moscow, Idaho 83844-2312, USA.
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Lv Z, Chen A, Liu J, Guan Z, Zhou Y, Xu S, Yang S, Li C. A simple and sensitive approach for ochratoxin A detection using a label-free fluorescent aptasensor. PLoS One 2014; 9:e85968. [PMID: 24465818 PMCID: PMC3897567 DOI: 10.1371/journal.pone.0085968] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2013] [Accepted: 12/09/2013] [Indexed: 11/19/2022] Open
Abstract
Ochratoxin A(OTA) is found to be one of the predominant contaminating mycotoxins in a wide variety of food commodities. To avoid the risk of OTA consumption, the detection and quantitation of OTA level are of great significance. Based on the fact that ssDNA aptamer has the ability to form a double-strand structure with its complementary sequence, a simple and rapid aptamer-based label-free approach for highly sensitive and selective fluorescence detection of OTA was developed by using ultra-sensitive double-strand DNA specific dyes PicoGreen. The results showed that as low as 1 ng/mL of OTA could be detected with a dynamic range of more than 5 orders of magnitude which satisfies the requirements for OTA maximum residue limit in various food regulated by European Commission. With the specificity of aptamer, the assay exhibited high selectivity for OTA against two other analogues (N-acetyl-l-phenylalanine and zearalenone). We also tested the aptasensor practicability using real sample of 1% beer spiked with a series of concentration of OTA and the results show good tolerance to matrix effect. All detections could be achieved in less than 30 min, which provides a simple, quick and sensitive detection method for OTA screening in food safety and could be easily extend to other small molecular chemical compounds detection which aptamer has been selected.
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Affiliation(s)
- Zhenzhen Lv
- College of Food Science, Sichuan Agricultural University, Ya'an, China
- Institute of Quality Standards & Testing Technology for Agro-Products, Key Laboratory of Agro-product Quality and Safety, Chinese Academy of Agricultural Sciences, Beijing, China
- Key Laboratory of Agri-Food Quality and Safety, Ministry of Agriculture, Beijing, China
| | - Ailiang Chen
- Institute of Quality Standards & Testing Technology for Agro-Products, Key Laboratory of Agro-product Quality and Safety, Chinese Academy of Agricultural Sciences, Beijing, China
- Key Laboratory of Agri-Food Quality and Safety, Ministry of Agriculture, Beijing, China
- * E-mail: (AC); (CL)
| | - Jinchuan Liu
- Institute of Quality Standards & Testing Technology for Agro-Products, Key Laboratory of Agro-product Quality and Safety, Chinese Academy of Agricultural Sciences, Beijing, China
- Key Laboratory of Agri-Food Quality and Safety, Ministry of Agriculture, Beijing, China
| | - Zheng Guan
- Institute of Quality Standards & Testing Technology for Agro-Products, Key Laboratory of Agro-product Quality and Safety, Chinese Academy of Agricultural Sciences, Beijing, China
- Key Laboratory of Agri-Food Quality and Safety, Ministry of Agriculture, Beijing, China
| | - Yu Zhou
- Institute of Quality Standards & Testing Technology for Agro-Products, Key Laboratory of Agro-product Quality and Safety, Chinese Academy of Agricultural Sciences, Beijing, China
- Key Laboratory of Agri-Food Quality and Safety, Ministry of Agriculture, Beijing, China
| | - Siyuan Xu
- Institute of Quality Standards & Testing Technology for Agro-Products, Key Laboratory of Agro-product Quality and Safety, Chinese Academy of Agricultural Sciences, Beijing, China
- Key Laboratory of Agri-Food Quality and Safety, Ministry of Agriculture, Beijing, China
| | - Shuming Yang
- Institute of Quality Standards & Testing Technology for Agro-Products, Key Laboratory of Agro-product Quality and Safety, Chinese Academy of Agricultural Sciences, Beijing, China
- Key Laboratory of Agri-Food Quality and Safety, Ministry of Agriculture, Beijing, China
| | - Cheng Li
- College of Food Science, Sichuan Agricultural University, Ya'an, China
- * E-mail: (AC); (CL)
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Yang X, Qian J, Jiang L, Yan Y, Wang K, Liu Q, Wang K. Ultrasensitive electrochemical aptasensor for ochratoxin A based on two-level cascaded signal amplification strategy. Bioelectrochemistry 2013; 96:7-13. [PMID: 24355136 DOI: 10.1016/j.bioelechem.2013.11.006] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2013] [Revised: 11/21/2013] [Accepted: 11/24/2013] [Indexed: 01/21/2023]
Abstract
Ochratoxin A (OTA) has a number of toxic effects to both humans and animals, so developing sensitive detection method is of great importance. Herein, we describe an ultrasensitive electrochemical aptasensor for OTA based on the two-level cascaded signal amplification strategy with methylene blue (MB) as a redox indicator. In this method, capture DNA, aptamers, and reporter DNA functionalized-gold nanoparticles (GNPs) were immobilized on the electrode accordingly, where GNPs were used as the first-level signal enhancer. To receive the more sensitive response, a larger number of guanine (G)-rich DNA was bound to the GNPs' surface to provide abundant anchoring sites for MB to achieve the second-level signal amplification. By employing this novel strategy, an ~8.5 (±0.3) fold amplification in signal intensity was obtained. Afterward, OTA was added to force partial GNPs/G-rich DNA to release from the sensing interface and thus decreased the electrochemical response. An effective sensing range from 2.5pM to 2.5nM was received with an extremely low detection limit of 0.75 (±0.12) pM. This amplification strategy has the potential to be the main technology for aptamer-based electrochemical biosensor in a variety of fields.
