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Huang L, Zhang C, Ye R, Yan B, Zhou X, Xu W, Guo J. Capacitive biosensors for label-free and ultrasensitive detection of biomarkers. Talanta 2024; 266:124951. [PMID: 37487266 DOI: 10.1016/j.talanta.2023.124951] [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: 05/04/2023] [Revised: 07/10/2023] [Accepted: 07/14/2023] [Indexed: 07/26/2023]
Abstract
Capacitive biosensors are label-free capacitors that can detect biomarkers with the outstanding advantages of simplicity, low cost, and ultrahigh sensitivity. A typical capacitive biosensor consists of a bioreceptor and a transducer, where the bioreceptor captures the biomarker to form a bioreceptor/biomarker conjugate and the transducer generates a detectable signal. In general, antibodies, aptamers, or proteins are exploited as the bioreceptor, while various electrodes including carbon electrodes (CEs), gold electrodes (AuEs), or interdigitated electrodes (IDEs) may serve as the transducer. Because the formation of bioreceptor/biomarker conjugates often leads to a change in capacitance, the capacitive signal is then employed for biomarker detection. This review summarizes recent advances in capacitive biosensors for the detection of biomarkers over the last five years. With a focus on the three common types of bioreceptors, i.e., antibodies, aptamers, and proteins, capacitive biosensors using CEs, AuEs, and IDEs as the transducers are discussed in detail. The immobilization of bioreceptors and signal amplification strategies are described to provide a robust overview of capacitive biosensors for biomarker detection. In addition, analytical methods and future prospects are given to support the application of capacitive biosensors.
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Affiliation(s)
- Lei Huang
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, China; School of Resources and Environment, University of Electronic Science and Technology of China, Chengdu, China
| | - Cheng Zhang
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, China
| | - Run Ye
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, China
| | - Bin Yan
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, China.
| | - Xiaojia Zhou
- Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China, Huzhou, China.
| | - Wenbo Xu
- School of Resources and Environment, University of Electronic Science and Technology of China, Chengdu, China
| | - Jinhong Guo
- School of Sensing Science and Engineering, Shanghai Jiao Tong University, Shanghai, China.
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Hoang Minh N, Yoon JS, Kang DH, Yoo YE, Kim K. Assembling Vertical Nanogap Arrays with Nanoentities for Highly Sensitive Electrical Biosensing. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:2274-2280. [PMID: 36717271 DOI: 10.1021/acs.langmuir.2c02879] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Nanogap biosensors have emerged as promising platforms for detecting and measuring biochemical substances at low concentrations. Although the nanogap biosensors provide high sensitivity, low limit of detection (LOD), and enhanced signal strength, it requires arduous fabrication processes and costly equipment to obtain micro/nanoelectrodes with extremely narrow gaps in a controlled manner. In this work, we report the novel design and fabrication processes of vertical nanogap structures that can electrically detect and quantify low-concentration biochemical substances. Approximately 40 nm gaps are facilely created by magnetically assembling antibody-coated nanowires onto a nanodisk patterned between a pair of microelectrodes. Analyte molecules tagged with conductive nanoparticles are captured and bound to nanowires and bridge over the nanogaps, which consequently causes an abrupt change in the electrical conductivity between the microelectrodes. Using biotin and streptavidin as model antibodies and analytes, we demonstrated that our nanogap biosensors can effectively measure the protein analytes with the LOD of ∼18 pM. The outcome of this research could inspire the design and fabrication of nanogap devices and nanobiosensors, and it would have a broad impact on the development of microfluidics, biochips, and lab-on-a-chip architectures.
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Affiliation(s)
- Nguyen Hoang Minh
- Department of Nano Manufacturing Technology, Korea Institute of Machinery and Materials (KIMM), Daejeon 34103, Republic of Korea
- Department of Nanomechatronics, University of Science and Technology, Daejeon 34113, Republic of Korea
| | - Jae Sung Yoon
- Department of Nano Manufacturing Technology, Korea Institute of Machinery and Materials (KIMM), Daejeon 34103, Republic of Korea
- Department of Nanomechatronics, University of Science and Technology, Daejeon 34113, Republic of Korea
| | - Do Hyun Kang
- Department of Nano Manufacturing Technology, Korea Institute of Machinery and Materials (KIMM), Daejeon 34103, Republic of Korea
| | - Yeong-Eun Yoo
- Department of Nano Manufacturing Technology, Korea Institute of Machinery and Materials (KIMM), Daejeon 34103, Republic of Korea
- Department of Nanomechatronics, University of Science and Technology, Daejeon 34113, Republic of Korea
| | - Kwanoh Kim
- Department of Nano Manufacturing Technology, Korea Institute of Machinery and Materials (KIMM), Daejeon 34103, Republic of Korea
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Capacitive biosensor based on vertically paired electrodes for the detection of SARS-CoV-2. Biosens Bioelectron 2022; 202:113975. [PMID: 35042131 PMCID: PMC8741629 DOI: 10.1016/j.bios.2022.113975] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Revised: 12/31/2021] [Accepted: 01/06/2022] [Indexed: 12/21/2022]
Abstract
Vertically paired electrodes (VPEs) with multiple electrode pairs were developed for the enhancement of capacitive measurements by optimizing the electrode gap and number of electrode pairs. The electrode was fabricated using a conductive polymer layer of PEDOT:PSS instead of Ag and Pt metal electrodes to increase the VPE fabrication yield because the PEDOT:PSS layer could be effectively etched using a reactive dry etching process. In this study, sensitivity enhancement was realized by decreasing the electrode gap and increasing the number of VPE electrode pairs. Such an increase in sensitivity according to the electrode gap and the number of electrode pairs was estimated using a model analyte for an immunoassay. Additionally, a computer simulation was performed using VPEs with different electrode gaps and numbers of VPE electrode pairs. Finally, VPEs with multiple electrode pairs were applied for SARS-CoV-2 nucleoprotein (NP) detection. The capacitive biosensor based on the VPE with immobilized anti-SARS-CoV-2 NP was applied for the specific detection of SARS-CoV-2 in viral cultures. Using viral cultures of SARS-CoV-2, SARS-CoV, MERS-CoV, and CoV-strain 229E, the limit of detection (LOD) was estimated to satisfy the cutoff value (dilution factor of 1/800) for the medical diagnosis of COVID-19, and the assay results from the capacitive biosensor were compared with commercial rapid kit based on a lateral flow immunoassay.
