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Sapna K, Shim YB, Arun AB, Prasad KS. Diagnosis of Neglected Tropical Zoonotic Disease, Leptospirosis in a Clinical Sample Using a Photothermal Immunosensor. Anal Chem 2024; 96:409-418. [PMID: 38112052 DOI: 10.1021/acs.analchem.3c04447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2023]
Abstract
Photothermal biosensing based on nanomaterials has gained increasing attention because of its universality and simplicity. Diagnostics of neglected tropical diseases (NTDs) in low-resource settings are challenging in terms of speed, accuracy, and cost-effectiveness. By exploiting the photothermal property of carbon nanotubes (CNTs), simple thermometric measurements can be used to generate quantitative biochemical readouts. Herein, a photothermal immunosensor for leptospirosis detection based on a CNT-labeled monoclonal antibody is established through the sensitive monitoring of the target biomarker LipL32 with a simple thermometer. Under optimum conditions, a linear range up to 106 pg/mL with a limit of detection (LOD) of 300 fg/mL was obtained. Overall, the proposed immunoassay exhibited good precision, selectivity, and acceptable stability. Clinical patient sample analysis with the photothermal sensor proved the differential diagnosis of leptospirosis along with other febrile illnesses. On the other hand, we have also characterized the photothermal sensor platform with surface morphological and spectral techniques to confirm the robust and successful fabrication of the immunosensor. The fabricated photothermal sensor could be used as a potential diagnostic tool for the early detection of NTDs in patients from resource-limited settings, as it does not require sample pretreatment, sophisticated equipment, or skilled labor. Moreover, the developed photothermal assay follows ASSURED criteria, very crucial for diagnosis in resource-limited settings.
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Affiliation(s)
- Kannan Sapna
- Nanomaterial Research Laboratory (NMRL), Smart Materials and Devices, Yenepoya Research Centre, Yenepoya (Deemed to be University), Deralakatte, Mangalore 575018, India
- Yenepoya Research Centre, Yenepoya (Deemed to be University), Deralakatte, Mangalore 575 018, India
| | - Yoon-Bo Shim
- Department of Chemistry and Institute of Biophysio Sensor Technology, Pusan National University, Busan 46241, Republic of Korea
| | | | - Kariate Sudhakara Prasad
- Nanomaterial Research Laboratory (NMRL), Smart Materials and Devices, Yenepoya Research Centre, Yenepoya (Deemed to be University), Deralakatte, Mangalore 575018, India
- Centre for Nutrition Studies, Yenepoya (Deemed to be University), Deralakatte, Mangalore 575 018, India
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Zhao X, Guo J, Xiao T, Zhang Y, Yan Y, Grzybowski BA. Charged Metal Nanoparticles for Chemoelectronic Circuits. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1804864. [PMID: 30687979 DOI: 10.1002/adma.201804864] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2018] [Revised: 11/08/2018] [Indexed: 06/09/2023]
Abstract
Although metal nanoparticles (NPs) stabilized with self-assembled monolayers (SAMs) of various organic ligands have proven useful in applications ranging from chemical sensing, to bionanotechnology, to plasmonics and energy conversion, they have not been widely considered as suitable building blocks of electronic circuitry, largely because metals screen electric fields and prevent electrically tunable conductivity. However, when metal nanoparticles a few nanometers in size are stabilized by charged ligands and placed under bias, the counterions surrounding the NPs can redistribute and establish local electric fields that feed back into the electronic currents passing through the nanoparticles' metallic cores. Herein, the manner in which the interplay between counterion gradients and electron flows can be controlled by using different types of SAMs is discussed. This can give rise to a new class of nanoparticle-based "chemoelectronic" logic circuits capable of sensing, processing, and ultimately reporting various chemical signals.
