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Cheng Y, Tian DY, Chen CL, Bao N, Wu ZQ. Determination of indole-3-acetic acid using disposable molecularly imprinted electrochemical sensors based on bifunctional monomers. Mikrochim Acta 2024; 191:628. [PMID: 39327334 DOI: 10.1007/s00604-024-06717-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2024] [Accepted: 09/18/2024] [Indexed: 09/28/2024]
Abstract
Stainless steel sheets were coated with carbon ink to obtain disposable carbon electrodes, which were used as supports for moleculary imprinted polymer (MIP) electrochemical sensors by electropolymerizing o-phenylenediamine and o-aminophenol along with indole-3-acetic acid (IAA) as the template. After optimization, the MIP biosensors could be used for sensitive and selective detection of IAA with the limit of quantification of 0.1 µM. Our experimental results showed that stable and reproducible electrochemical responses could be achieved for the disposable MIP biosensors. This approach was successfully used for detection of IAA in different tissues of pea sprouts. This study reveals the potential of MIP electrochemical sensors in practical applications and shrinks the trench between the research and the real world.
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Affiliation(s)
- Ye Cheng
- School of Public Health, Nantong University, 9 Seyuan Rd, Nantong, 226019, Jiangsu, China
| | - Dong-Yang Tian
- School of Public Health, Nantong University, 9 Seyuan Rd, Nantong, 226019, Jiangsu, China
| | - Cui-Li Chen
- School of Public Health, Nantong University, 9 Seyuan Rd, Nantong, 226019, Jiangsu, China
| | - Ning Bao
- School of Public Health, Nantong University, 9 Seyuan Rd, Nantong, 226019, Jiangsu, China.
| | - Zeng-Qiang Wu
- School of Public Health, Nantong University, 9 Seyuan Rd, Nantong, 226019, Jiangsu, China.
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Cheng C, Han M, Xiang G, Fu X, Wang X, Lu C. Bimetallic iron-copper nanozyme for determination and degradation of norfloxacin in foods. Food Chem 2024; 444:138667. [PMID: 38335686 DOI: 10.1016/j.foodchem.2024.138667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2023] [Revised: 01/30/2024] [Accepted: 02/02/2024] [Indexed: 02/12/2024]
Abstract
Iron-copper nanozymes (Fe-Cu NZs) with good peroxidase activity were prepared through hydrothermal method by using copper nitrate as copper source, iron acetate as iron source and 2, 5-dihydroxyterephthalic acid as organic ligand. Upon oxidation of the colourless TMB to light blue products by Fe-Cu NZs, the addition of Norfloxacin (NOR) resulted in a colour change to dark blue. The absorbance of the system correlated linearly with NOR concentration in the range of 3.3 μM to 66 μM, and the detection limit (LOD) was 0.386 μM. A rapid colourimetric assay for the determination of NOR in food matrices was developed, with a detection time of only one minute. Additionally, the assay facilitated the simultaneous catalytic degradation of NOR via Fe-Cu NZs. The primary degradation mechanism of NOR was identified as the transformation of the quinolone ring and the cleavage of the C9 = C10 double bond, which was substantiated by high-performance liquid chromatography (HPLC).
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Affiliation(s)
- Cong Cheng
- College of Science, Sichuan Agricultural University, Chengdu 611130, Sichuan, China
| | - Min Han
- College of Science, Sichuan Agricultural University, Chengdu 611130, Sichuan, China
| | - Gang Xiang
- College of Agronomy, Sichuan Agricultural University, Chengdu 611130, Sichuan, China
| | - Xiaoying Fu
- Sichuan Agricultural University Library, Chengdu 611130, Sichuan, China
| | - Xianxing Wang
- College of Science, Sichuan Agricultural University, Chengdu 611130, Sichuan, China.
| | - Changfang Lu
- College of Science, Sichuan Agricultural University, Chengdu 611130, Sichuan, China.
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Gao L, Zhang Y, Chen L, Zhou Q, Zhou N, Xia X. Study of dual binding specificity of aptamer to ochratoxin A and norfloxacin and the development of fluorescent aptasensor in milk detection. Talanta 2024; 273:125935. [PMID: 38503123 DOI: 10.1016/j.talanta.2024.125935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Revised: 03/13/2024] [Accepted: 03/15/2024] [Indexed: 03/21/2024]
Abstract
Target specificity, one of aptamer characteristics that determine recognition efficiency of biosensors, is generally considered to be an intrinsic property of aptamer. However, a high-affinity aptamer may have additional target binding specificity, little is known about the specificity of aptamer binding to multiple targets, which may result in false-positive results that hinder the accuracy of detection. Herein, an aptamer OBA3 with dual target ochratoxin A (OTA) and norfloxacin (NOR) was used as an example to explore the binding specificity mechanism and developed rapid fluorescent aptasensing methods. The nucleotide 15th T of aptamer OBA3 was demonstrated to be critical for specificity and affinity binding of target OTA via site-saturation mutagenesis. Substituting the 15th T base for C base could directly improve recognition specificity of aptamer for NOR and remove the binding affinity for OTA. The combination of π-π stacking interactions, salt bridges and hydrogen bonds between loop pocket of aptamer and quinolone skeleton, piperazinyl group may contributes to the fluoroquinolone antibiotics (NOR and difloxacin)-aptamer recognition interaction. Based on this understanding, a dual-aptamer fluorescent biosensor was fabricated for simultaneous detection of OTA and NOR, which has a linear detection range of 50-6000 nM with a detection limit of 31 nM for OTA and NOR. Combined with T15C biosensor for eliminating interference of OTA, the assay was applied to milk samples with satisfactory recovery (94.06-100.93%), which can achieve detection of OTA and NOR individually within 40 min.
