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Khaleque M, Ali M, Bacchu M, Mamun M, Hossain M, Hossain M, Aly Saad Aly M, Khan M. Zinc oxide nanorod/rutin modified electrode for the detection of Thiourea in real samples. Heliyon 2023; 9:e20676. [PMID: 37860551 PMCID: PMC10582497 DOI: 10.1016/j.heliyon.2023.e20676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Revised: 09/23/2023] [Accepted: 10/04/2023] [Indexed: 10/21/2023] Open
Abstract
In this work, a novel electrochemical detection strategy was developed based on a metal-organic framework of zinc oxide nanorod nanoparticles and rutin for selective screening of Thiourea as toxic chemicals. The zinc oxide nanorod were synthesized by following direct chemical precipitation methods and characterized by X-ray diffraction and X-ray photoelectron spectroscopy analysis. The surface of modified electrodes was also characterized by field emission scanning electron microscopes, energy-dispersive X-ray spectroscopy, and attenuated total reflectance flourier transform infrared spectroscopy. Furthermore, the electrochemical activity of the developed sensor was tested by cyclic voltammetry, differential pulse voltammetry, and electrochemical impedance spectroscopy. The modified electrode showed outstanding electro-catalytic activity towards the detection of Thiourea in phosphate buffer saline at a high pH level of 12.0. The proposed sensor showed a linear range of linearity in a concentration ranging from 5.0 × 10-6 - 900 × 10-6 molL-1 and a detection limit of 2.0 × 10-6 molL-1. Moreover, the selectivity of the developed electrochemical sensor was investigated for the detection of Thiourea in the presence of organic compounds and a group of anions. Furthermore, the proposed strategy demonstrated an excellent recovery value in the spiked farmland water and fruit juice sample.
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Affiliation(s)
- M.A. Khaleque
- Dept. of Chemical Engineering, Jashore University of Science and Technology, Jashore, 7408, Bangladesh
- Laboratory of Nano-bio and Advanced Materials Engineering (NAME), Jashore University of Science and Technology, Jashore, 7408, Bangladesh
| | - M.R. Ali
- Dept. of Chemical Engineering, Jashore University of Science and Technology, Jashore, 7408, Bangladesh
- Laboratory of Nano-bio and Advanced Materials Engineering (NAME), Jashore University of Science and Technology, Jashore, 7408, Bangladesh
| | - M.S. Bacchu
- Dept. of Chemical Engineering, Jashore University of Science and Technology, Jashore, 7408, Bangladesh
- Laboratory of Nano-bio and Advanced Materials Engineering (NAME), Jashore University of Science and Technology, Jashore, 7408, Bangladesh
| | - M.R.A. Mamun
- Dept. of Chemical Engineering, Jashore University of Science and Technology, Jashore, 7408, Bangladesh
- Laboratory of Nano-bio and Advanced Materials Engineering (NAME), Jashore University of Science and Technology, Jashore, 7408, Bangladesh
| | - M.I. Hossain
- Dept. of Chemical Engineering, Jashore University of Science and Technology, Jashore, 7408, Bangladesh
- Laboratory of Nano-bio and Advanced Materials Engineering (NAME), Jashore University of Science and Technology, Jashore, 7408, Bangladesh
| | - M.S. Hossain
- Dept. of Chemical Engineering, Jashore University of Science and Technology, Jashore, 7408, Bangladesh
- Laboratory of Nano-bio and Advanced Materials Engineering (NAME), Jashore University of Science and Technology, Jashore, 7408, Bangladesh
| | - Mohamed Aly Saad Aly
- Department of Electrical and Computer Engineering at Georgia Tech Shenzhen Institute (GTSI), Tianjin University, Shenzhen, Guangdong, 518055, China
| | - M.Z.H. Khan
- Dept. of Chemical Engineering, Jashore University of Science and Technology, Jashore, 7408, Bangladesh
- Laboratory of Nano-bio and Advanced Materials Engineering (NAME), Jashore University of Science and Technology, Jashore, 7408, Bangladesh
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Tavallali H, Parhami A, Rajaei Dastghaib S, Karimi MA. A novel and simple naphthol azo dye chemosensor as a naked eye detection tool for highly selective, sensitive and accurate determination of thiourea in tap water, juices and fruit skins. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 289:122194. [PMID: 36512963 DOI: 10.1016/j.saa.2022.122194] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2022] [Revised: 11/22/2022] [Accepted: 11/26/2022] [Indexed: 06/17/2023]
Abstract
In the present study, a highly accurate and sensitive azo-dye-based colorimetric sensor based on Eriochrome Black T (EBT) was proposed to detect and determine thiourea (TU). TU is truly an important toxic and carcinogenic hazardous pollutant as approved by EPA and IARC. This chemosensor shows a distinct color change from blue to pink during interaction with TU in aqueous medium. So EBT is capable as an applied tool for naked eye detection of TU as its color change is easily observed without any means. The sensing mechanism was also investigated using UV-vis absorption and FT-IR spectra. The linear range and the detection limit of TU sensing were respectively 0.15-18.5 μmol/L and 0.02 μmol/L. In addition, the relative standard deviation (RSD) based on ten repetitions calculated for two different TU concentrations 4.4 and 9.0 μmol/L were 2.3 % and 1.8 %, respectively. Besides its useful application as a naked eye detection tool, the advantages of the developed method include simplicity, elimination of tedious separation and pre-concentration steps, executable in neutral aqueous media, low costs, high accuracy, linear response for wide range of concentrations, low detection limit, high sensitivity, compatibility, and excellent selectivity. The concentration of TU in tap water, fruit juices or fruit skin samples can be visually detected and determined easily using this method. The results showed that EBT is an ideal colorimetric chemosensor for TU, which has been reported for the first time.