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Affiliation(s)
- Xingwang Yang
- Key Laboratory of Modern Agriculture Equipment and Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, P.R. China
| | - Jing Qian
- Key Laboratory of Modern Agriculture Equipment and Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, P.R. China
| | - Ling Jiang
- Key Laboratory of Modern Agriculture Equipment and Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, P.R. China
| | - Yuting Yan
- Key Laboratory of Modern Agriculture Equipment and Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, P.R. China
| | - Kan Wang
- Key Laboratory of Modern Agriculture Equipment and Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, P.R. China
| | - Qian Liu
- Key Laboratory of Modern Agriculture Equipment and Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, P.R. China
| | - Kun Wang
- Key Laboratory of Modern Agriculture Equipment and Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang, 212013, P.R. China.
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Determination of Ochratoxin A in Cereals and Feeds by Ultra-performance Liquid Chromatography Coupled to Tandem Mass Spectrometry with Immunoaffinity Column Clean-up. FOOD ANAL METHOD 2013. [DOI: 10.1007/s12161-013-9692-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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36
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Artificial antigen synthesis and the development of polyclonal antibody-based immunoassay for citreoviridin determination. World J Microbiol Biotechnol 2013; 30:343-9. [PMID: 23900904 DOI: 10.1007/s11274-013-1431-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2012] [Accepted: 07/09/2013] [Indexed: 10/26/2022]
Abstract
Citreoviridin, a mycotoxin produced by Penicillium citreonigrum is a common contaminant of wide range of agri-products and detrimental to human and animal health. Therefore it is important to develop a rapid, sensitive, and specific immunoassay for citreoviridin detection. In this study, polyclonal antibody against citreoviridin was developed. For the preparation of citreoviridin-bovine serum albumin conjugate (CIT-BSA), hydroxyl groups on adjacent carbon atoms were oxidized by sodium periodate, so the product with reactive aldehyde residues was suitable for coupling with amine. Anti-citreoviridin polyclonal antibody was prepared by immunizing mice with CIT-BSA conjugate. The specificity and sensitivity of the polyclonal antibody was determined by indirect competitive ELISA. Results showed that the IC50 value of the polyclonal antibody was 0.56 μg/mL and no cross-reactivity was found between antiserum and other mycotoxins used in the experiment. The citreoviridin recovery rates by this polyclonal antibody were calculated through rice powder spiked by artificial citreoviridin. The recovery rates ranged were found from 70.5 ± 0.08 % to 94.7 ± 0.09% for inter-assay, and from 77.5 ± 0.04% to 95.4 ± 0.18% for intra-assay, which indicated that this polyclonal antibody could detect trace amount of CIT from the tested samples. Consequently, this study provided a specific and sensitive anti-citreoviridin polyclonal antibody, which made the determination of citreoviridin easier, quicker, and more accurate.
