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Supraja P, Tripathy S, Govind Singh S. Smartphone-powered, ultrasensitive, and selective, portable and stable multi-analyte chemiresistive immunosensing platform with PPY/COOH-MWCNT as bioelectrical transducer: Towards point-of-care TBI diagnosis. Bioelectrochemistry 2023; 151:108391. [PMID: 36805206 DOI: 10.1016/j.bioelechem.2023.108391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 12/24/2022] [Accepted: 01/27/2023] [Indexed: 02/11/2023]
Abstract
Traumatic Brain Injury, one of the significant causes of mortality and morbidity, affects worldwide and continues to be a diagnostic challenge. The most desirable and partially met clinical need is to simultaneously detect the disease-specific-biomarkers in a broad range of readily available body fluids on a single platform with a rapid, low-cost, ultrasensitive and selective device. Towards this, an array of interdigitated microelectrodes was fabricated on commercially existing low-cost single-side copper cladded printed-circuit-board substrate followed by the bioelectrodes preparation through covalent immobilization of brain injury specific biomarkers on carboxylic functionalized multi-walled carbon nanotubes embedded polypyrrole nanocomposite modified interdigitated microelectrodes. Subsequently, the immunological binding events were transduced as the normalized change in bioelectrode resistance with and without the target analyte via current-voltage analysis. As proof of concept, current-voltage responses were primarily recorded using a conventional probe station, and later, a portable handheld-electronic-readout was developed for the point-of-care application. The data compilation and analysis were carried out using the in-house developed android-based mobile app. Notably, the smartphone powered the readout through a PL-2303 serial connector, avoiding integrating power sources with the readout. Further, this technology can be adapted to other point-of-care biosensing applications.
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Affiliation(s)
- Patta Supraja
- Department of Electrical Engineering, Indian Institute of Technology Hyderabad, 502285, India.
| | - Suryasnata Tripathy
- Department of Electronics and Communication Engineering, Indian Institute of Information Technology Surat, 395007, India.
| | - Shiv Govind Singh
- Department of Electrical Engineering, Indian Institute of Technology Hyderabad, 502285, India.
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Supraja P, Tripathy S, Krishna Vanjari SR, Singh SG. Label-free, ultrasensitive and rapid detection of FDA-approved TBI specific UCHL1 biomarker in plasma using MWCNT-PPY nanocomposite as bio-electrical transducer: A step closer to point-of-care diagnosis of TBI. Biosens Bioelectron 2022; 216:114631. [PMID: 35973277 DOI: 10.1016/j.bios.2022.114631] [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: 04/18/2022] [Revised: 08/05/2022] [Accepted: 08/07/2022] [Indexed: 11/02/2022]
Abstract
Traumatic Brain Injury (TBI), a major cause of mortality and neurological disability affecting people of all ages worldwide, remains a diagnostic and therapeutic challenge to date. Rapid, ultra-sensitive, selective, and wide-range detection of TBI biomarkers in easily accessible body fluids is an unmet clinical need. Considering this, in this work, we report the design and development of a facile, label-free, highly stable and sensitive, chemi-impedance-based sensing platform for rapid and wide range detection of Ubiquitin-carboxy terminal hydrolase L1 (UCHL1: FDA-approved TBI specific plasma biomarker), using carboxylic functionalized MWCNTs embedded polypyrrole (PPY) nanocomposites (PPY/f-MWCNT). The said nanocomposites were synthesized using chemical oxidative polymerization method. Herein, the functionalized MWCNTs are used as conducting fillers so as to increase the polymer's dielectric constant according to the micro-capacitor model, thereby augmenting both DC electrical conductivity and AC dielectric property of the nanocomposite. The proposed immunosensing platform comprises of PPY/f-MWCNT modified interdigitated microelectrode (IDμEs) array, on which anti-UCHL1-antibodies are immobilized using suitable covalent chemistry. The AC electrical characterization of the nanocomposite modified IDμEs, with and without the antibodies, was performed through generic capacitance vs. frequency (C-F, 1 KHz - 1 MHz) and capacitance vs. applied bias (C-V, 0.1 V-1 V) measurements, using an Agilent B1500A parametric analyzer. The binding event of UCHL1 peptides to anti-UCHL1-antibodies was transduced in terms of normalised changes in parallel capacitance, via the C-F analysis. Further, we have tested the detection efficiency of the said immunoassay against UCHL1 spiked human plasma samples in the concentration range 10 fg/mL - 1 μg/mL. The proposed sensing platform detected UCHL1 in spiked-plasma samples linearly in the range of 10 fg/mL - 1 ng/mL with a sensitivity and LoD of 4.22 ((ΔC/C0)/ng.mL-1)/cm2 and 0.363 fg/mL, respectively. Further, it showed excellent stability (30 weeks), repeatability, reproducibility, selectivity and interference-resistance. The proposed approach is label-free, and if desired, can be used in conjunction with DC measurements, for biosensing applications.
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Affiliation(s)
- Patta Supraja
- Department of Electrical Engineering, Indian Institute of Technology Hyderabad, 502285, India.
| | - Suryasnata Tripathy
- Department of Electronics and Communication Engineering, Indian Institute of Information Technology Surat, 395007, India.
| | | | - Shiv Govind Singh
- Department of Electrical Engineering, Indian Institute of Technology Hyderabad, 502285, India.