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Affiliation(s)
- Hossein Tavallali
- Department of Chemistry, Payame Noor University, 19395-4697 Tehran, Islamic Republic of Iran.
| | - Abolfath Parhami
- Department of Chemistry, Payame Noor University, 19395-4697 Tehran, Islamic Republic of Iran
| | - Shiva Rajaei Dastghaib
- Department of Chemistry, Payame Noor University, 19395-4697 Tehran, Islamic Republic of Iran
| | - Mohammad Ali Karimi
- Department of Chemistry, Payame Noor University, 19395-4697 Tehran, Islamic Republic of Iran
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Inhibition to dual enzyme-like activities of Ag/CeO2 nanozymes for the detection of thiourea. Microchem J 2022. [DOI: 10.1016/j.microc.2022.108251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Zhao L, Liu J, Bai Y, Wen Y, Yang X. Exploration of nisin-directed gold nanoclusters employed for detecting thiourea and the sensing mechanism. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.129847] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Rashed MA, Ahmed J, Faisal M, Alsareii S, Jalalah M, Harraz FA. Highly sensitive and selective thiourea electrochemical sensor based on novel silver nanoparticles/chitosan nanocomposite. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.128879] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Chandrakar V, Tapadia K, Gupta SK. Greener approach for gold nanoparticles synthesis from fruit peel extract of Manilkara zapota: a fluorometric assay for determination of thiourea. INORG NANO-MET CHEM 2022. [DOI: 10.1080/24701556.2022.2081203] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/30/2022]
Affiliation(s)
- Varsha Chandrakar
- Department of Chemistry, National Institute of Technology, Raipur, India
| | - Kavita Tapadia
- Department of Chemistry, National Institute of Technology, Raipur, India
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Rahman MM, Alam MM, Alfaifi SYM, Asiri AM, Ali MM. Sensitive Detection of Thiourea Hazardous Toxin with Sandwich-Type Nafion/CuO/ZnO Nanospikes/Glassy Carbon Composite Electrodes. Polymers (Basel) 2021; 13:3998. [PMID: 34833297 PMCID: PMC8618075 DOI: 10.3390/polym13223998] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 11/04/2021] [Accepted: 11/04/2021] [Indexed: 11/16/2022] Open
Abstract
In this research study, we developed a voltammetric electrochemical sensor probe with a copolymer Nafion (Sulfonated Tetrafluoroethylene-based Fluoro-polymer) decorated with hydrothermally prepared sandwich-type CuO/ZnO nanospikes (NSs) onto a glassy carbon electrode (GCE) for reliable thiourea (TU) detection. The detailed characterizations in terms of structural morphology, binding energy, elemental compositions, grain size and crystallinity for synthesized NSs were performed by field emission scanning electron microscopy (FESEM), X-ray photoelectron spectroscopy (XPS), energy-dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD) analysis, respectively. The differential pulse voltammetric (DPV) analysis for TU showed good linearity at current-versus-TU concentration on the calibration plot in the 0.15~1.20 mM range, which is defined as a dynamic detection range (LDR) of TU in a phosphate buffer solution. Considering the slope of LDR over the GCE-coated NSs surface area (0.0316 cm2), the TU sensor sensitivity (0.4122 µA µM-1 cm-2) was obtained. Besides this, the low limit (LOD) for TU detection was calculated and found to be 23.03 ± 1.15 µM. The fabricated Nafion/CuO/ZnO NSs/GCE sensor probe was created as a reliable sensor based on reproducibility, interference effect, stability and response time. Real bio-samples were investigated and the results confirm the anticipated reliability of the TU sensor probe. Thus, this is a noble way to develop enzyme-free electrochemical sensors that could be an alternative approach for the detection of chemicals in the field of enzyme-free biosensor development technology.
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Affiliation(s)
- Mohammed M. Rahman
- Department of Chemistry, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia; (S.Y.M.A.); (A.M.A.)
- Center of Excellence for Advanced Materials Research (CEAMR), King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia;
| | - Md M. Alam
- Center of Excellence for Advanced Materials Research (CEAMR), King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia;
| | - Sulaiman Y. M. Alfaifi
- Department of Chemistry, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia; (S.Y.M.A.); (A.M.A.)
| | - Abdullah M. Asiri
- Department of Chemistry, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia; (S.Y.M.A.); (A.M.A.)
- Center of Excellence for Advanced Materials Research (CEAMR), King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia;
| | - Meser M. Ali
- Cellular and Molecular Imaging Laboratory, Department of Neurosurgery, Henry Ford Hospital, Detroit, MI 48202, USA;
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Motoc Ilies S, Schinteie B, Pop A, Negrea S, Cretu C, Szerb EI, Manea F. Graphene Quantum Dots and Cu(I) Liquid Crystal for Advanced Electrochemical Detection of Doxorubicine in Aqueous Solutions. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:2788. [PMID: 34835559 PMCID: PMC8625772 DOI: 10.3390/nano11112788] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Revised: 10/16/2021] [Accepted: 10/20/2021] [Indexed: 01/10/2023]
Abstract
Two paste electrodes based on graphene quantum dots and carbon nanotubes (GRQD/CNT) and one modified with a homoleptic liquid crystalline Cu(I) based coordination complex (Cu/GRQD/CNT) were obtained and morphostructurally and electrochemically characterized in comparison with simple CNT electrode (CNT) for doxorubicine (DOX) detection in aqueous solutions. GRQD/CNT showed the best electroanalytical performance by differential pulse voltammetry technique (DPV). Moreover, applying a preconcentration step prior to detection stage, the lowest limit of detection (1 ng/L) and the highest sensitivity (216,105 µA/mg·L-1) in comparison with reported literature data were obtained. Cu/GRQD/CNT showed good results using multiple pulse amperometry technique (MPA) and a favorable shifting of the potential detection to mitigate potential interferences. Both GRQD-based paste electrodes have a great potential for practical utility in DOX determination in water at trace concentration levels, using GRQD/CNT with DPV and in pharmaceuticals formulations using Cu/GRQD/CNT with MPA.
