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Cai B, Ren T, Yu X, Lv W, Liang Y. Aptamer-functionalized gold nanoparticles for mercury ion detection in a colorimetric assay based on color change time as signal readout. Mikrochim Acta 2024; 191:74. [PMID: 38170341 DOI: 10.1007/s00604-023-06142-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2023] [Accepted: 12/08/2023] [Indexed: 01/05/2024]
Abstract
A universal strategy for a rapid colorimetric method for Hg2+ in an aqueous solution is described. The specific binding of Hg2+ (thymine-Hg2+-thymine) with thiolated DNA-functionalized gold nanoparticles (AuNPs) via Au-S bonds increases the spatial hindrance of the AuNP surface, resulting in a weakened catalytic ability of AuNPs to catalyze the reaction between p-nitrophenol and NaBH4. Therefore, the color change time (CCT) of the solution from yellow to colorless becomes longer. Based on the kinetic curve of absorbance over time measured by a UV spectrometer, the level of Hg2+ in aqueous solutions can be easily quantified. A linear relationship between CCT and Hg2+ concentration was obtained in the 10-600-nM range with a detection limit of 0.20 nM, which is much lower than the limit value (10 nM) defined by the US Environmental Protection Agency for Hg2+ in drinking water. The excellent sensitivity comes from CCT as the signal output of the probe, rather than the absorbance or wavelength change used in traditional colorimetric probes as the signal output.
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Affiliation(s)
- Bin Cai
- Ministry of Ecology and Environment, South China Institute of Environmental Science, Guangzhou, 510655, China
| | - Tingyan Ren
- Ministry of Ecology and Environment, South China Institute of Environmental Science, Guangzhou, 510655, China
| | - Xiaowei Yu
- Ministry of Ecology and Environment, South China Institute of Environmental Science, Guangzhou, 510655, China
| | - Wendong Lv
- Institute of Resources Utilization and Rare Earth Development, Guangdong Academy of Sciences, Guangzhou, 510650, China.
| | - Yong Liang
- School of Chemistry, South China Normal University, Guangzhou, 510631, China.
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Kaur R, Rana S, Kaur R, Jyoti, Kaur N, Singh B. Bio-mimetic selectivity in Hg 2+ sensing developed via electro-copolymerized PEDOT and benzothiazole-Au nanoparticles composite. Mikrochim Acta 2023; 190:396. [PMID: 37715841 DOI: 10.1007/s00604-023-05972-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2023] [Accepted: 08/27/2023] [Indexed: 09/18/2023]
Abstract
To eliminate the potential health risks of mercury, development of stable and selective mercury sensor with high sensitivity is the need of the hour. To address this, a novel PEDOT-AA-BTZ-Au-based Hg2+ selective, hybrid electrochemical sensor has been designed by following a simple protocol for electrode fabrication. The electrode was designed by carefully optimizing the onset oxidation potential of supramolecule 2-(anthracen-9-yl)benzo[d]thiazole (AA-BTZ) and conducting polymer poly-(3,4-ethylenedioxythiophene) (PEDOT), using copolymerization approach followed by dropcasting of gold nanoparticles (AuNPs). The designed electrode offered synergistic effects thus augmenting the electrical conductivity and adsorption capacity as depicted by its porous surface morphology. The highly sensitive analytical signal was generated by sulphur pockets present in AA-BTZ and PEDOT conducting framework. This is further complemented by the selectivity offered by the soft interactions between AuNPs and Hg2+ resulting in a low detection limit of 0.60 nM. The prepared system was further utilized for sensing Hg2+ ion in real systems including lake water and cosmetic samples. Low interference from other ions and better reproducibility further established the suitability of the designed transducer system for future on-site sensing.