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3
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Tripathy S, Supraja P, Mohanty S, Sai VM, Agrawal T, Chowdary CG, Taranikanti M, Bandaru R, Mudunuru AK, Tadi LJ, Suravaram S, Siddiqui IA, Maddur S, Guntuka RK, Singh R, Singh V, Singh SG. Artificial Intelligence-Based Portable Bioelectronics Platform for SARS-CoV-2 Diagnosis with Multi-nucleotide Probe Assay for Clinical Decisions. Anal Chem 2021; 93:14955-14965. [PMID: 34694783 DOI: 10.1021/acs.analchem.1c01650] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
In the context of the recent pandemic, the necessity of inexpensive and easily accessible rapid-test kits is well understood and need not be stressed further. In light of this, we report a multi-nucleotide probe-based diagnosis of SARS-CoV-2 using a bioelectronics platform, comprising low-cost chemiresistive biochips, a portable electronic readout, and an Android application for data acquisition with machine-learning-based decision making. The platform performs the desired diagnosis from standard nasopharyngeal and/or oral swabs (both on extracted and non-extracted RNA samples) without amplifying the viral load. Being a reverse transcription polymerase chain reaction-free hybridization assay, the proposed approach offers inexpensive, fast (time-to-result: ≤ 30 min), and early diagnosis, as opposed to most of the existing SARS-CoV-2 diagnosis protocols recommended by the WHO. For the extracted RNA samples, the assay accounts for 87 and 95.2% test accuracies, using a heuristic approach and a machine-learning-based classification method, respectively. In case of the non-extracted RNA samples, 95.6% decision accuracy is achieved using the heuristic approach, with the machine-learning-based best-fit model producing 100% accuracy. Furthermore, the availability of the handheld readout and the Android application-based simple user interface facilitates easy accessibility and portable applications. Besides, by eliminating viral RNA extraction from samples as a pre-requisite for specific detection, the proposed approach presents itself as an ideal candidate for point-of-care SARS-CoV-2 diagnosis.
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Affiliation(s)
- Suryasnata Tripathy
- Indian Institute of Technology Hyderabad, Kandi, Sangareddy, Telangana 502285, India
| | - Patta Supraja
- Indian Institute of Technology Hyderabad, Kandi, Sangareddy, Telangana 502285, India
| | - Swati Mohanty
- Indian Institute of Technology Hyderabad, Kandi, Sangareddy, Telangana 502285, India
| | - Vallepu Mohan Sai
- Indian Institute of Technology Hyderabad, Kandi, Sangareddy, Telangana 502285, India
| | - Tushant Agrawal
- Indian Institute of Technology Hyderabad, Kandi, Sangareddy, Telangana 502285, India
| | | | - Madhuri Taranikanti
- All India Institute of Medical Sciences, Bibinagar, Hyderabad, Telangana 508126, India
| | - Rajiv Bandaru
- ESIC Medical College, S R Nagar, Hyderabad, Telangana 500038, India
| | | | - Lakshmi Jyothi Tadi
- All India Institute of Medical Sciences, Bibinagar, Hyderabad, Telangana 508126, India.,ESIC Medical College, S R Nagar, Hyderabad, Telangana 500038, India
| | - Swathi Suravaram
- ESIC Medical College, S R Nagar, Hyderabad, Telangana 500038, India
| | | | - Srinivas Maddur
- ESIC Medical College, S R Nagar, Hyderabad, Telangana 500038, India
| | | | - Ranjana Singh
- Indian Institute of Technology Hyderabad, Kandi, Sangareddy, Telangana 502285, India
| | - Vikrant Singh
- School of Medicine, University of California, 1 Shields Avenue, Davis, California 95616, United States
| | - Shiv Govind Singh
- Indian Institute of Technology Hyderabad, Kandi, Sangareddy, Telangana 502285, India
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Supraja P, Tripathy S, Singh R, Singh V, Chaudhury G, Singh SG. Towards point-of-care diagnosis of Alzheimer's disease: Multi-analyte based portable chemiresistive platform for simultaneous detection of β-amyloid (1-40) and (1-42) in plasma. Biosens Bioelectron 2021; 186:113294. [PMID: 33971525 DOI: 10.1016/j.bios.2021.113294] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2021] [Revised: 04/11/2021] [Accepted: 04/28/2021] [Indexed: 01/05/2023]
Abstract
Label-free simultaneous detection of Alzheimer's disease (AD) specific biomarkers Aβ40 and Aβ42 peptides on a single platform using polypyrrole nanoparticle-based chemiresistive biosensors is reported here. The proposed interdigitated-microelectrode based inexpensive multisensor-platform can concurrently detect Aβ40 and Aβ42 in spiked-plasma in the range of 10-14 - 10-6 g/mL (with LoDs being 5.71 and 9.09 fg/mL, respectively), enabling the estimation of diagnostically significant Aβ42/Aβ40 ratio. A detailed study has been undertaken here to record the individual sensor responses against spiked-plasma samples with varying amounts and proportions of the two target peptides, towards enabling disease-progression monitoring using the Aβ-ratio. As compared to the existing cost-ineffective brain-imaging techniques such as PET and MRI, and the high-risk CSF based invasive AD biomarkers detecting procedures, the proposed approach offers a viable alternative for affordable point-of-care AD diagnostics, with possible usage in performance evaluation of therapeutic drugs. Towards point-of-care applications, the portable readout used in this work was conjugated with an android-based mobile app for data-acquisition and analysis.
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Affiliation(s)
- Patta Supraja
- Department of Electrical Engineering, Indian Institute of Technology Hyderabad, 502285, India.
| | - Suryasnata Tripathy
- Department of Electrical Engineering, Indian Institute of Technology Hyderabad, 502285, India.
| | - Ranjana Singh
- Department of Electrical Engineering, Indian Institute of Technology Hyderabad, 502285, India.
| | - Vikrant Singh
- School of Medicine, University of California Davis, USA.
| | - Gajendranath Chaudhury
- Department of Electrical Engineering, Indian Institute of Technology Hyderabad, 502285, India.
| | - Shiv Govind Singh
- Department of Electrical Engineering, Indian Institute of Technology Hyderabad, 502285, India.