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Affiliation(s)
- Sorina Motoc Ilies
- “Coriolan Drăgulescu” Institute of Chemistry, Romanian Academy, 24 Mihai Viteazu Bvd., 300223 Timisoara, Romania; (S.M.I.); (B.S.); (C.C.)
| | - Bianca Schinteie
- “Coriolan Drăgulescu” Institute of Chemistry, Romanian Academy, 24 Mihai Viteazu Bvd., 300223 Timisoara, Romania; (S.M.I.); (B.S.); (C.C.)
| | - Aniela Pop
- Department of Applied Chemistry and Engineering of Inorganic Compounds and Environment, Politehnica University of Timisoara, 2 Victoriei Square, 300006 Timisoara, Romania;
| | - Sorina Negrea
- National Institute of Research and Development for Industrial Ecology (INCD ECOIND), Timisoara Branch, 300431 Timisoara, Romania;
- Department of Environmental Engineering and Management, “Gheorghe Asachi” Technical University of Iasi, 700050 Iasi, Romania
| | - Carmen Cretu
- “Coriolan Drăgulescu” Institute of Chemistry, Romanian Academy, 24 Mihai Viteazu Bvd., 300223 Timisoara, Romania; (S.M.I.); (B.S.); (C.C.)
| | - Elisabeta I. Szerb
- “Coriolan Drăgulescu” Institute of Chemistry, Romanian Academy, 24 Mihai Viteazu Bvd., 300223 Timisoara, Romania; (S.M.I.); (B.S.); (C.C.)
| | - Florica Manea
- Department of Applied Chemistry and Engineering of Inorganic Compounds and Environment, Politehnica University of Timisoara, 2 Victoriei Square, 300006 Timisoara, Romania;
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Zhao Y, Fu Q, Cui X, Chi H, Lu Y, Liu X, Yu M, Fei Q, Feng G, Shan H, Huan Y. A colorimetric sensor for detecting thiourea based on inhibiting peroxidase-like activity of gold-platinum nanoparticles. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2021; 13:1069-1074. [PMID: 33576364 DOI: 10.1039/d0ay02283g] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
In this study, gold-platinum nanoparticles (Au@PtNPs) with peroxidase-like activity were synthesized. In the absence of thiourea (TU), the Au@PtNPs can catalyze the decomposition of hydrogen peroxide, and oxidize 3,3',5,5'-tetramethylbenzidine dihydrochloride (TMB, colorless) into oxidized 3,3',5,5'-tetramethylbenzidine dihydrochloride (oxTMB, blue). The peroxidase-like activity of the Au@PtNPs is inhibited in the presence of TU, and TMB cannot be oxidized to oxTMB effectively, and no blue color could be observed. Based on this finding, a novel colorimetric sensor for detecting TU is proposed. The absorbance response curve showed a good linearity for the concentration of TU in the range of 10 nmol L-1 to 10 μmol L-1 with a correlation coefficient of R2 = 0.999, and the limit of detection is 9.57 nmol L-1. The colorimetric sensor possesses excellent selectivity, anti-interference ability, and application value in actual samples.
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Affiliation(s)
- Yuqi Zhao
- College of Chemistry, Jilin University, Changchun 130023, People's Republic of China.
| | - Qingjie Fu
- College of Chemistry, Jilin University, Changchun 130023, People's Republic of China.
| | - Xiaoqian Cui
- Department of Emergency and Critical Care, The Second Hospital of Jilin University, Changchun 130041, People's Republic of China
| | - Hui Chi
- College of Chemistry, Jilin University, Changchun 130023, People's Republic of China.
| | - Yongzhuang Lu
- College of Chemistry, Jilin University, Changchun 130023, People's Republic of China.
| | - Xiaoli Liu
- College of Chemistry, Jilin University, Changchun 130023, People's Republic of China.
| | - Miao Yu
- College of Chemistry, Jilin University, Changchun 130023, People's Republic of China.
| | - Qiang Fei
- College of Chemistry, Jilin University, Changchun 130023, People's Republic of China.
| | - Guodong Feng
- College of Chemistry, Jilin University, Changchun 130023, People's Republic of China.
| | - Hongyan Shan
- College of Chemistry, Jilin University, Changchun 130023, People's Republic of China.
| | - Yanfu Huan
- College of Chemistry, Jilin University, Changchun 130023, People's Republic of China.