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Affiliation(s)
- Xing Zhao
- CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, China
| | - Jiahui Guo
- CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Tao Xiao
- CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yuchun Zhang
- CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, China
| | - Yong Yan
- CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing, 100190, China
| | - Bartosz A Grzybowski
- IBS Center for Soft and Living Matter and Department of Chemistry, UNIST, 50, UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan, 44919, South Korea
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Mukherjee T, Ghosh G, Mukherjee R, Das TK. Study of arsenic (III) removal by monolayer protected silver nanoadsorbent and its execution on prokaryotic system. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2019; 244:440-452. [PMID: 31153032 DOI: 10.1016/j.jenvman.2019.05.004] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2019] [Revised: 04/18/2019] [Accepted: 05/01/2019] [Indexed: 06/09/2023]
Abstract
This work deals with the removal of arsenic by nanoadsorbent from aqueous environment that is subsequently applied to the biological system for the evaluation of its efficiency. We started our aspiration by the modification of carboxylate functionalized silver nanoparticle (nanoadsorbent) fabrication process. Batch mode arsenic uptake study by the nanoadsorbent was conducted considering several altering parameters and the reactants in addition to products were evaluated by several analytical techniques for the interpretation of the interaction mechanism. It was found nanoadsorbent, Ag@MSA is an efficient system for the exclusion of arsenic (III) from the aqueous system and due to the alteration in the ratio of silver content and protective agent, the characteristic profile of silver nanoparticles with an average diameter of 15 nm also became changed in respect of reported results. Here the low pH range (4-6) favors the interaction between nanoparticle and arsenic and it was found that the interaction was chemical in nature through adsorption or complex formation with surface carboxylate groups of the protecting agent (MSA). Following the interaction, a successful removal of arsenic (III) was achieved at a percentage of 94.16 with an initial concentration of 45 mg/L and equilibrium time of 60 min. Hence nanoparticles were executed against the toxic effect of arsenic in E. coli, an important gut microbe of higher animals, for the restoration of bacterial growth in arsenic pre-removed media. In this context the validation of this removal efficiency against arsenic induced toxicity was proved through several morphological studies, degree of oxidative damages and other biochemical attributes.
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Affiliation(s)
- Triparna Mukherjee
- Department of Biochemistry and Biophysics, University of Kalyani, Kalyani, 741235, India
| | - Gargi Ghosh
- Department of Molecular Biology and Biotechnology, University of Kalyani, Kalyani, 741235, India
| | - Riya Mukherjee
- Department of Biochemistry and Biophysics, University of Kalyani, Kalyani, 741235, India
| | - Tapan Kumar Das
- Department of Biochemistry and Biophysics, University of Kalyani, Kalyani, 741235, India.
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Zhang P, Lyu Z, Viktorova J, Offenhäusser A, Feng L, Mayer D. Nanoparticle stripe sensor for highly sensitive and selective detection of mercury ions. Biosens Bioelectron 2018; 117:450-456. [DOI: 10.1016/j.bios.2018.06.029] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Revised: 06/08/2018] [Accepted: 06/18/2018] [Indexed: 10/28/2022]
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5
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Gao W, Xu Y, Wei W, Wang D, Shi X. Ultrasensitive determination of mercury ions (Ⅱ) by analysis of the degree of quantum dots aggregation. Talanta 2018; 188:644-650. [DOI: 10.1016/j.talanta.2018.06.039] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Revised: 05/06/2018] [Accepted: 06/11/2018] [Indexed: 12/31/2022]
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Khashayar P, Amoabediny G, Larijani B, Hosseini M, Vanfleteren J. Fabrication and Verification of Conjugated AuNP-Antibody Nanoprobe for Sensitivity Improvement in Electrochemical Biosensors. Sci Rep 2017; 7:16070. [PMID: 29167431 PMCID: PMC5700097 DOI: 10.1038/s41598-017-12677-w] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2017] [Accepted: 09/18/2017] [Indexed: 11/21/2022] Open
Abstract
This study was designed to obtain covalently coupled conjugates as means for achieving higher stability and better coverage of the AuNPs by antibodies on the particle surface suitable for sensor performance enhancement. Starting by using a modified protocol, colloid gold solution, with mean AuNP core size of ~6 nm was synthesized. The protocol used for conjugation of AuNPs to osteocalcin antibody in this study relies on covalent and electrostatic attractions between constituents. Varieties of conjugates with varying combinations of crosslinkers and different concentrations were successfully synthesized. The obtained products were characterized and their properties were studied to determine the best candidate in sense of antibody - antigen reactivity. Using AuNP-GSH-NHS-Ab combination (1:1:1), the tertiary structure of the protein was maintained and thus the antibody remained functional in the future steps. This one-pot method provided a simple method for covalently coupling antibodies on the particle surface while keeping their functionality intact. The AuNP content of the solution also accelerated electron transfer rate and thus amplifies the detection signal. With the developed and discussed technique herein, a simple solution is modeled to be used for measuring serum levels of biomarkers in single and/or multiplexed sensor systems.