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Affiliation(s)
- Randeep Kaur
- Department of Chemistry, Panjab Univeristy, Chandigarh, 160014, India
| | - Shweta Rana
- Department of Chemistry, Panjab Univeristy, Chandigarh, 160014, India.
| | - Ranjeet Kaur
- Department of Chemistry, Panjab Univeristy, Chandigarh, 160014, India
- University Centre for Research & Development (UCRD), Department of Chemistry, Chandigarh University, Gharuan, Mohali, Punjab, 140413, India
| | - Jyoti
- Department of Chemistry, Panjab Univeristy, Chandigarh, 160014, India
| | - Navneet Kaur
- Department of Chemistry, Panjab Univeristy, Chandigarh, 160014, India
| | - Bhupender Singh
- Department of Chemistry, Panjab Univeristy, Chandigarh, 160014, India
- Department of Chemistry, Pandit Neki Ram Sharma Government College Rohtak, Rohtak, Haryana, 124001, India
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Iradukunda Y, Kang JY, Nsanzamahoro S, Fu XK, Muhire J, Shi YP. Green-emitting functionalized silicon nanoparticles as an "off-on" fluorescence bio-probe for the sensitive and selective detection of mercury (II) and 3-mercaptopropionic acid. Talanta 2023; 256:124322. [PMID: 36736269 DOI: 10.1016/j.talanta.2023.124322] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Revised: 01/18/2023] [Accepted: 01/29/2023] [Indexed: 02/01/2023]
Abstract
Herein, we developed a class of functionalized silicon nanoparticles (F-SiNPs) bio-probes named thiol-conjugated F-SiNPs. They combine excellent biocompatibility with small dimensions (<10 nm) and biological usefulness with sustained and robust fluorescence (3.32% photoluminescent quantum yield). Identifying 3-Mercaptopropionic acid (3-MPA), which lowers the quantity of gamma-aminobutyric acid in the brain, and mercury (Hg2+) was a crucially important step since their excessive levels are a sign of several disorders. Using F-SiNPs as a fluorescent bio-probe, we provided an "off-on" technique for sensitively and selectively determining Hg2+ and 3-MPA in this study. The 3-(2-aminoethylamino) propyl (dimethoxymethylsilane) and basic fuchsin as precursors were hydrothermally treated to produce the F-SiNPs exhibiting green fluorescence. Our results suggest that Hg2+ reduced the fluorescence of F-SiNPs because of strong ionic interactions and metal-ligand binding among many thiols and carboxyl groupings at the surface of Hg2+ and F-SiNPs. Additionally, the resultants demonstrated that after being quenched by Hg2+, the produced F-SiNPs led to the distinctive "off-on" response to 3-MPA. Moreover, the method could detect Hg2+ and 3-MPA with limits of detection of 0.065 μM and 0.017 μM, respectively. The technique employed is quick, easy, affordable, and environmentally friendly. The sensing platform has successfully determined Hg2+ and 3-MPA in urine, water, and human serum samples.
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Affiliation(s)
- Yves Iradukunda
- CAS Key Laboratory of Chemistry of Northwestern Plant Resources, Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences (CAS), Lanzhou, 730000, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China
| | - Jing-Yan Kang
- CAS Key Laboratory of Chemistry of Northwestern Plant Resources, Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences (CAS), Lanzhou, 730000, PR China
| | - Stanislas Nsanzamahoro
- CAS Key Laboratory of Chemistry of Northwestern Plant Resources, Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences (CAS), Lanzhou, 730000, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China
| | - Xiao-Kang Fu
- CAS Key Laboratory of Chemistry of Northwestern Plant Resources, Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences (CAS), Lanzhou, 730000, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China
| | - Jules Muhire
- CAS Key Laboratory of Chemistry of Northwestern Plant Resources, Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences (CAS), Lanzhou, 730000, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China
| | - Yan-Ping Shi
- CAS Key Laboratory of Chemistry of Northwestern Plant Resources, Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences (CAS), Lanzhou, 730000, PR China.
