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RaviChandran N, Teo MY, McDaid A, Aw K. Conformable Electrode Arrays for Wearable Neuroprostheses. SENSORS (BASEL, SWITZERLAND) 2023; 23:2982. [PMID: 36991692 PMCID: PMC10054495 DOI: 10.3390/s23062982] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/06/2023] [Revised: 03/03/2023] [Accepted: 03/07/2023] [Indexed: 06/19/2023]
Abstract
Wearable electrode arrays can selectively stimulate muscle groups by modulating their shape, size, and position over a targeted region. They can potentially revolutionize personalized rehabilitation by being noninvasive and allowing easy donning and doffing. Nevertheless, users should feel comfortable using such arrays, as they are typically worn for an extended time period. Additionally, to deliver safe and selective stimulation, these arrays must be tailored to a user's physiology. Fabricating customizable electrode arrays needs a rapid and economical technique that accommodates scalability. By leveraging a multilayer screen-printing technique, this study aims to develop personalizable electrode arrays by embedding conductive materials into silicone-based elastomers. Accordingly, the conductivity of a silicone-based elastomer was altered by adding carbonaceous material. The 1:8 and 1:9 weight ratio percentages of carbon black (CB) to elastomer achieved conductivities between 0.0021-0.0030 S cm-1 and were suitable for transcutaneous stimulation. Moreover, these ratios maintained their stimulation performance after several stretching cycles of up to 200%. Thus, a soft, conformable electrode array with a customizable design was demonstrated. Lastly, the efficacy of the proposed electrode arrays to stimulate hand function tasks was evaluated by in vivo experiments. The demonstration of such arrays encourages the realization of cost-effective, wearable stimulation systems for hand function restoration.
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Affiliation(s)
- Narrendar RaviChandran
- Medical Devices and Technologies Group, Department of Mechanical and Mechatronics Engineering, The University of Auckland, Auckland 1010, New Zealand
- Singapore Eye Research Institute, Singapore 169856, Singapore
| | - Mei Ying Teo
- Smart Materials and Microtechnologies Group, Department of Mechanical and Mechatronics Engineering, The University of Auckland, Auckland 1010, New Zealand
| | - Andrew McDaid
- Medical Devices and Technologies Group, Department of Mechanical and Mechatronics Engineering, The University of Auckland, Auckland 1010, New Zealand
| | - Kean Aw
- Smart Materials and Microtechnologies Group, Department of Mechanical and Mechatronics Engineering, The University of Auckland, Auckland 1010, New Zealand
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2
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Screen-printed electrochemical sensors for environmental monitoring of heavy metal ion detection. REV CHEM ENG 2022. [DOI: 10.1515/revce-2022-0002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract
Heavy metal ions (HMIs) are known to cause severe damages to the human body and ecological environment. And considering the current alarming situation, it is crucial to develop a rapid, sensitive, robust, economical and convenient method for their detection. Screen printed electrochemical technology contributes greatly to this task, and has achieved global attention. It enabled the mass transmission rate and demonstrated ability to control the chemical nature of the measure media. Besides, the technique offers advantages like linear output, quick response, high selectivity, sensitivity and stability along with low power requirement and high signal-to-noise ratio. Recently, the performance of SPEs has been improved employing the most effective and promising method of the incorporation of different nanomaterials into SPEs. Especially, in electrochemical sensors, the incorporation of nanomaterials has gained extensive attention for HMIs detection as it exhibits outstanding features like broad electrochemical window, large surface area, high conductivity, selectivity and stability. The present review focuses on the recent progress in the field of screen-printed electrochemical sensors for HMIs detection using nanomaterials. Different fabrication methods of SPEs and their utilization for real sample analysis of HMIs using various nanomaterials have been extensively discussed. Additionally, advancement made in this field is also discussed taking help of the recent literature.