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5
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Sedki M, Shen Y, Mulchandani A. Nano-FET-enabled biosensors: Materials perspective and recent advances in North America. Biosens Bioelectron 2021; 176:112941. [DOI: 10.1016/j.bios.2020.112941] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Revised: 12/24/2020] [Accepted: 12/26/2020] [Indexed: 02/06/2023]
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6
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Khoder R, Korri-Youssoufi H. E-DNA biosensors of M. tuberculosis based on nanostructured polypyrrole. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 108:110371. [DOI: 10.1016/j.msec.2019.110371] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Revised: 10/15/2019] [Accepted: 10/27/2019] [Indexed: 01/20/2023]
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Chemiresistive DNA hybridization sensor with electrospun nanofibers: A method to minimize inter-device variability. Biosens Bioelectron 2019; 133:24-31. [DOI: 10.1016/j.bios.2019.03.031] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Revised: 03/02/2019] [Accepted: 03/17/2019] [Indexed: 02/08/2023]
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Koo B, Yorita AM, Schmidt JJ, Monbouquette HG. Amplification-free, sequence-specific 16S rRNA detection at 1 aM. LAB ON A CHIP 2018; 18:2291-2299. [PMID: 29987290 DOI: 10.1039/c8lc00452h] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
A nucleic acid amplification-free, optics-free platform has been demonstrated for sequence-specific detection of Escherichia coli (E. coli) 16S rRNA at 1 aM (10-18 M) against a 106-fold (1 pM) background of Pseudomonas putida (P. putida) RNA. This work was driven by the need for simple, rapid, and low cost means for species-specific bacterial detection at low concentration. Our simple, conductometric sensing device functioned by detecting blockage of a nanopore fabricated in a sub-micron-thick glass membrane. Upon sequence-specific binding of target 16S rRNA, otherwise charge-neutral, PNA oligonucleotide probe-polystyrene bead conjugates become electrophoretically mobile and are driven to the glass nanopore of lesser diameter, which is blocked, thereby generating a large, sustained and readily observable step decrease in ionic current. No false positive signals were observed with P. putida RNA when this device was configured to detect E. coli 16S rRNA. Also, when a universal PNA probe complementary to the 16S rRNA of both E. coli and P. putida was conjugated to beads, a positive response to rRNA of both bacterial species was observed. Finally, the device readily detected E. coli at 10 CFU mL-1 in a 1 mL sample, also against a million-fold background of viable P. putida. These results suggest that this new device may serve as the basis for small, portable, low power, and low-cost systems for rapid detection of specific bacterial species in clinical samples, food, and water.
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Affiliation(s)
- Bonhye Koo
- Chemical and Biomolecular Engineering Department, University of California, Los Angeles, Los Angeles, CA 90095, USA.
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10
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Ahmad R, Mahmoudi T, Ahn MS, Hahn YB. Recent advances in nanowires-based field-effect transistors for biological sensor applications. Biosens Bioelectron 2018; 100:312-325. [PMID: 28942344 PMCID: PMC7126762 DOI: 10.1016/j.bios.2017.09.024] [Citation(s) in RCA: 85] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2017] [Revised: 09/08/2017] [Accepted: 09/14/2017] [Indexed: 12/29/2022]
Abstract
Nanowires (NWs)-based field-effect transistors (FETs) have attracted considerable interest to develop innovative biosensors using NWs of different materials (i.e. semiconductors, polymers, etc.). NWs-based FETs provide significant advantages over the other bulk or non-NWs nanomaterials-based FETs. As the building blocks for FET-based biosensors, one-dimensional NWs offer excellent surface-to-volume ratio and are more suitable and sensitive for sensing applications. During the past decade, FET-based biosensors are smartly designed and used due to their great specificity, sensitivity, and high selectivity. Additionally, they have the advantage of low weight, low cost of mass production, small size and compatible with commercial planar processes for large-scale circuitry. In this respect, we summarize the recent advances of NWs-based FET biosensors for different biomolecule detection i.e. glucose, cholesterol, uric acid, urea, hormone, proteins, nucleotide, biomarkers, etc. A comparative sensing performance, present challenges, and future prospects of NWs-based FET biosensors are discussed in detail.
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Affiliation(s)
- Rafiq Ahmad
- School of Semiconductor and Chemical Engineering, Nanomaterials Processing Research Center, Chonbuk National University, 567 Baekjedaero, Deokjin-gu, Jeonju-si, Jeollabuk-do 54896, Republic of Korea.
| | - Tahmineh Mahmoudi
- School of Semiconductor and Chemical Engineering, Nanomaterials Processing Research Center, Chonbuk National University, 567 Baekjedaero, Deokjin-gu, Jeonju-si, Jeollabuk-do 54896, Republic of Korea
| | - Min-Sang Ahn
- School of Semiconductor and Chemical Engineering, Nanomaterials Processing Research Center, Chonbuk National University, 567 Baekjedaero, Deokjin-gu, Jeonju-si, Jeollabuk-do 54896, Republic of Korea
| | - Yoon-Bong Hahn
- School of Semiconductor and Chemical Engineering, Nanomaterials Processing Research Center, Chonbuk National University, 567 Baekjedaero, Deokjin-gu, Jeonju-si, Jeollabuk-do 54896, Republic of Korea.