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Xanthan Gum-Mediated Silver Nanoparticles for Ultrasensitive Electrochemical Detection of Hg2+ Ions from Water. Catalysts 2023. [DOI: 10.3390/catal13010208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
An environmentally safe, efficient, and economical microwave-assisted technique was selected for the production of silver nanoparticles (AgNPs). To prepare uniformly disseminated AgNPs, xanthan gum (XG) was utilized as both a reducing and capping agent. UV–Vis spectroscopy was used to characterize the formed XG-AgNPs, with the absorption band regulated at 414 nm under optimized parameters. Atomic force microscopy was used to reveal the size and shape of XG-AgNPs. The interactions between the XG capping agent and AgNPs observed using Fourier transform infrared spectroscopy. The XG-AgNPs were placed in between glassy carbon electrode and Nafion® surfaces and then deployed as sensors for voltammetric evaluation of mercury ions (Hg2+) using square-wave voltammetry as an analytical mode. Required Nafion® quantities, electrode behavior, electrolyte characteristics, pH, initial potentials, accumulation potentials, and accumulation durations were all comprehensively investigated. In addition, an electrochemical mechanism for the oxidation of Hg2+ was postulated. With an exceptional limit of detection of 0.18 ppb and an R2 value of 0.981, the sensors’ measured linear response range was 0.0007–0.002 µM Hg2+. Hg2+ evaluations were ultimately unaffected by the presence of many coexisting metal ions (Cd2+, Pb2+, Cr2O4, Co2+,Cu2+, CuSO4). Spiked water samples were tested using the described approach, with Hg2+ recoveries ranging from 97% to 100%.
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Yahya R, Shah A, Kokab T, Ullah N, Hakeem MK, Hayat M, Haleem A, Shah I. Electrochemical Sensor for Detection and Degradation Studies of Ethyl Violet Dye. ACS OMEGA 2022; 7:34154-34165. [PMID: 36188263 PMCID: PMC9520707 DOI: 10.1021/acsomega.2c03472] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Accepted: 08/30/2022] [Indexed: 06/16/2023]
Abstract
In this work, a simple and sensitive electrochemical method was developed to determine ethyl violet (EV) dye in aqueous systems by using square wave anodic stripping voltammetry (SWASV) employing a glassy carbon electrode modified with acidic-functionalized carbon nanotubes (COOH-fCNTs). In square wave anodic stripping voltammetry, EV exhibited a well-defined oxidation peak at 0.86 V at the modified GCE. Impedance spectroscopy and cyclic voltammetry were used to examine the charge transduction and sensing capabilities of the modified electrode. The influence of pH, deposition potential, and accumulation time on the electro-oxidation of EV was optimized. Under the optimum experimental conditions, the limit of detection with a value of 0.36 nM demonstrates high sensitivity of COOH-fCNTs/GCE for EV. After detection, it was envisioned to devise a method for the efficient removal of EV from an aqueous system. In this regard a photocatalytic degradation method of EV using Ho/TiO2 nanoparticles was developed. The Ho/TiO2 nanoparticles synthesized by the sol-gel method were characterized by UV-vis, XRD, FTIR, SEM, and EDX. The photocatalytic degradation studies revealed that basic medium is more suitable for a higher degradation rate of EV than acidic and neutral media. The photodegradation kinetic parameters were evaluated using UV-vis spectroscopic and electrochemical methods. The results revealed that the degradation process of EV follows first-order kinetics.
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Affiliation(s)
- Rashida Yahya
- Department
of Chemistry, Quaid-i-Azam University, 45320, Islamabad, Pakistan
| | - Afzal Shah
- Department
of Chemistry, Quaid-i-Azam University, 45320, Islamabad, Pakistan
| | - Tayyaba Kokab
- Department
of Chemistry, Quaid-i-Azam University, 45320, Islamabad, Pakistan
| | - Naimat Ullah
- Department
of Chemistry, Quaid-i-Azam University, 45320, Islamabad, Pakistan
| | | | - Mazhar Hayat
- Department
of Chemistry, Quaid-i-Azam University, 45320, Islamabad, Pakistan
| | - Abdul Haleem
- Department
of Chemistry, Quaid-i-Azam University, 45320, Islamabad, Pakistan
| | - Iltaf Shah
- Department
of Chemistry, College of Science, United
Arab Emirates University, Al Ain P.O. Box 15551, United Arab Emirates
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