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3
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Brazaca LC, Imamura AH, Gomes NO, Almeida MB, Scheidt DT, Raymundo-Pereira PA, Oliveira ON, Janegitz BC, Machado SAS, Carrilho E. Electrochemical immunosensors using electrodeposited gold nanostructures for detecting the S proteins from SARS-CoV and SARS-CoV-2. Anal Bioanal Chem 2022; 414:5507-5517. [PMID: 35169906 PMCID: PMC8853172 DOI: 10.1007/s00216-022-03956-1] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 01/29/2022] [Accepted: 02/01/2022] [Indexed: 12/29/2022]
Abstract
This paper reports the development of a low-cost (< US$ 0.03 per device) immunosensor based on gold-modified screen-printed carbon electrodes (SPCEs). As a proof of concept, the immunosensor was tested for a fast and sensitive determination of S proteins from both SARS-CoV and SARS-CoV-2, by a single disposable device. Gold nanoparticles were electrochemically deposited via direct reduction of gold ions on the electrode using amperometry. Capture antibodies from spike (S) protein were covalently immobilized on carboxylic groups of self-assembled monolayers (SAM) of mercaptoacetic acid (MAA) attached to the gold nanoparticles. Label-free detection of S proteins from both SARS-CoV and SARS-CoV-2 was performed with electrochemical impedance spectroscopy (EIS). The immunosensor fabricated with 9 s gold deposition had a high performance in terms of selectivity, sensitivity, and low limit of detection (LOD) (3.16 pmol L-1), thus permitting the direct determination of the target proteins in spiked saliva samples. The complete analysis can be carried out within 35 min using a simple one-step assay protocol with small sample volumes (10 µL). With such features, the immunoplatform presented here can be deployed for mass testing in point-of-care settings.
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Affiliation(s)
- Laís Canniatti Brazaca
- Instituto de Química de São Carlos, Universidade de São Paulo, São Carlos, SP, 13566-590, Brazil. .,Instituto Nacional de Ciência e Tecnologia de Bioanalítica-INCTBio, Campinas, SP, 13083-970, Brazil.
| | - Amanda Hikari Imamura
- Instituto de Química de São Carlos, Universidade de São Paulo, São Carlos, SP, 13566-590, Brazil.,Instituto Nacional de Ciência e Tecnologia de Bioanalítica-INCTBio, Campinas, SP, 13083-970, Brazil
| | - Nathalia Oezau Gomes
- Instituto de Química de São Carlos, Universidade de São Paulo, São Carlos, SP, 13566-590, Brazil
| | - Mariana Bortholazzi Almeida
- Instituto de Química de São Carlos, Universidade de São Paulo, São Carlos, SP, 13566-590, Brazil.,Instituto Nacional de Ciência e Tecnologia de Bioanalítica-INCTBio, Campinas, SP, 13083-970, Brazil
| | - Desirée Tamara Scheidt
- Instituto de Química de São Carlos, Universidade de São Paulo, São Carlos, SP, 13566-590, Brazil.,Instituto Nacional de Ciência e Tecnologia de Bioanalítica-INCTBio, Campinas, SP, 13083-970, Brazil
| | | | - Osvaldo N Oliveira
- Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, SP, 13566-590, Brazil
| | - Bruno Campos Janegitz
- Departamento de Ciências da Natureza, Matemática e Educação, Universidade Federal de São Carlos, Araras, SP, 13600-970, Brazil
| | | | - Emanuel Carrilho
- Instituto de Química de São Carlos, Universidade de São Paulo, São Carlos, SP, 13566-590, Brazil. .,Instituto Nacional de Ciência e Tecnologia de Bioanalítica-INCTBio, Campinas, SP, 13083-970, Brazil.