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11
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Zhu B, Travas-Sejdic J. PNA versus DNA in electrochemical gene sensing based on conducting polymers: study of charge and surface blocking effects on the sensor signal. Analyst 2018; 143:687-694. [PMID: 29297913 DOI: 10.1039/c7an01590a] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
In this communication, we present an in-depth study of DNA/DNA, DNA/PNA and PNA/PNA hybridisation on a conducting polymer-modified electrode, measured by means of electrochemical impedance spectroscopy (EIS). DNA or PNA nucleic base sequence probes (where DNA stands for deoxyribonucleic acid and PNA for peptide nucleic acid) were covalently attached onto the sensor surface. As PNA is a non-charged variant of DNA, we investigate the effects of the surface charge and surface blocking by the surface confined probe/target nucleic bases complexes onto the kinetics of redox reaction of Fe(CN)63-/4- couple occurring at the electrode/solution interface that provides electrochemical readout for hybridisation. A range of hybridisation detection experiments were performed, where the surface charge and surface charge density were varied, through varying the charged nature of the probe and the target (i.e. PNA or DNA) and the density of surface-bound PNA and DNA probes. To further the understanding of these effects on the measured electrochemical signal, kinetic studies of the hybridisation reactions were undertaken, and the equilibrium binding constants and binding rate constants for the hybridisation reactions were obtained. The study provides valuable insights to guide future designs of biosensors.
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Affiliation(s)
- Bicheng Zhu
- Polymer Electronics Research Centre, School of Chemical Sciences, University of Auckland, 23 Symonds Street, Auckland, New Zealand. and The MacDiarmid Institute for Advanced Materials and Nanotechnology, New Zealand
| | - Jadranka Travas-Sejdic
- Polymer Electronics Research Centre, School of Chemical Sciences, University of Auckland, 23 Symonds Street, Auckland, New Zealand. and The MacDiarmid Institute for Advanced Materials and Nanotechnology, New Zealand
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12
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Analysis of the evolution of the detection limits of electrochemical nucleic acid biosensors II. Anal Bioanal Chem 2017; 409:4335-4352. [DOI: 10.1007/s00216-017-0377-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Revised: 04/11/2017] [Accepted: 04/21/2017] [Indexed: 01/07/2023]
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13
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Rahman S, Yusof N, Hashim U, Hushiarian R, M.N. MN, Hamidon M, Zawawi R, Fathil M. Enhanced sensing of dengue virus DNA detection using O2 plasma treated-silicon nanowire based electrical biosensor. Anal Chim Acta 2016; 942:74-85. [DOI: 10.1016/j.aca.2016.09.009] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Revised: 09/05/2016] [Accepted: 09/06/2016] [Indexed: 11/27/2022]
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14
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White SP, Sreevatsan S, Frisbie CD, Dorfman KD. Rapid, Selective, Label-Free Aptameric Capture and Detection of Ricin in Potable Liquids Using a Printed Floating Gate Transistor. ACS Sens 2016. [DOI: 10.1021/acssensors.6b00481] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Scott P. White
- Department
of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Srinand Sreevatsan
- Veterinary
Population Medicine, University of Minnesota, St. Paul, Minnesota 55108, United States
| | - C. Daniel Frisbie
- Department
of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Kevin D. Dorfman
- Department
of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
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15
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Esfandiari L, Wang S, Wang S, Banda A, Lorenzini M, Kocharyan G, Monbouquette HG, Schmidt JJ. PCR-Independent Detection of Bacterial Species-Specific 16S rRNA at 10 fM by a Pore-Blockage Sensor. BIOSENSORS-BASEL 2016; 6:bios6030037. [PMID: 27455337 PMCID: PMC5039656 DOI: 10.3390/bios6030037] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Revised: 07/08/2016] [Accepted: 07/15/2016] [Indexed: 11/16/2022]
Abstract
A PCR-free, optics-free device is used for the detection of Escherichia coli (E. coli) 16S rRNA at 10 fM, which corresponds to ~100-1000 colony forming units/mL (CFU/mL) depending on cellular rRNA levels. The development of a rapid, sensitive, and cost-effective nucleic acid detection platform is sought for the detection of pathogenic microbes in food, water and body fluids. Since 16S rRNA sequences are species specific and are present at high copy number in viable cells, these nucleic acids offer an attractive target for microbial pathogen detection schemes. Here, target 16S rRNA of E. coli at 10 fM concentration was detected against a total RNA background using a conceptually simple approach based on electromechanical signal transduction, whereby a step change reduction in ionic current through a pore indicates blockage by an electrophoretically mobilized bead-peptide nucleic acid probe conjugate hybridized to target nucleic acid. We investigated the concentration detection limit for bacterial species-specific 16S rRNA at 1 pM to 1 fM and found a limit of detection of 10 fM for our device, which is consistent with our previous finding with single-stranded DNA of similar length. In addition, no false positive responses were obtained with control RNA and no false negatives with target 16S rRNA present down to the limit of detection (LOD) of 10 fM. Thus, this detection scheme shows promise for integration into portable, low-cost systems for rapid detection of pathogenic microbes in food, water and body fluids.
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Affiliation(s)
- Leyla Esfandiari
- Department of Bioengineering, University of California, Los Angeles, CA 90095, USA.
| | - Siqing Wang
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA.
| | - Siqi Wang
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, CA 90095, USA.
| | - Anisha Banda
- Department of Bioengineering, University of California, Los Angeles, CA 90095, USA.
| | - Michael Lorenzini
- Department of Bioengineering, University of California, Los Angeles, CA 90095, USA.
| | - Gayane Kocharyan
- Department of Bioengineering, University of California, Los Angeles, CA 90095, USA.
| | - Harold G Monbouquette
- Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, CA 90095, USA.
| | - Jacob J Schmidt
- Department of Bioengineering, University of California, Los Angeles, CA 90095, USA.