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37
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Colour-encoded paramagnetic microbead-based direct inhibition triplex flow cytometric immunoassay for ochratoxin A, fumonisins and zearalenone in cereals and cereal-based feed. Anal Bioanal Chem 2013; 405:7783-94. [PMID: 23760139 PMCID: PMC3765849 DOI: 10.1007/s00216-013-7095-7] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2013] [Revised: 05/16/2013] [Accepted: 05/23/2013] [Indexed: 12/04/2022]
Abstract
A combined (triplex) immunoassay for the simultaneous detection of three mycotoxins in grains was developed with superparamagnetic colour-encoded microbeads, in combination with two bead-dedicated flow cytometers. Monoclonal antibodies were coupled to the beads, and the amounts of bound mycotoxins were inversely related to the amounts of bound fluorescent labelled mycotoxins (inhibition immunoassay format). The selected monoclonal antibodies were tested for their target mycotoxins and for cross-reactivity with relevant metabolites and masked mycotoxins. In the triplex format, low levels of cross-interactions between the assays occurred at irrelevant high levels only. All three assays were influenced by the sample matrix of cereal extracts to some extent, and matrix-matched calibrations are recommended for quantitative screening purposes. In a preliminary in-house validation, the triplex assay was found to be reproducible, sensitive and sufficiently accurate for the quantitative screening at ML level. The triplex assay was critically compared to liquid chromatography–tandem mass spectrometry using reference materials and fortified blank material. Results for the quantification of ochratoxin A and zearalenone were in good agreement. However, the fumonisin assay was, due to overestimation, only suitable for qualitative judgements. Both flow cytometer platforms (Luminex 100 and FLEXMAP 3D) performed similar with respect to sensitivity with the advantages of a higher sample throughput and response range of the FLEXMAP 3D and lower cost of the Luminex 100. The priciple of the direct inhibition microbead immunoassay using fluorescent mycotoxin-reporter conjugates ![]()
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38
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Vdovenko MM, Hung CT, Sakharov IY, Yu FY. Determination of okadaic acid in shellfish by using a novel chemiluminescent enzyme-linked immunosorbent assay method. Talanta 2013; 116:343-6. [PMID: 24148413 DOI: 10.1016/j.talanta.2013.05.057] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2013] [Revised: 05/22/2013] [Accepted: 05/23/2013] [Indexed: 10/26/2022]
Abstract
A direct competitive chemiluminescent enzyme-linked immunosorbent assay (CL-ELISA) was developed to determine okadaic acid (OA). Concentrations of the capture monoclonal anti-OA antibodies, conjugate of OA-HRP and a composition of blocking buffers were varied to optimize the assay condition. The values of IC10, IC50 and working range (IC20-IC80) for CL-ELISA were 0.01, 0.07, and 0.03-0.2 ng/mL, respectively. Additionally, the analytical recovery values of CL-ELISA from 3 shellfish spiked samples with OA concentrations of 0.03, 0.1 and 0.2 ng/mL ranged from 86.7% to 111.2%. Closely examining the OA concentrations in 19 various shellfish products performed by CL-ELISA revealed that OA concentrations in 6 of the 19 examined samples was undetected, whereas the 13 samples were contaminated with low levels of OA ranging from 1.2 to 8.0 ng/g.
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Affiliation(s)
- Marina M Vdovenko
- Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia
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39
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Detecting aflatoxin B1 in foods and feeds by using sensitive rapid enzyme-linked immunosorbent assay and gold nanoparticle immunochromatographic strip. Food Control 2013. [DOI: 10.1016/j.foodcont.2012.07.008] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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40
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Matsumoto T, Yamaguchi H, Kamijo K, Akiyoshi M, Matsunaga T, Harada A. Development and Characterization of a Monoclonal Antibody against Triacetone Triperoxide. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2013. [DOI: 10.1246/bcsj.20120253] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
| | - Hiroyasu Yamaguchi
- Department of Macromolecular Science, Graduate School of Science, Osaka University
| | | | - Miyako Akiyoshi
- Energetic Materials Group, Research Institute of Science for Safety and Sustainability, National Institute of Advanced Industrial Science and Technology
| | - Takehiro Matsunaga
- Energetic Materials Group, Research Institute of Science for Safety and Sustainability, National Institute of Advanced Industrial Science and Technology
| | - Akira Harada
- Department of Macromolecular Science, Graduate School of Science, Osaka University
- Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency (JST)
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41