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4
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Kartika AE, Setiyanto H, Manurung RV, Jenie SNA, Saraswaty V. Silver Nanoparticles Coupled with Graphene Nanoplatelets Modified Screen-Printed Carbon Electrodes for Rhodamine B Detection in Food Products. ACS OMEGA 2021; 6:31477-31484. [PMID: 34869974 PMCID: PMC8637599 DOI: 10.1021/acsomega.1c03414] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Accepted: 11/09/2021] [Indexed: 05/05/2023]
Abstract
A rapid, simple, and sensitive voltammetric sensor has been fabricated to determine Rhodamine B (RhB), a textile coloring agent. Silver nanoparticles (AgNPs) were synthesized by the chemical reduction method of silver nitrate and sodium citrate. Graphene nanoplatelets (GPLs) and AgNPs were drop-casted on the surface of a working electrode of a screen-printed carbon electrode (SPCE), forming the SPCE-GPLs/AgNPs samples. Scanning electron microscopy-energy dispersive X-ray and cyclic voltammetry confirmed the altered surface of the SPCE. The square wave voltammetry was used for the electrochemical determination of RhB. The SPCE-GPLs/AgNPs demonstrated electrochemical responses to detect RhB with a linear range of 2-100 μM, and the limit of detection was 1.94 μM. The SPCE-GPLs/AgNPs demonstrated a selective detection of RhB in the presence of common interfering compounds present in the food samples, including sucrose and monosodium glutamate. Furthermore, the sensor presented good reproducibility as well as repeatability in the detection of RhB. When the sensor was used to determine RhB in an actual food sample, similar results were shown as suggested by UV-vis spectroscopy analysis. Hence, the fabricated sensor can be applied for the detection of RhB in food samples.
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Affiliation(s)
- Andi Eka Kartika
- Department
of Chemistry (Analytical Chemistry Research Group), Faculty of Mathematics
and Natural Sciences, Bandung Institute
of Technology, Bandung 40132, Indonesia
| | - Henry Setiyanto
- Department
of Chemistry (Analytical Chemistry Research Group), Faculty of Mathematics
and Natural Sciences, Bandung Institute
of Technology, Bandung 40132, Indonesia
- . Fax: +62-22-2504154. Phone: +62-22-2502103
| | - Robeth Viktoria Manurung
- Research
Center for Electronics & Telecommunication, National Research and Innovation Agency Republic of Indonesia, Bandung 40135, Indonesia
- . Phone: +62 815 871 4667
| | - Siti Nurul Aisyiyah Jenie
- Research
Center for Chemistry, National Research
and Innovation Agency Republic of Indonesia, Tangerang Selatan 15314 Indonesia
| | - Vienna Saraswaty
- Research
Unit for Clean Technology, National Research
and Innovation Agency Republic of Indonesia, Bandung 40135, Indonesia
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5
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Mohamad Nor N, Ramli NH, Poobalan H, Qi Tan K, Abdul Razak K. Recent Advancement in Disposable Electrode Modified with Nanomaterials for Electrochemical Heavy Metal Sensors. Crit Rev Anal Chem 2021; 53:253-288. [PMID: 34565248 DOI: 10.1080/10408347.2021.1950521] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Heavy metal pollution has gained global attention due to its high toxicity and non-biodegradability, even at a low level of exposure. Therefore, the development of a disposable electrode that is sensitive, simple, portable, rapid, and cost-effective as the sensor platform in electrochemical heavy metal detection is vital. Disposable electrodes have been modified with nanomaterials so that excellent electrochemical properties can be obtained. This review highlights the recent progress in the development of numerous types of disposable electrodes modified with nanomaterials for electrochemical heavy metal detection. The disposable electrodes made from carbon-based, glass-based, and paper-based electrodes are reviewed. In particular, the analytical performance, fabrication technique, and integration design of disposable electrodes modified with metal (such as gold, tin and bismuth), carbon (such as carbon nanotube and graphene), and metal oxide (such as iron oxide and zinc oxide) nanomaterials are summarized. In addition, the role of the nanomaterials in improving the electrochemical performance of the modified disposable electrodes is discussed. Finally, the current challenges and future prospect of the disposable electrode modified with nanomaterials are summarized.