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Wasim F, Mahmood T, Ayub K. An accurate cost effective DFT approach to study the sensing behaviour of polypyrrole towards nitrate ions in gas and aqueous phases. Phys Chem Chem Phys 2016; 18:19236-47. [DOI: 10.1039/c6cp02271e] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A variety of low cost computational methods are evaluated to accurately calculate the interaction energy between polypyrrole and nitrate ions.
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Affiliation(s)
- Fatima Wasim
- Department of Chemistry
- COMSATS Institute of Information Technology
- Abbottabad
- Pakistan
| | - Tariq Mahmood
- Department of Chemistry
- COMSATS Institute of Information Technology
- Abbottabad
- Pakistan
| | - Khurshid Ayub
- Department of Chemistry
- COMSATS Institute of Information Technology
- Abbottabad
- Pakistan
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17
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Zribi B, Roy E, Pallandre A, Chebil S, Koubaa M, Mejri N, Magdinier Gomez H, Sola C, Korri-Youssoufi H, Haghiri-Gosnet AM. A microfluidic electrochemical biosensor based on multiwall carbon nanotube/ferrocene for genomic DNA detection of Mycobacterium tuberculosis in clinical isolates. BIOMICROFLUIDICS 2016; 10:014115. [PMID: 26865908 PMCID: PMC4744232 DOI: 10.1063/1.4940887] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2015] [Accepted: 01/14/2016] [Indexed: 05/20/2023]
Abstract
Herein we present a microfluidic-multiplexed platform that integrates electrochemical sensors based on carbon nanotubes associated with ferrocene as redox marker (carbon nanotube (CNT)/ferrocene) for direct detection of pathogenic viral DNA from Hepatitis C and genomic DNA from Mycobacterium tuberculosis in clinical isolates. By operating the fluidic device under high flow (150 μl/min), the formation of a very thin depletion layer at the sensor surface (δS = 230 nm) enhances the capture rate up to one DNA strand per second. By comparison, this capture rate is only 0.02 molecule/s in a static regime without flow. This fluidic protocol allows thus enhancing the limit of detection of the electrochemical biosensor from picomolar in bulk solution to femtomolar with a large dynamic range from 0.1 fM to 1 pM. Kinetics analysis also demonstrates an enhancement of the rate constant of electron transfer (kS) of the electrochemical process from 1 s(-1) up to 6 s(-1) thanks to the geometry of the miniaturized fluidic electrochemical cell. This microfluidic device working under high flow allows selective direct detection of a Mycobacterium tuberculosis (H37Rv) rpoB allele from clinical isolate extracted DNA. We envision that a microfluidic approach under high flow associated with a multiwall CNT/ferrocene sensor could find useful applications as the point-of-care for multi-target diagnostics of biomarkers in real samples.
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Affiliation(s)
| | - E Roy
- Laboratoire de Photonique et de Nanostructures (LPN), CNRS, Université Paris-Saclay , route de Nozay, F-91460 Marcoussis, France
| | | | - S Chebil
- Laboratoire de Photonique et de Nanostructures (LPN), CNRS, Université Paris-Saclay , route de Nozay, F-91460 Marcoussis, France
| | - M Koubaa
- Laboratoire de Physique des Matériaux, LPM FSS, Faculté des Sciences de Sfax, Université de Sfax , Sfax, Tunisia
| | - N Mejri
- Université Paris-Saclay , UMR-CNRS 8182, Institue de Chimie Moléculaires et Matériaux d'Orsay (ICMMO), Equipe de Chimie Bioorganique et Bioinorganique (ECBB), Bâtiment 420, 91405, Orsay, France
| | - H Magdinier Gomez
- UMR-CNRS 9198, Institut de Biologie Intégrative de la Cellule (I2BC), Université Paris-Saclay , Bat 400, 91405 Orsay, France
| | - C Sola
- UMR-CNRS 9198, Institut de Biologie Intégrative de la Cellule (I2BC), Université Paris-Saclay , Bat 400, 91405 Orsay, France
| | - H Korri-Youssoufi
- Université Paris-Saclay , UMR-CNRS 8182, Institue de Chimie Moléculaires et Matériaux d'Orsay (ICMMO), Equipe de Chimie Bioorganique et Bioinorganique (ECBB), Bâtiment 420, 91405, Orsay, France
| | - A-M Haghiri-Gosnet
- Laboratoire de Photonique et de Nanostructures (LPN), CNRS, Université Paris-Saclay , route de Nozay, F-91460 Marcoussis, France
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18
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Bridle H, Balharry D, Gaiser B, Johnston H. Exploitation of Nanotechnology for the Monitoring of Waterborne Pathogens: State-of-the-Art and Future Research Priorities. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:10762-77. [PMID: 26301863 DOI: 10.1021/acs.est.5b01673] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Contaminated drinking water is one of the most important environmental contributors to the human disease burden. Monitoring of water for the presence of pathogens is an essential part of ensuring drinking water safety. In order to assess water quality it is essential to have methods available to sample and detect the type, level and viability of pathogens in water which are effective, cheap, quick, sensitive, and where possible high throughput. Nanotechnology has the potential to drastically improve the monitoring of waterborne pathogens when compared to conventional approaches. To date, there have been no reviews that outline the applications of nanotechnology in this area despite increasing exploitation of nanotechnology for this purpose. This review is therefore the first overview of the state-of-the-art in the application of nanotechnology to waterborne pathogen sampling and detection schemes. Research in this field has been centered on the use of engineered nanomaterials. The effectiveness and limitations of nanomaterial-based approaches is outlined. A future outlook of the advances that are likely to emerge in this area, as well as recommendations for areas of further research are provided.