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Affiliation(s)
- Patricia Khashayar
- Nanobiotechnalogy Department, Faculty of New Sciences & Technologies, University of Tehran, Tehran, Iran
- Center for Microsystems Technology, imec and Ghent University, Gent-Zwijnaarde, Belgium
- Osteoporosis Research Center, Endocrinology and Metabolism Clinical Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran
| | - Ghassem Amoabediny
- Department of Biotechnology, Faculty of Chemical Engineering, School of Engineering, University of Tehran, Tehran, Iran.
- Nanobiotechnology Department, Research Center for New Technology in Life Sciences Engineering, University of Tehran, Tehran, Iran.
| | - Bagher Larijani
- Endocrinology and Metabolism Research Center, Endocrinology and Metabolism Clinical Sciences Institute, Tehran University of Medical Sciences, Tehran, Iran
| | - Morteza Hosseini
- Nanobiotechnalogy Department, Faculty of New Sciences & Technologies, University of Tehran, Tehran, Iran
| | - Jan Vanfleteren
- Center for Microsystems Technology, imec and Ghent University, Gent-Zwijnaarde, Belgium.
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Chinnakkannu Vijayakumar S, Venkatakrishnan K, Tan B. SERS Active Nanobiosensor Functionalized by Self-Assembled 3D Nickel Nanonetworks for Glutathione Detection. ACS APPLIED MATERIALS & INTERFACES 2017; 9:5077-5091. [PMID: 28117567 DOI: 10.1021/acsami.6b13576] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We introduce a "non-noble metal" based SERS active nanobiosensor using a self-assembled 3D hybrid nickel nanonetwork. A tunable biomolecule detector fabricated by a bottom-up approach was functionalized using a multiphoton ionization energy mechanism to create a self-assembled 3D hybrid nickel nanonetwork. The nanonetwork was tested for SERS detection of crystal violet (CV) and glutathione (GSH) at two excitation wavelengths, 532 and 785 nm. The results reveal indiscernible peaks with a limit of detection (LOD) of 1 picomolar (pM) concentration. An enhancement factor (EF) of 9.3 × 108 was achieved for the chemical molecule CV and 1.8 × 109 for the biomolecule GSH, which are the highest reported values so far. The two results, one being the CV molecule proved that nickel nanonetwork is indeed SERS active and the second being the GSH biomolecule detection at both 532 and 785 nm, confirm that the nanonetwork is a biosensor which has potential for both in vivo and in vitro sensing. In addition, the selectivity and versatility of this biosensor is examined with biomolecules such as l-Cysteine, l-Methionine, and sensing GSH in cell culture medium which mimics the complex biological environment. The functionalized self-assembled 3D hybrid nickel nanonetwork exhibits electromagnetic and charge transfer based SERS activation mechanisms.
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Affiliation(s)
- Sivaprasad Chinnakkannu Vijayakumar
- Micro/Nanofabrication facility, Department of Mechanical and Industrial Engineering, Ryerson University , 350 Victoria street, Toronto, Ontario M5B 2K3, Canada
| | - Krishnan Venkatakrishnan
- Micro/Nanofabrication facility, Department of Mechanical and Industrial Engineering, Ryerson University , 350 Victoria street, Toronto, Ontario M5B 2K3, Canada
- Affiliate Scientist, Keenan Research Center, St. Michael's Hospital , 209 Victoria Street, Toronto, Ontario M5B 1T8, Canada
| | - Bo Tan
- Nanocharacterization Laboratory, Department of Aerospace Engineering, Ryerson University , 350 Victoria Street, Toronto, Ontario M5B 2K3, Canada
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Cui H, Xiong X, Gao B, Chen Z, Luo Y, He F, Deng S, Chen L. A Novel Impedimetric Biosensor for Detection of Lead (II) with Low-cost Interdigitated Electrodes Made on PCB. ELECTROANAL 2016. [DOI: 10.1002/elan.201501153] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Haixia Cui