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Affiliation(s)
- Noorhashimah Mohamad Nor
- School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, 14300 Nibong Tebal, Pulau Pinang, Malaysia
| | - Nurul Hidayah Ramli
- School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, 14300 Nibong Tebal, Pulau Pinang, Malaysia
| | - Hemalatha Poobalan
- School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, 14300 Nibong Tebal, Pulau Pinang, Malaysia
| | - Kai Qi Tan
- School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, 14300 Nibong Tebal, Pulau Pinang, Malaysia
| | - Khairunisak Abdul Razak
- School of Materials and Mineral Resources Engineering, Universiti Sains Malaysia, 14300 Nibong Tebal, Pulau Pinang, Malaysia.,NanoBiotechnology Research & Innovation (NanoBRI), Institute for Research in Molecular Medicine, Universiti Sains Malaysia, 11800 USM, Pulau Pinang, Malaysia
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6
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Attoye B, Baker MJ, Thomson F, Pou C, Corrigan DK. Optimisation of an Electrochemical DNA Sensor for Measuring KRAS G12D and G13D Point Mutations in Different Tumour Types. BIOSENSORS-BASEL 2021; 11:bios11020042. [PMID: 33562505 PMCID: PMC7914712 DOI: 10.3390/bios11020042] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/19/2020] [Revised: 01/29/2021] [Accepted: 02/01/2021] [Indexed: 02/06/2023]
Abstract
Circulating tumour DNA (ctDNA) is widely used in liquid biopsies due to having a presence in the blood that is typically in proportion to the stage of the cancer and because it may present a quick and practical method of capturing tumour heterogeneity. This paper outlines a simple electrochemical technique adapted towards point-of-care cancer detection and treatment monitoring from biofluids using a label-free detection strategy. The mutations used for analysis were the KRAS G12D and G13D mutations, which are both important in the initiation, progression and drug resistance of many human cancers, leading to a high mortality rate. A low-cost DNA sensor was developed to specifically investigate these common circulating tumour markers. Initially, we report on some developments made in carbon surface pre-treatment and the electrochemical detection scheme which ensure the most sensitive measurement technique is employed. Following pre-treatment of the sensor to ensure homogeneity, DNA probes developed specifically for detection of the KRAS G12D and G13D mutations were immobilized onto low-cost screen printed carbon electrodes using diazonium chemistry and 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride/N-hydroxysuccinimide coupling. Prior to electrochemical detection, the sensor was functionalised with target DNA amplified by standard and specialist PCR methodologies (6.3% increase). Assay development steps and DNA detection experiments were performed using standard voltammetry techniques. Sensitivity (as low as 0.58 ng/μL) and specificity (>300%) was achieved by detecting mutant KRAS G13D PCR amplicons against a background of wild-type KRAS DNA from the representative cancer sample and our findings give rise to the basis of a simple and very low-cost system for measuring ctDNA biomarkers in patient samples. The current time to receive results from the system was 3.5 h with appreciable scope for optimisation, thus far comparing favourably to the UK National Health Service biopsy service where patients can wait for weeks for biopsy results.
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Affiliation(s)
- Bukola Attoye
- Department of Biomedical Engineering, University of Strathclyde, 40 George Street, Glasgow G1 1QE, UK;
- Correspondence:
| | - Matthew J. Baker
- Technology and Innovation Centre, Department of Pure and Applied Chemistry, University of Strathclyde, 99 George Street, Glasgow G1 1RD, UK;
| | - Fiona Thomson
- Wolfson Wohl Cancer Research Centre, Institute of Cancer Sciences, University of Glasgow, Glasgow G61 1QH, UK; (F.T.); (C.P.)
| | - Chantevy Pou
- Wolfson Wohl Cancer Research Centre, Institute of Cancer Sciences, University of Glasgow, Glasgow G61 1QH, UK; (F.T.); (C.P.)
| | - Damion K. Corrigan
- Department of Biomedical Engineering, University of Strathclyde, 40 George Street, Glasgow G1 1QE, UK;
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7
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Chakraborty B, Das A, Mandal N, Samanta N, Das N, Chaudhuri CR. Label free, electric field mediated ultrasensitive electrochemical point-of-care device for CEA detection. Sci Rep 2021; 11:2962. [PMID: 33536505 PMCID: PMC7859218 DOI: 10.1038/s41598-021-82580-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Accepted: 01/20/2021] [Indexed: 01/09/2023] Open
Abstract
Developing point-of-care (PoC) diagnostic platforms for carcinoembryonic antigen detection is essential. However, thefew implementations of transferring the signal amplification strategies in electrochemical sensing on paper-based platforms are not satisfactory in terms of detection limit (LOD). In the quest for pushing down LOD, majority of the research has been targeted towards development of improved nanostructured substrates for entrapping more analyte molecules and augmenting the electron transfer rate to the working electrode. But, such approaches have reached saturation. This paper focuses on enhancing the mass transport of the analyte towards the sensor surface through the application of an electric field, in graphene-ZnO nanorods heterostructure. These hybrid nanostructures have been deposited on flexible polyethylene terephthalate substrates with screen printed electrodes for PoC application. The ZnO nanorods have been functionalized with aptamers and the working sensor has been integrated with smartphone interfaced indigenously developed low cost potentiostat. The performance of the system, requiring only 50 µl analyte has been evaluated using electrochemical impedance spectroscopy and validated against commercially available ELISA kit. Limit of detection of 1 fg/ml in human serum with 6.5% coefficient of variation has been demonstrated, which is more than three orders of magnitude lower than the existing attempts on PoC device.