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Affiliation(s)
- Helen Bridle
- Institute of Biological Chemistry, Biophysics and Bioengineering, Heriot-Watt University , Riccarton, Edinburgh, EH14 4AS, United Kingdom
| | - Dominique Balharry
- School of Life Sciences, Heriot-Watt University , Riccarton, Edinburgh, EH14 4AS, United Kingdom
- Centre for Genomics and Experimental Medicine, Institute of Genetics and Molecular Medicine, University of Edinburgh , Western General Hospital, Crewe Road, Edinburgh, EH4 2XU, United Kingdom
| | - Birgit Gaiser
- School of Life Sciences, Heriot-Watt University , Riccarton, Edinburgh, EH14 4AS, United Kingdom
| | - Helinor Johnston
- School of Life Sciences, Heriot-Watt University , Riccarton, Edinburgh, EH14 4AS, United Kingdom
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19
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Zaffino RL, Galan T, Pardo WA, Mir M, Samitier J. Nanoprobes for enhanced electrochemical DNA sensors. WILEY INTERDISCIPLINARY REVIEWS-NANOMEDICINE AND NANOBIOTECHNOLOGY 2015; 7:817-27. [DOI: 10.1002/wnan.1344] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2015] [Accepted: 03/07/2015] [Indexed: 11/05/2022]
Affiliation(s)
- Rosa Letizia Zaffino
- Nanobioengineering Laboratory; Institute for Bioengineering of Catalonia (IBEC); Barcelona Spain
- Department of Electronics; Barcelona University (UB); Barcelona Spain
| | - Teresa Galan
- Nanobioengineering Laboratory; Institute for Bioengineering of Catalonia (IBEC); Barcelona Spain
- Department of Electronics; Barcelona University (UB); Barcelona Spain
| | - Wilmer Alfonso Pardo
- Nanobioengineering Laboratory; Institute for Bioengineering of Catalonia (IBEC); Barcelona Spain
- Department of Electronics; Barcelona University (UB); Barcelona Spain
| | - Mònica Mir
- Nanobioengineering Laboratory; Institute for Bioengineering of Catalonia (IBEC); Barcelona Spain
- Centro de Investigación Biomédica en Red de Bioingeniería; Biomateriales y Nanomedicina (CIBER-BBN); Zaragoza Spain
| | - Josep Samitier
- Nanobioengineering Laboratory; Institute for Bioengineering of Catalonia (IBEC); Barcelona Spain
- Department of Electronics; Barcelona University (UB); Barcelona Spain
- Centro de Investigación Biomédica en Red de Bioingeniería; Biomateriales y Nanomedicina (CIBER-BBN); Zaragoza Spain
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20
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Rahman MM, Li XB, Lopa NS, Ahn SJ, Lee JJ. Electrochemical DNA hybridization sensors based on conducting polymers. SENSORS (BASEL, SWITZERLAND) 2015; 15:3801-29. [PMID: 25664436 PMCID: PMC4367386 DOI: 10.3390/s150203801] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/29/2014] [Accepted: 01/27/2015] [Indexed: 02/07/2023]
Abstract
Conducting polymers (CPs) are a group of polymeric materials that have attracted considerable attention because of their unique electronic, chemical, and biochemical properties. This is reflected in their use in a wide range of potential applications, including light-emitting diodes, anti-static coating, electrochromic materials, solar cells, chemical sensors, biosensors, and drug-release systems. Electrochemical DNA sensors based on CPs can be used in numerous areas related to human health. This review summarizes the recent progress made in the development and use of CP-based electrochemical DNA hybridization sensors. We discuss the distinct properties of CPs with respect to their use in the immobilization of probe DNA on electrode surfaces, and we describe the immobilization techniques used for developing DNA hybridization sensors together with the various transduction methods employed. In the concluding part of this review, we present some of the challenges faced in the use of CP-based DNA hybridization sensors, as well as a future perspective.
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Affiliation(s)
- Md Mahbubur Rahman
- Nanotechnology Research Center and Department of Applied Life Science, College of Biomedical and Health Science, Konkuk University, Chungju 380-701, Korea.
| | - Xiao-Bo Li
- Nanotechnology Research Center and Department of Applied Life Science, College of Biomedical and Health Science, Konkuk University, Chungju 380-701, Korea.
| | - Nasrin Siraj Lopa
- Nanotechnology Research Center and Department of Applied Life Science, College of Biomedical and Health Science, Konkuk University, Chungju 380-701, Korea.
| | - Sang Jung Ahn
- Center for Advanced Instrumentation, Korea Research Institute of Standards and Science (KRISS), Daejeon 305-340, Korea.
| | - Jae-Joon Lee
- Nanotechnology Research Center and Department of Applied Life Science, College of Biomedical and Health Science, Konkuk University, Chungju 380-701, Korea.
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21
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Esfandiari L, Lorenzini M, Kocharyan G, Monbouquette HG, Schmidt JJ. Sequence-specific DNA detection at 10 fM by electromechanical signal transduction. Anal Chem 2014; 86:9638-43. [PMID: 25203740 PMCID: PMC4188267 DOI: 10.1021/ac5021408] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Target DNA fragments at 10 fM concentration (approximately 6 × 10(5) molecules) were detected against a DNA background simulating the noncomplementary genomic DNA present in real samples using a simple, PCR-free, optics-free approach based on electromechanical signal transduction. The development of a rapid, sensitive, and cost-effective nucleic acid detection platform is highly desired for a range of diverse applications. We previously described a potentially low-cost device for sequence-specific nucleic acid detection based on conductance change measurement of a pore blocked by electrophoretically mobilized bead-(peptide nucleic acid probe) conjugates upon hybridization with target nucleic acid. Here, we demonstrate the operation of our device with longer DNA targets, and we describe the resulting improvement in the limit of detection (LOD). We investigated the detection of DNA oligomers of 110, 235, 419, and 1613 nucleotides at 1 pM to 1 fM and found that the LOD decreased as DNA length increased, with 419 and 1613 nucleotide oligomers detectable down to 10 fM. In addition, no false positive responses were obtained with noncomplementary, control DNA fragments of similar length. The 1613-base DNA oligomer is similar in size to 16S rRNA, which suggests that our device may be useful for detection of pathogenic bacteria at clinically relevant concentrations based on recognition of species-specific 16S rRNA sequences.