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Size-modulated optical property of gold nanorods for sensitive and colorimetric detection of thiourea in fruit juice. Talanta 2020; 225:121965. [PMID: 33592719 DOI: 10.1016/j.talanta.2020.121965] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2020] [Revised: 11/12/2020] [Accepted: 11/30/2020] [Indexed: 02/06/2023]
Abstract
As an important sulfur compound, thiourea (TU) has caused great concern because of its wide application as well as its serious toxicity and hazard to the environment. Thus, it is necessary to develop a sensitive and selective method for TU analysis. In this work, gold nanorods (AuNRs) acted as an optical probe to realize the sensitive and colorimetric detection of TU. In HCl medium, Fe3+ at low concentration was difficult to oxide Au0 to form Au+ because of the high redox potential or the positive Gibbs free energy change. However, this process was possible when TU was present since the association constant between Au+ and TU is great enough to bind with TU to form a stable complex to further promote the etching of AuNRs, resulting in the lower aspect ratio of AuNRs with the blue shift and intensity decrease in extinction spectra, accompanied by the divisive colors of AuNRs solution or colorful dark-field light scattering imaging of single AuNR. The blue-shift of AuNRs longitudinal plasmon resonance absorption (LPRA) band was proportional to the concentration of TU in the range of 1-250 nM and the limit of detection (3σ/k) was as low as 0.4 nM. In addition, the colorimetric method was proven with high selectivity in the presence of potential interfering compounds, which was successfully applied to the detection of TU in fruit juice samples. This proposed colorimetric method provides a simple, sensitive yet selective measurement tool for TU sensing, which may offer new opportunities in the development of colorimetric sensors for food safety in the future.
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Fabrication of a sensitive electrochemical sensor based on Ag nanoparticles and alizarin yellow polymer: Application to the detection of an environmental pollutant thiourea. KOREAN J CHEM ENG 2020. [DOI: 10.1007/s11814-020-0561-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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12
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Zhang C, Wu S, Yu Y, Chen F. Determination of thiourea based on the reversion of fluorescence quenching of nitrogen doped carbon dots by Hg 2. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2020; 227:117666. [PMID: 31670045 DOI: 10.1016/j.saa.2019.117666] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Revised: 10/15/2019] [Accepted: 10/15/2019] [Indexed: 06/10/2023]
Abstract
Herein, a facile and quick strategy to detect thiourea was conducted based on the reversion of fluorescence quenching of nitrogen doped carbon dots (NCDs) by Hg2+. The NCDs with good water solubility and 17% of quantum yield was synthesized by one-step hydrothermal method, using ammonium citrate and dextrin as carbon source and nitrogen source, respectively. The fluorescence of NCDs was obviously quenched by Hg2+ and can be recovered, due to stronger interaction between thiourea and Hg2+. There was a good linear relationship between the recovered fluorescence and the concentration of thiourea within range of 0.90-10.0 μM and the detection limit for thiourea detection was 0.15 μM. The as-prepared NCDs can be used for determination of thiourea in tap water, lake water and rice flour products, and the spike recoveries were between 91.6 and 108%.
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Affiliation(s)
- Cengceng Zhang
- Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica, Key laboratory of Material Chemistry for Energy Conversion and Storage (HUST), Ministry of Education, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, 430074, Wuhan, China
| | - Shu Wu
- Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica, Key laboratory of Material Chemistry for Energy Conversion and Storage (HUST), Ministry of Education, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, 430074, Wuhan, China
| | - Yuanyuan Yu
- Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica, Key laboratory of Material Chemistry for Energy Conversion and Storage (HUST), Ministry of Education, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, 430074, Wuhan, China
| | - Fang Chen
- Hubei Key Laboratory of Bioinorganic Chemistry & Materia Medica, Key laboratory of Material Chemistry for Energy Conversion and Storage (HUST), Ministry of Education, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, 430074, Wuhan, China.
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Xu Y, Dai Y, Li C, Zhang H, Guo M, Yang Y. PC software-based portable cyclic voltammetry system with PB-MCNT-GNPs-modified electrodes for E. coli detection. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2020; 91:014103. [PMID: 32012638 DOI: 10.1063/1.5113655] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Accepted: 12/19/2019] [Indexed: 06/10/2023]
Abstract
PC software-based portable cyclic voltammetry (PCV) systems have the advantages of portability, high performance, and real-time detection. In this paper, the PCV system used cyclic voltammetry (CV) as the main detection and analysis method and contained the following components: a three-electrode unit, a portable potentiostat, and PC software. The PC software was used as the system control and display, and a dynamic peak position adjustment (DPPA) algorithm for E. coli measurements based on thick biofilm modification on electrodes was designed especially for this system to realize the real-time correspondence between the measured results and the modified electrodes. The performance test results obtained by setting different detection parameters in the PCV system were compared with those of commercial electrochemical workstations. The difference was less than 4.99%, with a relative standard deviation less than 0.20%. An electrochemical biosensor based on a Prussian blue-multiwalled carbon nanotube-gold nanoparticle composite was developed for E. coli detection. After constructing an antibody-BSA-E. coli electrode modification on the sensor, experimental data processed by the DPPA algorithm showed that the logarithm (lg DfE.coli) of the E. coli dilution factor and the peak current response had a linear relationship. The PCV system could quickly and accurately detect E. coli concentrations with dynamic adjustment algorithms for biofilm-modified electrodes. Furthermore, the system could detect the electrochemical activities of various high-sensitivity biomolecules, showing great detection potential for on-site monitoring and meeting the requirements of real-time and portable detection in various food safety fields.