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Grandke J, Oberleitner L, Resch-Genger U, Garbe LA, Schneider RJ. Quality assurance in immunoassay performance—comparison of different enzyme immunoassays for the determination of caffeine in consumer products. Anal Bioanal Chem 2012; 405:1601-11. [DOI: 10.1007/s00216-012-6596-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2012] [Revised: 11/19/2012] [Accepted: 11/21/2012] [Indexed: 11/24/2022]
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42
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Zhang J, Zhang X, Yang G, Chen J, Wang S. A signal-on fluorescent aptasensor based on Tb3+ and structure-switching aptamer for label-free detection of Ochratoxin A in wheat. Biosens Bioelectron 2012; 41:704-9. [PMID: 23089328 DOI: 10.1016/j.bios.2012.09.053] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2012] [Revised: 09/13/2012] [Accepted: 09/25/2012] [Indexed: 01/19/2023]
Abstract
On the basis of Tb(3+), structure-switching aptamer and magnetic beads (MBs), a signal-on fluorescent aptasensor was developed for the label-free determination of OTA in wheat. Initially, the specific sequence of the anti-OTA aptamer labeled with a biotin group, was attached to streptavidin-modified MBs. Two single-stranded signal probes were added and naturally hybridized with anti-OTA aptamer to form the duplex structure in the solution. Due to the fact that single-stranded oligonucleotides can greatly enhance the emission of Tb(3+) in solution but duplexes do not, through magnetic separation, the supernatant liquid of the above solution contained no single-stranded DNA and cannot increase the emission of Tb(3+). While upon OTA addition, it will bind with aptamer to form OTA-aptamer G-quadruplex while releasing two single-stranded signal probes. Through magnetic separation, the released single-stranded signal probes left in the supernatant liquid can dramatically increase the fluorescent intensity of Tb(3+). By employing the above strategy, this aptasensor can detect as low as 20 pg/mL OTA with high specificity. To the best of our knowledge, the proposed aptasensor is the first attempt to use the fluorescent characteristics of Tb(3+) for OTA detection, which may represent a promising path toward routine quality control of food safety.
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Affiliation(s)
- Jing Zhang
- The Ministry of Education Key Laboratory of Biopesticide and Chemical Biology, and College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, Fujian 350002, China
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Yang C, Lates V, Prieto-Simón B, Marty JL, Yang X. Aptamer-DNAzyme hairpins for biosensing of Ochratoxin A. Biosens Bioelectron 2011; 32:208-12. [PMID: 22221796 DOI: 10.1016/j.bios.2011.12.011] [Citation(s) in RCA: 107] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2011] [Accepted: 12/05/2011] [Indexed: 12/14/2022]
Abstract
We report an aptasensor for biosensing of Ochratoxin A (OTA) using aptamer-DNAzyme hairpin as biorecognition element. The structure of this engineered nucleic acid includes the horseradish peroxidase (HRP)-mimicking DNAzyme and the OTA specific aptamer sequences. A blocking tail captures a part of these sequences in the stem region of the hairpin. In the presence of OTA, the hairpin is opened due to the formation of the aptamer-analyte complex. As a result, self-assembly of the active HRP-mimicking DNAzyme occurs. The activity of this DNAzyme is linearly correlated with OTA concentration up to 10 nM, showing a limit of detection of 2.5 nM.
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Affiliation(s)
- Cheng Yang
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China
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Zhang A, Ma Y, Feng L, Wang Y, He C, Wang X, Zhang H. Development of a sensitive competitive indirect ELISA method for determination of ochratoxin A levels in cereals originating from Nanjing, China. Food Control 2011. [DOI: 10.1016/j.foodcont.2011.04.004] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Fernández-Baldo MA, Bertolino FA, Fernández G, Messina GA, Sanz MI, Raba J. Determination of Ochratoxin A in apples contaminated with Aspergillus ochraceus by using a microfluidic competitive immunosensor with magnetic nanoparticles. Analyst 2011; 136:2756-62. [PMID: 21611646 DOI: 10.1039/c1an15148g] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ochratoxin A (OTA) is a mycotoxin produced by filamentous fungi of the genus Aspergillus and Penicillium that presents carcinogenic, teratogenic and nephrotoxic properties. In this work, we have developed, characterized and applied an immunoassay methodology comprised of magnetic nanoparticles (MNPs) as platform for immobilizing bioactive materials incorporated into a microfluidic system for rapid and sensitive quantification of Ochratoxin A (OTA) in apples (Red Delicious) contaminated with Aspergillus ochraceus. The sensor has the potential for automation and the detection of OTA was carried out using a competitive indirect immunoassay method based on the use of anti-OTA monoclonal antibodies immobilized on 3-aminopropyl-modified MNPs. The total assay time into the microfluidic competitive immunosensor was 16 min, and the calculated detection limit was 0.05 µg kg(-1). Moreover, the intra- and inter-assay coefficients of variation were below 6.5%. The proposed method can be a very promising analytical tool for the determination of OTA in apparently healthy fruits post-harvest and for its application in the agricultural industry.