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Affiliation(s)
- Leyla Esfandiari
- Department of Bioengineering, University of California, Los Angeles , Los Angeles, California 90095, United States
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22
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Travas-Sejdic J, Aydemir N, Kannan B, Williams DE, Malmström J. Intrinsically conducting polymer nanowires for biosensing. J Mater Chem B 2014; 2:4593-4609. [DOI: 10.1039/c4tb00598h] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The fabrication of conductive polymer nanowires and their sensing of nucleic acids, proteins and pathogens is reviewed in this feature article.
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Affiliation(s)
- J. Travas-Sejdic
- School of Chemical Sciences
- University of Auckland
- Auckland 1142, New Zealand
- MacDiarmid Institute for Advanced Materials and Nanotechnology
- Wellington 6140, New Zealand
| | - N. Aydemir
- School of Chemical Sciences
- University of Auckland
- Auckland 1142, New Zealand
- MacDiarmid Institute for Advanced Materials and Nanotechnology
- Wellington 6140, New Zealand
| | - B. Kannan
- Revolution Fibres Ltd
- , New Zealand
- School of Chemical Sciences
- University of Auckland
- Auckland 1142, New Zealand
| | - D. E. Williams
- School of Chemical Sciences
- University of Auckland
- Auckland 1142, New Zealand
- MacDiarmid Institute for Advanced Materials and Nanotechnology
- Wellington 6140, New Zealand
| | - J. Malmström
- School of Chemical Sciences
- University of Auckland
- Auckland 1142, New Zealand
- MacDiarmid Institute for Advanced Materials and Nanotechnology
- Wellington 6140, New Zealand
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24
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Dash SK, Sharma M, Khare S, Kumar A. rmpM Genosensor for Detection of Human Brain Bacterial Meningitis in Cerebrospinal Fluid. Appl Biochem Biotechnol 2013; 171:198-208. [DOI: 10.1007/s12010-013-0339-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2013] [Accepted: 06/17/2013] [Indexed: 11/29/2022]
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25
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Senveli SU, Tigli O. Biosensors in the small scale: methods and technology trends. IET Nanobiotechnol 2013; 7:7-21. [PMID: 23705288 DOI: 10.1049/iet-nbt.2012.0005] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
This study presents a review on biosensors with an emphasis on recent developments in the field. A brief history accompanied by a detailed description of the biosensor concepts is followed by rising trends observed in contemporary micro- and nanoscale biosensors. Performance metrics to quantify and compare different detection mechanisms are presented. A comprehensive analysis on various types and subtypes of biosensors are given. The fields of interest within the scope of this review are label-free electrical, mechanical and optical biosensors as well as other emerging and popular technologies. Especially, the latter half of the last decade is reviewed for the types, methods and results of the most prominently researched detection mechanisms. Tables are provided for comparison of various competing technologies in the literature. The conclusion part summarises the noteworthy advantages and disadvantages of all biosensors reviewed in this study. Furthermore, future directions that the micro- and nanoscale biosensing technologies are expected to take are provided along with the immediate outlook.
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Affiliation(s)
- Sukru U Senveli
- Department of Electrical and Computer Engineering, University of Miami, Coral Gables, FL 33146, USA
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26
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Leiterer C, Seise B, Slowik I, Brönstrup G, Niepelt R, Weber K, Ronning C, Christiansen S, Fritzsche W. DNA hybridization assay at individual, biofunctionalized zinc oxide nanowires. JOURNAL OF BIOPHOTONICS 2013; 6:143-147. [PMID: 22505022 DOI: 10.1002/jbio.201200023] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2012] [Revised: 03/15/2012] [Accepted: 03/16/2012] [Indexed: 05/31/2023]
Abstract
Reliable and efficient identification of DNA is a major goal in on-site diagnostics. One dimensional nanostructures like nanowires (NW) represent potential sensor structures due to their extreme surface-to-bulk ratio, enabling enhanced biomolecule binding which results in optimal signals. While silicon NW are already well studied, NW made from other materials with promising properties like ZnO are not yet established as NW sensor material for bioanalytics. Here we demonstrate the DNA functionalization of ZnO NW even at the single NW level and their successful application in a DNA hybridization assay.
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Affiliation(s)
- Christian Leiterer
- Institute of Photonic Technology, Albert-Einstein-Straße 9, 07745 Jena, Germany.