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Affiliation(s)
- B Chakraborty
- Department of Electronics and Telecommunication Engineering, Indian Institute of Engineering Science and Technology, Shibpur, West Bengal, 711103, India
| | - A Das
- Department of Electronics and Telecommunication Engineering, Indian Institute of Engineering Science and Technology, Shibpur, West Bengal, 711103, India
| | - N Mandal
- School of Electrical Sciences, Indian Institute of Technology Goa, Ponda, 403401, Goa, India
| | - N Samanta
- Department of Electronics and Communication Engineering, Techno India University, Sector V, Kolkata, 700091, West Bengal, India
| | - N Das
- Department of Electronics and Communication Engineering, KL University, Green Fields, Vaddeswaram, Andhra Pradesh, 522502, India
| | - C Roy Chaudhuri
- Department of Electronics and Telecommunication Engineering, Indian Institute of Engineering Science and Technology, Shibpur, West Bengal, 711103, India.
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8
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An efficient label-free immunosensor based on ce-MoS2/AgNR composites and screen-printed electrodes for PSA detection. J Solid State Electrochem 2020. [DOI: 10.1007/s10008-020-04872-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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9
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Screen-Printed Electrodes (SPE) for In Vitro Diagnostic Purpose. Diagnostics (Basel) 2020; 10:diagnostics10080517. [PMID: 32722552 PMCID: PMC7460409 DOI: 10.3390/diagnostics10080517] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Revised: 06/11/2020] [Accepted: 07/21/2020] [Indexed: 02/07/2023] Open
Abstract
Due to rapidly spreading infectious diseases and the high incidence of other diseases such as cancer or metabolic syndrome, there is a continuous need for the development of rapid and accurate diagnosis methods. Screen-printed electrodes-based biosensors have been reported to offer reliable results, with high sensitivity and selectivity and, in some cases, low detection limits. There are a series of materials (carbon, gold, platinum, etc.) used for the manufacturing of working electrodes. Each version comes with advantages, as well as challenges for their functionalization. Thus, the aim is to review the most promising biosensors developed using screen-printed electrodes for the detection/quantification of proteins, biomarkers, or pathogenic microorganisms.
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10
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Lakshmanakumar M, Sethuraman S, Rajan KS, Krishnan UM, Rayappan JBB. Activation of edge plane pyrolytic graphite in screen printed carbon electrodes on OHP sheet, Whatman paper and textile substrates. J APPL ELECTROCHEM 2020. [DOI: 10.1007/s10800-020-01413-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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11
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Hannah S, Addington E, Alcorn D, Shu W, Hoskisson PA, Corrigan DK. Rapid antibiotic susceptibility testing using low-cost, commercially available screen-printed electrodes. Biosens Bioelectron 2019; 145:111696. [PMID: 31542679 DOI: 10.1016/j.bios.2019.111696] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Revised: 08/20/2019] [Accepted: 09/09/2019] [Indexed: 10/26/2022]
Abstract
Antimicrobial resistance (AMR) is an issue of upmost global importance, with an annually increasing mortality rate and growing economic burden. Poor antimicrobial stewardship has resulted in an abundance and diverse range of antimicrobial resistance mechanisms. To tackle AMR effectively, better diagnostic tests must be developed in order to improve antibiotic stewardship and reduce the emergence of antibiotic resistant organisms. This study employs a low-cost, commercially available screen printed electrode modified with an agarose-based hydrogel deposit to monitor bacterial growth using the techniques of electrochemical impedance spectroscopy (EIS) and differential pulse voltammetry (DPV) giving rise to a new approach to measuring susceptibility. Susceptible and drug resistant Staphylococcus aureus strains were deposited onto agarose gel modified electrodes which contained clinically important antibiotics to establish growth profiles for each bacterial strain and monitor the influence of the antibiotic on bacterial growth. The results show that S. aureus is able to grow on electrodes modified with gel containing no antibiotic, but is inhibited when the gel modified electrode is seeded with antibiotic. Conversely, methicillin-resistant S. aureus (MRSA; the drug resistant strain) is able to grow on gel modified electrodes containing clinically relevant concentrations of antibiotic. Results show rapid growth profiles, with possible time to results for antibiotic susceptibility <45 min, a significant improvement on the current gold standards of at least 1-2 days.