- School of Medical Information; Chongqing Medical University; No. 1, Yixueyuan Road, Yuzhong District Chongqing 400016 China
| | - Xingliang Xiong
- School of Medical Information; Chongqing Medical University; No. 1, Yixueyuan Road, Yuzhong District Chongqing 400016 China
| | - Bin Gao
- School of Medical Information; Chongqing Medical University; No. 1, Yixueyuan Road, Yuzhong District Chongqing 400016 China
| | - Zhen Chen
- School of Medical Information; Chongqing Medical University; No. 1, Yixueyuan Road, Yuzhong District Chongqing 400016 China
| | - Yiting Luo
- School of Medical Information; Chongqing Medical University; No. 1, Yixueyuan Road, Yuzhong District Chongqing 400016 China
| | - Fengjie He
- School of Medical Information; Chongqing Medical University; No. 1, Yixueyuan Road, Yuzhong District Chongqing 400016 China
| | - Shixiong Deng
- Department of Biomedical Engineering; Chongqing Medical University; No. 1, Yixueyuan Road, Yuzhong District Chongqing 400016 China
| | - Longcong Chen
- School of Medical Information; Chongqing Medical University; No. 1, Yixueyuan Road, Yuzhong District Chongqing 400016 China
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9
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Lu Y, Guo Z, Song JJ, Huang QA, Zhu SW, Huang XJ, Wei Y. Tunable nanogap devices for ultra-sensitive electrochemical impedance biosensing. Anal Chim Acta 2016; 905:58-65. [PMID: 26755137 DOI: 10.1016/j.aca.2015.11.036] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2014] [Accepted: 11/29/2015] [Indexed: 11/29/2022]
Abstract
A wealth of research has been available discussing nanogap devices for detecting very small quantities of biomolecules by observing their electrical behavior generally performed in dry conditions. We report that a gold nanogapped electrode with tunable gap length for ultra-sensitive detection of streptavidin based on electrochemical impedance technique. The gold nanogap is fabricated using simple monolayer film deposition and in-situ growth of gold nanoparticles in a traditional interdigitated array (IDA) microelectrode. The electrochemical impedance biosensor with a 25-nm nanogap is found to be ultra-sensitive to the specific binding of streptavidin to biotin. The binding of the streptavidin hinder the electron transfer between two electrodes, resulting in a large increase in electron-transfer resistance (Ret) for operating the impedance. A linear relation between the relative Ret and the logarithmic value of streptavidin concentration is observed in the concentration range from 1 pM (picomolar) to 100 nM (nanomolar). The lowest detectable concentration actually measured reaches 1 pM. We believe that such an electrochemical impedance nanogap biosensor provides a useful approach towards biomolecular detection that could be extended to a number of other systems.
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Affiliation(s)
- Yong Lu
- Department of Chemistry, Wannan Medical College, Wuhu 241002, PR China
| | - Zheng Guo
- Nanomaterials and Environmental Detection Laboratory, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031, PR China
| | - Jing-Jing Song
- Department of Chemistry, Wannan Medical College, Wuhu 241002, PR China
| | - Qin-An Huang
- Department of Chemistry, Wannan Medical College, Wuhu 241002, PR China
| | - Si-Wei Zhu
- Department of Chemistry, Wannan Medical College, Wuhu 241002, PR China
| | - Xing-Jiu Huang
- Nanomaterials and Environmental Detection Laboratory, Institute of Intelligent Machines, Chinese Academy of Sciences, Hefei 230031, PR China
| | - Yan Wei
- Department of Chemistry, Wannan Medical College, Wuhu 241002, PR China.