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27
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Park HW, Kim T, Huh J, Kang M, Lee JE, Yoon H. Anisotropic growth control of polyaniline nanostructures and their morphology-dependent electrochemical characteristics. ACS NANO 2012; 6:7624-7633. [PMID: 22900544 DOI: 10.1021/nn3033425] [Citation(s) in RCA: 120] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Polyaniline (PANI) is one of the most widely investigated conducting polymers and is considered to be of practical use for many future applications. Here, we first demonstrate that the anisotropic growth of PANI at the nanometer scale can be kinetically controlled by employing a polymeric stabilizer, poly(N-vinylpyrrolidone). The polymerization rate became slower in the presence of the stabilizer (the rate constants calculated at the initial stage decreased with increasing concentration of the stabilizer), yielding PANI nanostructures with lower aspect ratios. Therefore, it is believed that the stabilizer sterically restricts the directional fiber growth mechanism governing PANI chain growth in aqueous solution. Three PANI nanostructures, specifically nanospheres, nanorods, and nanofibers, were fabricated and their oxidation/protonation levels were investigated systematically. It was found that the nanofibers had the most outstanding oxidation/protonation level accompanied by structural ordering (note that the only difference between the polymerization conditions in each case was the concentration of the stabilizer). We also examine the electrochemical properties of PANI nanostructure electrodes in three-electrode and two-electrode (actual capacitor cell) configurations. The intrinsic charge-transport ability of individual nanostructures strongly affected the electrochemical properties of the electrodes. Briefly, the nanofiber electrode had faster electrode kinetics and better capacitance than the nanorods and nanospheres. Lastly, an extrinsic factor, the interparticle contact resistance, also turned out to noticeably influence the capacitances of the electrodes.
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Affiliation(s)
- Hyun-Woo Park
- Alan G MacDiarmid Energy Research Institute, Department of Polymer and Fiber System Engineering, Chonnam National University, Gwangju 500-757, South Korea
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Kannan B, Williams DE, Laslau C, Travas-Sejdic J. A highly sensitive, label-free gene sensor based on a single conducting polymer nanowire. Biosens Bioelectron 2012; 35:258-264. [DOI: 10.1016/j.bios.2012.02.058] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2012] [Revised: 02/26/2012] [Accepted: 02/27/2012] [Indexed: 01/17/2023]
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29
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Akhavan O, Ghaderi E, Rahighi R. Toward single-DNA electrochemical biosensing by graphene nanowalls. ACS NANO 2012; 6:2904-16. [PMID: 22385391 DOI: 10.1021/nn300261t] [Citation(s) in RCA: 284] [Impact Index Per Article: 23.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Graphene oxide nanowalls with extremely sharp edges and preferred vertical orientation were deposited on a graphite electrode by using electrophoretic deposition in an Mg(2+)-GO electrolyte. Using differential pulse voltammetry (DPV), reduced graphene nanowalls (RGNWs) were applied for the first time, in developing an ultra-high-resolution electrochemical biosensor for detection of the four bases of DNA (G, A, T, and C) by monitoring the oxidation signals of the individual nucleotide bases. The extremely enhanced electrochemical reactivity of the four free bases of DNA, single-stranded DNA, and double-stranded DNA (dsDNA) at the surface of the RGNW electrode was compared to electrochemical performances of reduced graphene nanosheet (RGNS), graphite, and glassy carbon electrodes. By increasing the number of DPVs up to 100 scans, the RGNW electrode exhibited an excellent stability with only 15% variation in the oxidation signals, while for the RGNS electrode no detectable signals relating to T and C of 0.1 μM dsDNA were observed. The linear dynamic detection range of the RGNW electrode for dsDNA was checked in the wide range of 0.1 fM to 10 mM, while for the RGNS electrode, it was from 2.0 pM to <10 mM. The lower limits of dsDNA detection of the RGNW and RGNS electrodes were estimated as 9.4 zM (∼5 dsDNA/mL) and 5.4 fM, respectively. The RGNWs were efficient in label-free detection of single nucleotide polymorphisms of 20 zM oligonucleotides (∼10 DNA/mL) having a specific sequence. Therefore, the RGNWs can effectively contribute to the development of ultra-high-sensitive electrochemical biosensors with single-DNA resolutions.
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Affiliation(s)
- Omid Akhavan
- Department of Physics, Sharif University of Technology, P.O. Box 11155-9161, Tehran, Iran.
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30
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Arter JA, Diaz JE, Donavan KC, Yuan T, Penner RM, Weiss GA. Virus-polymer hybrid nanowires tailored to detect prostate-specific membrane antigen. Anal Chem 2012; 84:2776-83. [PMID: 22339784 DOI: 10.1021/ac203143y] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We demonstrate the de novo fabrication of a biosensor, based upon virus-containing poly(3,4-ethylene-dioxythiophene) (PEDOT) nanowires, that detects prostate-specific membrane antigen (PSMA). This development process occurs in three phases: (1) isolation of a M13 virus with a displayed polypeptide receptor, from a library of ≈10(11) phage-displayed peptides, which binds PSMA with high affinity and selectivity, (2) microfabrication of PEDOT nanowires that entrain these virus particles using the lithographically patterned nanowire electrodeposition (LPNE) method, and (3) electrical detection of the PSMA in high ionic strength (150 mM salt) media, including synthetic urine, using an array of virus-PEDOT nanowires with the electrical resistance of these nanowires for transduction. The electrical resistance of an array of these nanowires increases linearly with the PSMA concentration from 20 to 120 nM in high ionic strength phosphate-buffered fluoride (PBF) buffer, yielding a limit of detection (LOD) for PSMA of 56 nM.
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Affiliation(s)
- Jessica A Arter
- Department of Chemistry, University of California, Irvine, California 92697-2025, United States
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31
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Mazloum-Ardakani M, Sheikh-Mohseni MA, Benvidi A. Electropolymerization of Thin Film Conducting Polymer and Its Application for Simultaneous Determination of Ascorbic Acid, Dopamine and Uric Acid. ELECTROANAL 2011. [DOI: 10.1002/elan.201100289] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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32
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Conducting polymer nanowires-based label-free biosensors. Curr Opin Biotechnol 2011; 22:502-8. [DOI: 10.1016/j.copbio.2011.05.508] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2011] [Revised: 05/17/2011] [Accepted: 05/18/2011] [Indexed: 12/29/2022]
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