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Affiliation(s)
- Ying Xu
- College of Automation, Hangzhou Dianzi University, Xiasha Higher Education Zone, Hangzhou 310018, Zhejiang Province, China
| | - Yan Dai
- College of Automation, Hangzhou Dianzi University, Xiasha Higher Education Zone, Hangzhou 310018, Zhejiang Province, China
| | - Chao Li
- College of Automation, Hangzhou Dianzi University, Xiasha Higher Education Zone, Hangzhou 310018, Zhejiang Province, China
| | - Haijing Zhang
- College of Automation, Hangzhou Dianzi University, Xiasha Higher Education Zone, Hangzhou 310018, Zhejiang Province, China
| | - Miao Guo
- College of Automation, Hangzhou Dianzi University, Xiasha Higher Education Zone, Hangzhou 310018, Zhejiang Province, China
| | - Yong Yang
- College of Automation, Hangzhou Dianzi University, Xiasha Higher Education Zone, Hangzhou 310018, Zhejiang Province, China
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Cu(I) Coordination Complex Precursor for Randomized CuO x Microarray Loaded on Carbon Nanofiber with Excellent Electrocatalytic Performance for Electrochemical Glucose Detection. SENSORS 2019; 19:s19245353. [PMID: 31817245 PMCID: PMC6960723 DOI: 10.3390/s19245353] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Revised: 11/29/2019] [Accepted: 12/01/2019] [Indexed: 12/21/2022]
Abstract
A homoleptic ionic Cu(I) coordination complex that was based on 2,2′-biquinoline ligand functionalized with long alkyl chains (Cu(I)–C18) was used as a precursor to modify a carbon nanofiber paste electrode (Cu–C18/CNF). Randomized copper oxide microelectrode arrays dispersed within carbon nanofiber paste (CuOx/CNF) were obtained by electrochemical treatment of Cu–C18/CNF while using cyclic voltammetry (CV). The CuOx/CNF exhibited high electrocatalytic activity towards glucose oxidation at +0.6 V and +1.2 V vs. Ag/AgCl. Infrared Spectroscopy (FTIR) and scanning electron microscopy (SEM) characterized the electrodes composition. Cyclic voltammetry (CV), square wave-voltammetry (SWV), and multiple-pulsed amperometry (MPA) techniques provided optimized conditions for glucose oxidation and detection. A preconcentration step that involved 10 minutes accumulation at open circuit potential before SWV running led to the lowest limit of detection and the highest sensitivity for glucose detection (5419.77 µA·mM−1·cm−2 at + 1.1 V vs. Ag/AgCl) vs. Cu-based electrodes reported to date in literature.
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Fan X, Fan Z. Determination of Thiourea by On–Off Fluorescence Using Nitrogen-Doped Graphene Quantum Dots. ANAL LETT 2019. [DOI: 10.1080/00032719.2019.1590844] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Xiaoxia Fan
- Department of Chemistry, Shanxi Normal University, Linfen, China
| | - Zhefeng Fan
- Department of Chemistry, Shanxi Normal University, Linfen, China
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Garcia PT, Dias AA, Souza JAC, Coltro WKT. Batch injection analysis towards auxiliary diagnosis of periodontal diseases based on indirect amperometric detection of salivary α-amylase on a cupric oxide electrode. Anal Chim Acta 2018; 1041:50-57. [PMID: 30340690 DOI: 10.1016/j.aca.2018.08.039] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2018] [Revised: 06/19/2018] [Accepted: 08/21/2018] [Indexed: 02/05/2023]
Abstract
This study describes, for the first time, the use of a batch injection analysis system with amperometric detection (BIA-AD) to indirectly determine salivary α-amylase (sAA) levels in saliva samples for chronic periodontitis diagnosis. A chemical/thermal treatment was explored to generate a CuO film on a Cu electrode surface. This procedure offered good stability (RSD = 0.3%), good repeatability (RSD < 1.3%) and excellent reproducibility (RSD < 1.5%). The sAA concentration levels were determined based on the detection of maltose produced by enzymatic hydrolysis of starch. The analytical performance was investigated, and a linear correlation was observed for a maltose concentration range between 0.5 and 6.0 mmol L-1 with a correlation coefficient equal to 0.999. The analytical sensitivity and the limit of detection were 48.8 μA/(mmol L-1) and 0.05 mmol L-1, respectively. In addition, the proposed system provided an excellent analytical frequency (120 analysis h-1). The clinical feasibility of the proposed method was investigated by the determination of sAA levels in four saliva samples (two from healthy control persons (C1 and C2) and two from patients with chronic periodontitis (P1 and P2)). The accuracy provided by the BIA-AD system ranged from 93 to 98%. The sAA concentration levels achieved for each sample were compared to the values found by spectrophotometry and there was no statistically significant difference between them at a confidence level of 95%. Finally, the method reported herein emerges as a simple, low cost and promising tool for assisting periodontal diseases diagnosis.
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Affiliation(s)
- Paulo T Garcia
- Instituto de Química, Universidade Federal de Goiás, 74690-900, Goiânia, GO, Brazil
| | - Anderson A Dias
- Instituto de Química, Universidade Federal de Goiás, 74690-900, Goiânia, GO, Brazil
| | - João A C Souza
- Faculdade de Odontologia, Universidade Federal de Goiás, 74605-220, Goiânia, GO, Brazil
| | - Wendell K T Coltro
- Instituto de Química, Universidade Federal de Goiás, 74690-900, Goiânia, GO, Brazil; Instituto Nacional de Ciência e Tecnologia de Bioanalítica, 13084-971, Campinas, SP, Brazil.