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10
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Zhao M, Fan GC, Chen JJ, Shi JJ, Zhu JJ. Highly Sensitive and Selective Photoelectrochemical Biosensor for Hg2+ Detection Based on Dual Signal Amplification by Exciton Energy Transfer Coupled with Sensitization Effect. Anal Chem 2015; 87:12340-7. [DOI: 10.1021/acs.analchem.5b03721] [Citation(s) in RCA: 93] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Ming Zhao
- School of Chemical
Engineering, Anhui University of Science and Technology, Huainan 232001, People’s Republic of China
| | - Gao-Chao Fan
- State Key Laboratory of Analytical Chemistry for Life Science, Collaborative
Innovation Center of Chemistry for Life Sciences, School of Chemistry
and Chemical Engineering, Nanjing University, Nanjing 210093, People’s Republic of China
| | - Jing-Jia Chen
- State Key Laboratory of Analytical Chemistry for Life Science, Collaborative
Innovation Center of Chemistry for Life Sciences, School of Chemistry
and Chemical Engineering, Nanjing University, Nanjing 210093, People’s Republic of China
| | - Jian-Jun Shi
- School of Chemical
Engineering, Anhui University of Science and Technology, Huainan 232001, People’s Republic of China
- State Key Laboratory of Analytical Chemistry for Life Science, Collaborative
Innovation Center of Chemistry for Life Sciences, School of Chemistry
and Chemical Engineering, Nanjing University, Nanjing 210093, People’s Republic of China
| | - Jun-Jie Zhu
- State Key Laboratory of Analytical Chemistry for Life Science, Collaborative
Innovation Center of Chemistry for Life Sciences, School of Chemistry
and Chemical Engineering, Nanjing University, Nanjing 210093, People’s Republic of China
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11
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DNA-engineered chiroplasmonic heteropyramids for ultrasensitive detection of mercury ion. Biosens Bioelectron 2015; 68:516-520. [DOI: 10.1016/j.bios.2015.01.028] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Revised: 01/03/2015] [Accepted: 01/12/2015] [Indexed: 01/11/2023]
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12
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Senthamizhan A, Celebioglu A, Uyar T. Real-time selective visual monitoring of Hg(2+) detection at ppt level: An approach to lighting electrospun nanofibers using gold nanoclusters. Sci Rep 2015; 5:10403. [PMID: 26020609 PMCID: PMC4446990 DOI: 10.1038/srep10403] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2014] [Accepted: 04/13/2015] [Indexed: 12/13/2022] Open
Abstract
In this work, fluorescent gold nanocluster (AuNC) decorated polycaprolactone (PCL) nanofibers (AuNC*PCL-NF) for real time visual monitoring of Hg(2+) detection at ppt level in water is demonstrated. The resultant AuNC*PCL-NF exhibiting remarkable stability more than four months at ambient environment and facilitates increased accessibility to active sites resulting in improved sensing performance with rapid response time. The fluorescence changes of AuNC*PCL-NF and their corresponding time dependent spectra, upon introduction of Hg(2+), led to the visual identification of the sensor performance. It is observed that the effective removal of excess ligand (bovine serum albumin (BSA) greatly enhances the surface exposure of AuNC and therefore their selective sensing performance is achieved over competent metal ions such as Cu(2+), Ni(2+), Mn(2+), Zn(2+), Cd(2+), and Pb(2+) present in the water. An exceptional interaction is observed between AuNC and Hg(2+), wherein the absence of excess interrupting ligand makes AuNC more selective towards Hg(2+). The underlying mechanism is found to be due to the formation of Au-Hg amalgam, which was further investigated with XPS, TEM and elemental mapping studies. In short, our findings may lead to develop very efficient fluorescent-based nanofibrous mercury sensor, keeping in view of its stability, simplicity, reproducibility, and low cost.
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Affiliation(s)
- Anitha Senthamizhan
- UNAM-National Nanotechnology Research Center, Bilkent University, Ankara, 06800, Turkey
| | - Asli Celebioglu
- 1] UNAM-National Nanotechnology Research Center, Bilkent University, Ankara, 06800, Turkey [2] Institute of Materials Science &Nanotechnology, Bilkent University, Ankara, 06800, Turkey
| | - Tamer Uyar
- 1] UNAM-National Nanotechnology Research Center, Bilkent University, Ankara, 06800, Turkey [2] Institute of Materials Science &Nanotechnology, Bilkent University, Ankara, 06800, Turkey
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de Villiers CA, Lapsley MC, Hall EAH. A step towards mobile arsenic measurement for surface waters. Analyst 2015; 140:2644-55. [PMID: 25822044 DOI: 10.1039/c4an02368d] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Surface modified quantum dots (QDs) are studied using a bio-inspired cysteine rich ligand (glutathione, GSH) and their quenching response and selectivity to arsenic examined. As predicted from As(3+) binding with highly crosslinked phytochelatin-(PCn)-like molecules, better arsenic selectivity is obtained for a thicker more 3-dimensional GSH surface layer, with exposed sulfhydryl groups. A detection limit of at least 10 μM can be achieved using CdSe/ZnS core-shell QDs capped with this GSH structure. The system is also demonstrated using a mobile phone camera to record the measurement, producing a detection limit of 5 μM. However, copper remains the main interferent of concern. Water-soluble CdTe QDs show little sensitivity to As(3+) even with a GSH surface, but they remain sensitive to Cu(2+), allowing a copper baseline to be established from the CdTe measurement. Despite anticipating that spectrally non overlapping fluorescence would be required from the two types of QDs to achieve this, a method is demonstrated using RGB channels from a mobile phone and processing the raw data for CdTe QDs, with an emission wavelength of 600 nm, and CdSe/ZnS QDs, with emission maximum of 630 nm. It is shown that As(3+) measurement remains feasible at the WHO guideline value of 10 μg L(-1) up to a copper concentration of around 0.3 μM Cu(2+), which corresponds to the highest recorded level in a selection of large rivers world-wide.