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Affiliation(s)
- Stuart Hannah
- Department of Biomedical Engineering, University of Strathclyde, 40 George Street, Glasgow, G1 1QE, United Kingdom.
| | - Emily Addington
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, 161 Cathedral Street, Glasgow, G4 0RE, United Kingdom.
| | - David Alcorn
- Division of Anaesthesia, Royal Alexandra Hospital, Corsebar Road, Paisley, PA2 9PN, United Kingdom.
| | - Wenmiao Shu
- Department of Biomedical Engineering, University of Strathclyde, 40 George Street, Glasgow, G1 1QE, United Kingdom.
| | - Paul A Hoskisson
- Strathclyde Institute of Pharmacy and Biomedical Sciences, University of Strathclyde, 161 Cathedral Street, Glasgow, G4 0RE, United Kingdom.
| | - Damion K Corrigan
- Department of Biomedical Engineering, University of Strathclyde, 40 George Street, Glasgow, G1 1QE, United Kingdom.
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12
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Dias AA, Chagas CLS, Silva-Neto HDA, Lobo-Junior EO, Sgobbi LF, de Araujo WR, Paixão TRLC, Coltro WKT. Environmentally Friendly Manufacturing of Flexible Graphite Electrodes for a Wearable Device Monitoring Zinc in Sweat. ACS APPLIED MATERIALS & INTERFACES 2019; 11:39484-39492. [PMID: 31524381 DOI: 10.1021/acsami.9b12797] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Electrochemical sensors based on graphite and polymers have emerged as powerful analytical tools for bioanalytical applications. However, most of the fabrication processes are not environmentally friendly because they often involve the use of toxic reagents and generate waste. This study describes an alternative method to produce flexible electrodes in plastic substrates using graphite powder and thermal laminating sheets by solid-solid deposition through hot compression, without the use of hazardous chemical reagents. The electrodes developed through the proposed approach have successfully demonstrated flexibility, robustness, reproducibility (relative standard deviation around 6%), and versatility. The electrodes were thoroughly characterized by cyclic voltammetry, electrochemical impedance spectroscopy, Raman spectroscopy, and scanning electron microscopy. As a proof of concept, the electrode surfaces were modified with bismuth and used for zinc analysis in sweat. The modified electrodes presented linearity (R2 = 0.996) for a wide zinc concentration range (50-2000 ppb) and low detection limit (4.31 ppb). The proposed electrodes were tested using real sweat samples and the achieved zinc concentrations did not differ statistically from the data obtained by atomic absorption spectroscopy. To allow wearable applications, a 3D-printed device was fabricated, integrated with the proposed electrochemical system, and fixed at the abdomen by using an elastic tape to collect, store, and analyze the sweat sample. The matrix effect test was performed, spiking the real sample with different zinc levels, and the recovery values varied between 85 and 106%, thus demonstrating adequate accuracy and robustness of the flexible electrodes developed based on the proposed fabrication method.