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17
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Maleki A, Daraei H, Amini N. Electrocatalytic activity of manganese oxide nanosphere immobilized onto deoxyribonucleic acid modified electrode: Application to determine environmental pollutant thiourea at natural pH. J Colloid Interface Sci 2017; 504:579-585. [DOI: 10.1016/j.jcis.2017.06.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Revised: 06/03/2017] [Accepted: 06/06/2017] [Indexed: 11/28/2022]
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18
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Rahman MM, Ahmed J, Asiri AM. Thiourea sensor development based on hydrothermally prepared CMO nanoparticles for environmental safety. Biosens Bioelectron 2017; 99:586-592. [PMID: 28826003 DOI: 10.1016/j.bios.2017.08.039] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Revised: 08/05/2017] [Accepted: 08/16/2017] [Indexed: 11/18/2022]
Abstract
Low-dimensional cobalt oxide codoped manganese oxide nanoparticles (CMO NPs; dia. ~ 25.6nm) were synthesized using the hydrothermal method in alkaline phase. The optical, morphological, and structural properties of CMO NPs were characterized in details using FT-IR, UV/vis., FESEM, XEDS, XPS, TEM, and XRD techniques. Glassy carbon electrode (GCE) was fabricated with a thin-layer of CMO NPs by conducting coating binders for the development of selective and sensitive thiourea (TU) sensors. Electrochemical responses along with higher sensitivity, large-dynamic-range, and long-term stability towards TU were performed by electrochemical I-V approach. The calibration curve was found linear over a wide linear dynamic range (LDR) of TU concentration. From the gradient of the calibration plot, limit of detection (LOD), and sensitivity were calculated as 12.0±0.05pM and 3.3772nAnM-1cm-2 respectively. It is an organized route for the development of chemical sensor based on very low-dimensional CMO NPs/GCE using electrochemical reduction phenomena. As far as we know, this report is the maiden publication on highly sensitive TU sensor based on the CMO NPs/GCE. This method could be a pioneer developer in TU sensitive chemical sensor development using doped NPs in the simple I-V method for the important sensor applications with useful doped materials coupled nano-technological systems for environmental safety.
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Affiliation(s)
- Mohammed M Rahman
- Center of Excellence for Advanced Materials Research (CEAMR), King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia; Chemistry Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia.
| | - Jahir Ahmed
- Department of Chemistry, School of Physical Sciences, Shahjalal University of Science and Technology, Sylhet 3100, Bangladesh
| | - Abdullah M Asiri
- Center of Excellence for Advanced Materials Research (CEAMR), King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia; Chemistry Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia
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19
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Chen C, Zhao D, Sun J, Yang X. A dual-mode signaling response of a AuNP-fluorescein based probe for specific detection of thiourea. Analyst 2016; 141:2581-7. [DOI: 10.1039/c6an00165c] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
By employing fluorescein and AuNPs as energy donors and acceptors, respectively, a novel fluorescence resonance energy transfer (FRET)-based dual-mode sensor for selective recognition and quantitative detection of thiourea was designed and constructed in this study for the first time.
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Affiliation(s)
- Chuanxia Chen
- State Key Laboratory of Electroanalytical Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun
- China
| | - Dan Zhao
- State Key Laboratory of Electroanalytical Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun
- China
| | - Jian Sun
- State Key Laboratory of Electroanalytical Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun
- China
| | - Xiurong Yang
- State Key Laboratory of Electroanalytical Chemistry
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun
- China
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20
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Wang X, Yang C, Yan M, Ge S, Yu J. A novel fluorescence probe based on p-acid-Br and its application in thiourea detection. RSC Adv 2016. [DOI: 10.1039/c6ra06953c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A novel organic fluorescence system was developed to detect thiourea based on p-acid-Br, which in the range of 0.5–1000 nM and with a detection limit of 0.26 nM. And this method provides a new promising platform for clinical analysis.
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Affiliation(s)
- Xiu Wang
- School of Chemistry and Chemical Engineering
- University of Jinan
- Jinan 250022
- P. R. China
| | - Chunlei Yang
- School of Chemistry and Chemical Engineering
- University of Jinan
- Jinan 250022
- P. R. China
| | - Mei Yan
- School of Chemistry and Chemical Engineering
- University of Jinan
- Jinan 250022
- P. R. China
| | - Shenguang Ge
- Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials
- University of Jinan
- Jinan 250022
- P. R. China
| | - Jinghua Yu
- School of Chemistry and Chemical Engineering
- University of Jinan
- Jinan 250022
- P. R. China
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21
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Rohani Moghadam M, Akbarzadeh S, Nasirizadeh N. Electrochemical sensor for the determination of thiourea using a glassy carbon electrode modified with a self-assembled monolayer of an oxadiazole derivative and with silver nanoparticles. Mikrochim Acta 2015. [DOI: 10.1007/s00604-015-1723-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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22
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Mozaffari S, Amoli HS, Simorgh S, Rahmanian R. Impedimetric Thiourea Sensing in Copper Electrorefining Bath based on DC Magnetron Sputtered Nanosilver as Highly Uniform Transducer. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2015.10.076] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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23
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Arab Chamjangali M, Goudarzi N, Ghochani Moghadam A, Amin AH. An on-line spectrophotometric determination of trace amounts of thiourea in tap water, orange juice, and orange peel samples using multi-channel flow injection analysis. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 149:580-587. [PMID: 25985122 DOI: 10.1016/j.saa.2015.04.110] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2014] [Revised: 02/04/2015] [Accepted: 04/29/2015] [Indexed: 06/04/2023]
Abstract
In this work, a flow injection analysis (FIA) method was introduced for the determination of trace amounts of thiourea in tap water. This method is based upon the inhibition effect of thiourea on the reaction between meta-cresol purple (MCP) and potassium bromate catalyzed by bromide ions in a sulfuric acid medium. In the presence of thiourea, an induction period appears in the reaction system, and as a result, the absorbance of MCP increases at 525 nm in the FIA manifold. The chemical and FIA variables are studied and optimized using the univariate and Simplex optimization methods. Under the optimum conditions, thiourea can be determined in the range of 0.100-13.0 μg mL(-1). The limit of detection (3σ) for thiourea was found to be 0.0310 μg mL(-1). The relative standard deviations (RSDs) for six replicate determinations of 0.500, 5.00, and 12.0 μg mL(-1) of thiourea were 4.0%, 1.8%, and 1.2%, respectively. The proposed method was also applied for the determination of thiourea in orange juice and orange peel samples with recoveries in the range of 98.0-101%. The analytical speed of the method was calculated to be about 120 sample per hour.