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Affiliation(s)
- Martín A Fernández-Baldo
- INQUISAL, Departamento de Química, Universidad Nacional de San Luis, CONICET, San Luis, Argentina
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46
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Zhang H, Wang S, Fang G. Applications and recent developments of multi-analyte simultaneous analysis by enzyme-linked immunosorbent assays. J Immunol Methods 2011; 368:1-23. [DOI: 10.1016/j.jim.2011.02.011] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2010] [Revised: 01/31/2011] [Accepted: 02/23/2011] [Indexed: 11/25/2022]
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47
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Yu FY, Vdovenko MM, Wang JJ, Sakharov IY. Comparison of enzyme-linked immunosorbent assays with chemiluminescent and colorimetric detection for the determination of ochratoxin A in food. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2011; 59:809-813. [PMID: 21204536 DOI: 10.1021/jf103261u] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A direct competitive chemiluminescent enzyme-linked immunosorbent assay (CL-ELISA) for the determination of ochratoxin A (OTA) was developed using soybean peroxidase (SbP) in combination with 3-(10'-phenothiazinyl)propane-1-sulfonate (SPTZ) and 4-morpholinopyridine (MORPH) as a detection system. By varying the concentrations of the capture monoclonal anti-OTA antibody, a conjugate of OTA with SbP, and the composition of blocking buffers, the conditions of the immunoassay were optimized. Advantages of CL-ELISA were demonstrated by comparison with ELISA with colorimetric detection (COL-ELISA). The values of IC₁₀, IC₅₀, and working range (IC₂₀-IC₈₀) for CL-ELISA and COL-ELISA were 0.01, 0.08, and 0.02-0.3 ng/mL and 0.08, 0.58, and 0.17-2.2 ng/mL, respectively. The recovery values of CL-ELISA from three soybean spiked samples with OTA concentrations of 0.07, 0.1, and 0.15 ng/mL ranged from 72 to 125%. Determination of OTA in 21 various agricultural commodities showed that OTA in 8 examined samples was not detected by COL-ELISA. Furthermore, it was found that in 4 of these 8 samples the developed CL-ELISA determined OTA at levels from 0.96 to 4.64 ng/g.
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Affiliation(s)
- Feng-Yih Yu
- Department of Biomedical Sciences, Chung Shan Medical University, Taichung, Taiwan
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Fabiani A, Corzani C, Arfelli G. Correlation between different clean-up methods and analytical techniques performances to detect Ochratoxin A in wine. Talanta 2010; 83:281-5. [DOI: 10.1016/j.talanta.2010.08.027] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2010] [Revised: 07/30/2010] [Accepted: 08/17/2010] [Indexed: 11/16/2022]
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Yang C, Wang Y, Marty JL, Yang X. Aptamer-based colorimetric biosensing of Ochratoxin A using unmodified gold nanoparticles indicator. Biosens Bioelectron 2010; 26:2724-7. [PMID: 20970980 DOI: 10.1016/j.bios.2010.09.032] [Citation(s) in RCA: 247] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2010] [Revised: 09/14/2010] [Accepted: 09/18/2010] [Indexed: 11/16/2022]
Abstract
This work presents an aptasensor for Ochratoxin A (OTA) using unmodified gold nanoparticles (AuNPs) indicator. The assay method is based on the conformation change of OTA's aptamer in phosphate buffered saline (PBS) containing Mg(2+) and OTA, and the phenomenon of salt-induced AuNPs aggregation. A single measurement took only five minutes. Circular dichroism spectroscopic experiments revealed for the first time that upon the addition of OTA, the conformation of OTA's aptamer in PBS buffer changed from random coil structure to compact rigid antiparallel G-quadruplex structure. This compact rigid G-quadruplex structure could not protect AuNPs against salt-induced aggregation, and thus the color change from red to blue could be observed by the naked eye. The linear range of the colorimetric aptasensor covered a large variation of OTA concentration from 20 to 625 nM and the detection limit of 20 nM (3σ) was obtained.
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Affiliation(s)
- Cheng Yang
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, China
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Urusov AE, Zherdev AV, Dzantiev BB. Immunochemical methods of mycotoxin analysis (review). APPL BIOCHEM MICRO+ 2010. [DOI: 10.1134/s0003683810030038] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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