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Affiliation(s)
- Ling Gao
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, China
| | - Yue Zhang
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, China
| | - Lu Chen
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, China
| | - Qingtong Zhou
- School of Basic Medical Sciences, Fudan University, Shanghai, China
| | - Nandi Zhou
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, China
| | - Xiaole Xia
- The Key Laboratory of Industrial Biotechnology, Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, China.
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Chen X, Jiang Y, Liu Y, Yao C. Y 3+@CdTe quantum dot nanoprobe as a fluorescence signal enhancement sensing platform for the visualization of norfloxacin. Analyst 2023. [PMID: 37455634 DOI: 10.1039/d3an00921a] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/18/2023]
Abstract
Quinolone antibiotics (norfloxacin) pose a serious threat to animal and human health due to their misuse and difficulty in being broken down in surface water and food. Rapid and effective detection of norfloxacin (NOR) is essential for environmental testing and ecosystems. In this study, yttrium was coordinated with mercaptopropionic acid (MPA)-modified CdTe quantum dots (QDs) to obtain a novel fluorescence sensor Y3+@CdTe QDs for the sensitive detection of NOR. NOR can bind to Y3+ to form a complex (NOR-Y3+). This complex enhances the luminescence of NOR and blue-shifts to 423 nm. The fluorescence intensity of NOR-Y3+ at 423 nm (I423) gradually increased with increasing NOR concentration; meanwhile, the fluorescence intensity of CdTe QDs at 634 nm (I634) gradually decreased due to aggregation induction. The ratio of I423 to I634 was used for the quantitative determination of NOR. The linear range of the constructed fluorescent probes was from 1.0 to 150.0 μM, with a detection limit of 31.8 nM. CdTe QDs act as a red fluorescent background, and with the addition of NOR, the color of the system transitions from red to purple and finally blue. This method was rapid (immediate) and visual, providing a simple analysis of various actual samples (tap water, lake water, honey, milk and human serum) for NOR.
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Affiliation(s)
- Xiong Chen
- College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, P. R. China.
| | - Yuanhang Jiang
- College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, P. R. China.
| | - Ying Liu
- College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, P. R. China.
| | - Cheng Yao
- College of Chemistry and Molecular Engineering, Nanjing Tech University, Nanjing 211816, P. R. China.
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Devi B, Goswami M, Rabha S, Kalita S, Sarma HP, Devi A. Efficacious Sorption Capacities for Pb(II) from Contaminated Water: A Comparative Study Using Biowaste and Its Activated Carbon as Potential Adsorbents. ACS OMEGA 2023; 8:15141-15151. [PMID: 37151526 PMCID: PMC10157841 DOI: 10.1021/acsomega.3c00142] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Accepted: 04/11/2023] [Indexed: 05/09/2023]
Abstract
Heavy-metal pollution is a persevering environmental menace, which demands the necessity of its removal by green and ecofriendly adsorbents. To combat this problem, discarded plant biomass can be used as an efficient substitute. Herein, a comparative study has been highlighted for the removal of Pb2+ ions using Euryale ferox Salisbury seed coat and its activated carbon, which is prepared by a first-time-reported activating agent that is a novel and non-hazardous bioresource. The batch investigation revealed a 99.9% removal efficiency of Pb(II) by the activated carbon compared to Euryale ferox Salisbury seed coat, which shows only an 89.5% removal efficiency at neutral pH. The adsorption mechanism is mainly a multilayered process, which involves electrostatic, van der Waals, and hydrogen bonding interactions. The adsorption equilibrium, kinetic, and thermodynamic studies were examined for the biosorbents, which revealed the adsorption process to be feasible, spontaneous, and exothermic with both physisorption and chemisorption adsorption mechanisms. The desorption study asserted the reusability of both the biosorbents to a maximum of three cycles.
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Affiliation(s)
- Bhaswati Devi
- Environmental
Chemistry Laboratory, Resource Management and Environment Section,
Life Science Division, Institute of Advanced
Study in Science and Technology, Guwahati 781035, Assam, India
| | - Manisha Goswami
- Environmental
Chemistry Laboratory, Resource Management and Environment Section,
Life Science Division, Institute of Advanced
Study in Science and Technology, Guwahati 781035, Assam, India
| | - Suprakash Rabha
- Environmental
Chemistry Laboratory, Resource Management and Environment Section,
Life Science Division, Institute of Advanced
Study in Science and Technology, Guwahati 781035, Assam, India
| | - Suravi Kalita
- Environmental
Chemistry Laboratory, Resource Management and Environment Section,
Life Science Division, Institute of Advanced
Study in Science and Technology, Guwahati 781035, Assam, India
- Homi
Bhabha Centre for Science Education, Tata
Institute of Fundamental Research, Mumbai 400088, Maharashtra, India
| | - Hari Prasad Sarma
- Department
of Environmental Science, Gauhati University, Guwahati 781014, Assam, India
| | - Arundhuti Devi
- Environmental
Chemistry Laboratory, Resource Management and Environment Section,
Life Science Division, Institute of Advanced
Study in Science and Technology, Guwahati 781035, Assam, India
- . Fax: +91-361-2273062
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