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Affiliation(s)
- M Arab Chamjangali
- Department of Chemistry, Shahrood University, Shahrood, P.O. Box 36155-316, Iran.
| | - N Goudarzi
- Department of Chemistry, Shahrood University, Shahrood, P.O. Box 36155-316, Iran
| | - A Ghochani Moghadam
- Department of Chemistry, Shahrood University, Shahrood, P.O. Box 36155-316, Iran
| | - A H Amin
- Department of Chemistry, Shahrood University, Shahrood, P.O. Box 36155-316, Iran
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24
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Tashdjian A, Sánchez Loredo MG, González GA. Preparation of Silver Nanoparticles-Based Sensors for the Electrochemical Detection of Thiourea in Leaching Solutions of Waste Electrical and Electronic Equipment. ELECTROANAL 2013. [DOI: 10.1002/elan.201300242] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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25
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Hydrogen peroxide sensor based on riboflavin immobilized at the nickel oxide nanoparticle-modified glassy carbon electrode. J APPL ELECTROCHEM 2013. [DOI: 10.1007/s10800-013-0603-9] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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26
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Tian L, Gao Y, Li L, Wu W, Sun D, Lu J, Li T. Determination of thiourea using a carbon paste electrode decorated with copper oxide nanoparticles. Mikrochim Acta 2013. [DOI: 10.1007/s00604-013-0970-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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27
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Ftahy MM, Latif NSA, Alalkamy EF, El-Batrawi FA, Galal AH, Khatab HM. Antifibrotic potential of a selective COX-2 inhibitor (celecoxib) on liver fibrosis in rats. ACTA ACUST UNITED AC 2012. [DOI: 10.1007/s00580-012-1427-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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28
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Abbasi S, Khodarahmiyan K, Farmany A. Ultra Sensitive Quantification of Thiourea at Nanomolar Level by Catalytic-Kinetic Differential Pulse Voltammetry. ELECTROANAL 2011. [DOI: 10.1002/elan.201100111] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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29
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Salimi A, Hallaj R. Cobalt oxide nanostructure-modified glassy carbon electrode as a highly sensitive flow injection amperometric sensor for the picomolar detection of insulin. J Solid State Electrochem 2011. [DOI: 10.1007/s10008-011-1510-9] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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30
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Al-Attar AM. Hepatoprotective Influence of Vitamin C on Thioacetamide-induced Liver Cirrhosis in Wistar Male Rats. ACTA ACUST UNITED AC 2011. [DOI: 10.3923/jpt.2011.218.233] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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31
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Jing Z, Lin X. Electrocatalytic Oxidation of Formaldehyde on Copper Oxide Nano-crystalline Modified Glassy Carbon Electrode. CHINESE J CHEM 2011. [DOI: 10.1002/cjoc.201190004] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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32
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CuO Crystalline Modified Glassy Carbon Electrodes for Anodic Amperometric Determination of Hydrogen Peroxide. CHINESE J CHEM 2011. [DOI: 10.1002/cjoc.201190029] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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33
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Wang GL, Dong YM, Zhu XY, Zhang WJ, Wang C, Jiao HJ. Ultrasensitive and selective colorimetric detection of thiourea using silver nanoprobes. Analyst 2011; 136:5256-60. [DOI: 10.1039/c1an15613f] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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34
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Levent A, Keskin E, Yardım Y, Şentürk Z. Electrooxidation of thiourea and its square-wave voltammetric determination using pencil graphite electrode. REVIEWS IN ANALYTICAL CHEMISTRY 2011; 30. [DOI: https:/doi.org/10.1515/revac.2011.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/01/2024]
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35
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Manea F, Ihos M, Remes A, Burtica G, Schoonman J. Electrochemical Determination of Diclofenac Sodium in Aqueous Solution on Cu-Doped Zeolite-Expanded Graphite-Epoxy Electrode. ELECTROANAL 2010. [DOI: 10.1002/elan.201000074] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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36
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Abbasi S, Khani H, Hosseinzadeh L, Safari Z. Determination of thiourea in fruit juice by a kinetic spectrophotometric method. JOURNAL OF HAZARDOUS MATERIALS 2010; 174:257-262. [PMID: 19811871 DOI: 10.1016/j.jhazmat.2009.09.045] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2009] [Revised: 09/06/2009] [Accepted: 09/10/2009] [Indexed: 05/28/2023]
Abstract
A catalytic kinetic method is described for determination of trace levels of thiourea based on its catalytic effect on the oxidation of Janus green (JG) by potassium iodate in hydrochloric acid media. The reaction was monitored by measuring the decrease in absorbance of the dye at 610 nm after 25 min. The effect of some factors on the reaction speed was investigated. The developed method allowed the determination of thiourea in range of 0.01-12.00 mg L(-1) with good precision, accuracy and the detection limit was 0.008 mg L(-1). Most of foreign species do not interfere with the determination. The method was found to be sensitive, selective and was applied to the determination of thiourea in fruit juices and orange peel.