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Affiliation(s)
- Anderson A Dias
- Instituto de Química , Universidade Federal de Goiás , Goiânia , Goiás 74690-900 , Brazil
| | - Cyro L S Chagas
- Departamento de Química Fundamental, Instituto de Química , Universidade de São Paulo , São Paulo , São Paulo 05508-000 , Brazil
| | | | - Eulício O Lobo-Junior
- Instituto de Química , Universidade Federal de Goiás , Goiânia , Goiás 74690-900 , Brazil
| | - Lívia F Sgobbi
- Instituto de Química , Universidade Federal de Goiás , Goiânia , Goiás 74690-900 , Brazil
| | - William R de Araujo
- Departamento de Química Analítica, Instituto de Química , Universidade Estadual de Campinas , Campinas , São Paulo 13083-970 , Brazil
| | - Thiago R L C Paixão
- Departamento de Química Fundamental, Instituto de Química , Universidade de São Paulo , São Paulo , São Paulo 05508-000 , Brazil
- Instituto Nacional de Ciência e Tecnologia de Bioanalítica , Campinas , São Paulo 13084-971 , Brazil
| | - Wendell K T Coltro
- Instituto de Química , Universidade Federal de Goiás , Goiânia , Goiás 74690-900 , Brazil
- Instituto Nacional de Ciência e Tecnologia de Bioanalítica , Campinas , São Paulo 13084-971 , Brazil
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13
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Tyrosinase/Chitosan/Reduced Graphene Oxide Modified Screen-Printed Carbon Electrode for Sensitive and Interference-Free Detection of Dopamine. APPLIED SCIENCES-BASEL 2019. [DOI: 10.3390/app9040622] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Tyrosinase, chitosan, and reduced graphene oxide (rGO) are sequentially used to modify a screen-printed carbon electrode (SPCE) for the detection of dopamine (DA), without interference from uric acid (UA) or ascorbic acid (AA). The use of tyrosinase significantly improves the detection’s specificity. Cyclic voltammetry (CV) measurements demonstrate the high sensitivity and selectivity of the proposed electrochemical sensors, with detection limits of 22 nM and broad linear ranges of 0.4–8 μM and 40–500 μM. The fabricated tyrosinase/chitosan/rGO/SPCE electrodes achieve satisfactory results when applied to human urine samples, thereby demonstrating their feasibility for analyzing DA in physiological samples.
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14
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Xu M, Obodo D, Yadavalli VK. The design, fabrication, and applications of flexible biosensing devices. Biosens Bioelectron 2019; 124-125:96-114. [PMID: 30343162 PMCID: PMC6310145 DOI: 10.1016/j.bios.2018.10.019] [Citation(s) in RCA: 63] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2018] [Revised: 09/29/2018] [Accepted: 10/09/2018] [Indexed: 12/13/2022]
Abstract
Flexible biosensors form part of a rapidly growing research field that take advantage of a multidisciplinary approach involving materials, fabrication and design strategies to be able to function at biological interfaces that may be soft, intrinsically curvy, irregular, or elastic. Numerous exciting advancements are being proposed and developed each year towards applications in healthcare, fundamental biomedical research, food safety and environmental monitoring. In order to place these developments in perspective, this review is intended to present an overview on field of flexible biosensor development. We endeavor to show how this subset of the broader field of flexible and wearable devices presents unique characteristics inherent in their design. Initially, a discussion on the structure of flexible biosensors is presented to address the critical issues specific to their design. We then summarize the different materials as substrates that can resist mechanical deformation while retaining their function of the bioreceptors and active elements. Several examples of flexible biosensors are presented based on the different environments in which they may be deployed or on the basis of targeted biological analytes. Challenges and future perspectives pertinent to the current and future stages of development are presented. Through these summaries and discussion, this review is expected to provide insights towards a systematic and fundamental understanding for the fabrication and utilization of flexible biosensors, as well as inspire and improve designs for smart and effective devices in the future.
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Affiliation(s)
- Meng Xu
- Department of Chemical and Life Science Engineering, Virginia Commonwealth University, 601 W Main Street, Richmond, VA 23284, USA
| | - Dora Obodo
- Department of Chemical and Life Science Engineering, Virginia Commonwealth University, 601 W Main Street, Richmond, VA 23284, USA
| | - Vamsi K Yadavalli
- Department of Chemical and Life Science Engineering, Virginia Commonwealth University, 601 W Main Street, Richmond, VA 23284, USA.
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