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Affiliation(s)
- C A de Villiers
- Institute of Biotechnology, Department of Chemical Engineering and Biotechnology, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QT, UK.
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14
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Zhu YP, Ma TY, Ren TZ, Yuan ZY. Mesoporous cerium phosphonate nanostructured hybrid spheres as label-free Hg²⁺ fluorescent probes. ACS APPLIED MATERIALS & INTERFACES 2014; 6:16344-16351. [PMID: 25163834 DOI: 10.1021/am504554h] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Porous phosphonate-based organic-inorganic hybrid materials have been shown to have novel and amazing physicochemical properties due to the integration of superiorities from both inorganic components and organic moieties. Herein, mesoporous cerium phosphonate nanostructured hybrid spheres are prepared with the assistance of cationic surfactant cetyltrimethylammonium bromide while using ethylene diamine tetra(methylene phosphonic acid) as the coupling molecule. The resulting hybrid is constructed from the cerium phosphonate nanoparticles, accompanied by high specific surface area of 455 m(2) g(-1). The uniform incorporation of rare-earth element cerium and organophosphonic functionalities endows mesoporous cerium phosphonate with excellent fluorescence properties for the development of an optical sensor for selective Hg(2+) detection on the basis of the fluorescence-quenching mechanism. The signal response of mesoporous cerium phosphonate against the Hg(2+) concentration is linear over the range from 0.05 to 1.5 μmol L(-1), giving a limit of detection of 16 nmol L(-1) (at a signal-to-noise ratio of 3). Most of the common physiologically relevant cations and anions did not interfere with the detection of Hg(2+). This label-free system provides a promising platform for further use in bioimaging and biomedical fields.
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Affiliation(s)
- Yun-Pei Zhu
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), College of Chemistry, Nankai University , Tianjin 300071, China
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Guerrini L, Rodriguez-Loureiro I, Correa-Duarte MA, Lee YH, Ling XY, García de Abajo FJ, Alvarez-Puebla RA. Chemical speciation of heavy metals by surface-enhanced Raman scattering spectroscopy: identification and quantification of inorganic- and methyl-mercury in water. NANOSCALE 2014; 6:8368-75. [PMID: 24938410 DOI: 10.1039/c4nr01464b] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Chemical speciation of heavy metals has become extremely important in environmental and analytical research because of the strong dependence that toxicity, environmental mobility, persistence and bioavailability of these pollutants have on their specific chemical forms. Novel nano-optical-based detection strategies, capable of overcoming the intrinsic limitations of well-established analytic methods for the quantification of total metal ion content, have been reported, but the speciation of different chemical forms has not yet been achieved. Here, we report the first example of a SERS-based sensor for chemical speciation of toxic metal ions in water at trace levels. Specifically, the inorganic Hg(2+) and the more toxicologically relevant methylmercury (CH₃Hg(+)) are selected as analytical targets. The sensing platform consists of a self-assembled monolayer of 4-mercaptopyridine (MPY) on highly SERS-active and robust hybrid plasmonic materials formed by a dense layer of interacting gold nanoparticles anchored onto polystyrene microbeads. The co-ordination of Hg(2+) and CH₃Hg(+) to the nitrogen atom of the MPY ring yields characteristic changes in the vibrational SERS spectra of the organic chemoreceptor that can be qualitatively and quantitatively correlated to the presence of the two different mercury forms.
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Affiliation(s)
- Luca Guerrini
- Departamento de Química Física e Inorgánica, Universitat Rovira i Virgili, Avda. Països Catalans 26, 43007 Tarragona, Spain.
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