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37
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Noorbakhsh A, Salimi A. Amperometric detection of hydrogen peroxide at nano-nickel oxide/thionine and celestine blue nanocomposite-modified glassy carbon electrodes. Electrochim Acta 2009. [DOI: 10.1016/j.electacta.2009.05.078] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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38
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Abbasi S, Khani H, Gholivand MB, Naghipour A, Farmany A, Abbasi F. A kinetic method for the determination of thiourea by its catalytic effect in micellar media. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2009; 72:327-331. [PMID: 19062331 DOI: 10.1016/j.saa.2008.09.029] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2008] [Revised: 09/06/2008] [Accepted: 09/26/2008] [Indexed: 05/27/2023]
Abstract
A highly sensitive, selective and simple kinetic method was developed for the determination of trace levels of thiourea based on its catalytic effect on the oxidation of janus green in phosphoric acid media and presence of Triton X-100 surfactant without any separation and pre-concentration steps. The reaction was monitored spectrophotometrically by tracing the formation of the green-colored oxidized product of janus green at 617 nm within 15 min of mixing the reagents. The effect of some factors on the reaction speed was investigated. Following the recommended procedure, thiourea could be determined with linear calibration graph in 0.03-10.00 microg/ml range. The detection limit of the proposed method is 0.02 microg/ml. Most of foreign species do not interfere with the determination. The high sensitivity and selectivity of the proposed method allowed its successful application to fruit juice and industrial waste water.
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39
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Cinghită D, Radovan C, Dascălu D. Anodic Voltammetry of Thioacetamide and its Amperometric Determination in Aqueous Media. SENSORS 2008; 8:4560-4581. [PMID: 27873773 PMCID: PMC3705459 DOI: 10.3390/s8084560] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/17/2008] [Revised: 07/30/2008] [Accepted: 07/31/2008] [Indexed: 11/16/2022]
Abstract
TAA is a harmful, presumptive pollutant in tap waters and waste waters. Several alternatives have been tested as new possibilities for the anodic determination of TAA in aqueous solutions, simulated waste waters and tap water. The electrochemical behaviour of thioacetamide (TAA) was investigated at a boron-doped diamond (BDD) electrode both in unbuffered 0.1 M Na₂SO₄ and buffered solutions as supporting electrolytes. The anodic oxidation of TAA showed well-defined limiting currents or current peaks and a good linearity of the amperometric signal vs. concentration plots. The analytical parameters of sensitivity, RSD and LOD, obtained under various experimental conditions, suggest the suitability of the BDD electrode for electroanalytical purposes. Low fouling effects, good reproducibility and stability, as well as the sharpness of the amperometric signals in both unbuffered/ buffered acidic or neutral media, highly superior to those obtained using a glassy carbon (GC) electrode, recommend the unmodified BDD electrode as a promising potential amperometric sensor for environmental applications, regarding the direct anodic determination of TAA in aqueous media.
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Affiliation(s)
- Dan Cinghită
- West University of Timisoara, Laboratory of Electrochemistry, Str. Pestalozzi Nr. 16, 300115, Timisoara, Romania.
| | - Ciprian Radovan
- West University of Timisoara, Laboratory of Electrochemistry, Str. Pestalozzi Nr. 16, 300115, Timisoara, Romania.
| | - Daniela Dascălu
- West University of Timisoara, Laboratory of Electrochemistry, Str. Pestalozzi Nr. 16, 300115, Timisoara, Romania
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40
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Corb I, Manea F, Radovan C, Pop A, Burtica G, Malchev P, Picken S, Schoonman J. Carbon-based Composite Electrodes: Preparation, Characterization and Application in Electroanalysis. SENSORS 2007; 7:2626-2635. [PMID: 28903250 PMCID: PMC3965232 DOI: 10.3390/s7112626] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/02/2007] [Accepted: 11/05/2007] [Indexed: 11/16/2022]
Abstract
Electrodes based on carbon, i.e., expanded graphite (20%, wt.)-epoxy composite (20EG-Epoxy) and expanded graphite (20%, wt.)-polystyrene composite (20EG-PS) have been prepared, characterized using scanning electron microscopy (SEM) and cyclic voltammetry (CV), and tested as anodic sensors. The electrodes exhibited good mechanical resistance and low electrical resistances. Scan rate dependent cyclic voltammetry responses at 20EG-Epoxy and 20EG-PS composite electrodes, which were exemplified for thiourea (TU), a toxic sulphur organic compound selected as testing target analyte in 0.1 M Na2SO4 supporting electrolyte, were investigated. The obtained voltammetric data were in accordance with those for a random array of microelectrodes. The voltammetric and chronoamperometric detection results of TU in tap water samples, without a supplementary addition of supporting electrolyte, at 20EG-Epoxy electrode proved its use for direct analysis of environmental samples.
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Affiliation(s)
- Ioana Corb
- "Politehnica" University of Timisoara, P-ta Victoriei, nr.2, 300006, Timisoara, Romania.
| | - Florica Manea
- "Politehnica" University of Timisoara, P-ta Victoriei, nr.2, 300006, Timisoara, Romania.
| | - Ciprian Radovan
- West University of Timisoara, Str. Pestalozzi, Nr.16, 300115, Romania.
| | - Aniela Pop
- "Politehnica" University of Timisoara, P-ta Victoriei, nr.2, 300006, Timisoara, Romania.
| | - Georgeta Burtica
- "Politehnica" University of Timisoara, P-ta Victoriei, nr.2, 300006, Timisoara, Romania.
| | - Plamen Malchev
- Delft University of Technology, 2600 GA Delft, The Netherlands.
| | - Stephen Picken
- Delft University of Technology, 2600 GA Delft, The Netherlands.
| | - Joop Schoonman
- Delft University of Technology, 2600 GA Delft, The Netherlands.
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