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Abdallah M. Design, Simulation, and Development of a BioSensor for Viruses Detection Using FPGA. IEEE JOURNAL OF TRANSLATIONAL ENGINEERING IN HEALTH AND MEDICINE-JTEHM 2021; 9:1700106. [PMID: 33598367 PMCID: PMC7880301 DOI: 10.1109/jtehm.2021.3055984] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/15/2020] [Revised: 01/07/2021] [Accepted: 01/14/2021] [Indexed: 12/03/2022]
Abstract
Objective: Impedance based biosensing provides a unique, highly sensitive electrical approach to biomolecule detection, cell growth, and other biological events. To date, an impedance change due to the cell growth has been considered as a solution to detect some changes in a cell’s behavior. The impedance change detection is normally measured via an impedance analyzer which is expensive and also cumbersome. Rapid and definitive diagnosis of viral infections is imperative in patient treatment process. Early detection followed by appropriate lifestyle and treatment may result to a longer, healthier life. Certain patients require continues monitoring that may require regular visits to hospitals which is not practical. Therefore, a continuous home healthcare device is needed to monitor and detect any change in a patient’s health condition. Methods & Results: In this research, a novel sensor and healthcare monitoring system is modeled, simulated, developed, and tested to detect viruses by detecting the change in the impedance due to antibodies and antigens binding. First, COMSOL simulation tool is used to develop a model to prove the concept. The model predicts increasing impedance during functionalization of electrodes with antibodies and after antigen binding steps. Second, to understand how nanoscale electrode size and spacing would affect biosensing assay (antibody-based affinity binding of a protein antigen), a model using COMSOL is developed. Third, Field Programmable Gate Arrays (FPGA) based signal processing system is developed as well to be connected to analog to digital converter (ADC) to acquire the current and voltage readings of the sensors over time. This healthcare monitoring system is used to continuously monitoring a patient’s condition and reports any changes in the impedance readings which represents virus detection or at least change in the cell’s behavior. Conclusions: The proposed sensor model is simulated, tested and verified via COMSOL and the FPGA prototype is tested and it verified the COMSOL model. This work reports that the proposed sensor can be used to detect viruses via detecting a change in the impedance.
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Affiliation(s)
- M Abdallah
- SUNY Polytechnic InstituteUticaNY13504USA
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Ngoc Le HT, Park J, Chinnadayyala SR, Cho S. Sensitive electrochemical detection of amyloid beta peptide in human serum using an interdigitated chain-shaped electrode. Biosens Bioelectron 2019; 144:111694. [DOI: 10.1016/j.bios.2019.111694] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Revised: 09/05/2019] [Accepted: 09/06/2019] [Indexed: 01/13/2023]
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Terse-Thakoor T, Ramnani P, Villarreal C, Yan D, Tran TT, Pham T, Mulchandani A. Graphene nanogap electrodes in electrical biosensing. Biosens Bioelectron 2018; 126:838-844. [PMID: 30602266 DOI: 10.1016/j.bios.2018.11.049] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Revised: 11/20/2018] [Accepted: 11/21/2018] [Indexed: 11/16/2022]
Abstract
Graphene nanogap electrodes are reported here for the first time in an electrical biosensor for the detection of biomolecular interactions. Streptavidin-biotin was chosen as a model system for evaluating the sensor's performance. High-affinity interactions of streptavidin-gold nanoparticles (strep-AuNPs) to the biotin-functionalized nanogap localizes AuNPs, thereby bridging the gap and resulting in changes in device conductance. Biosensing performance was optimized by varying the gap size, AuNP diameter, and streptavidin coverage on AuNPs. The sensitivity and limit of detection (LOD) of streptavidin detection with the optimized parameters were determined to be 0.3 µA/nM and 0.25 pM, respectively. The proposed platform suggests high potential as a portable point-of-use biosensor for the detection of other affinity-based biomolecular interactions, such as antigen-antibody, nucleic acid, or chemo-selective interactions.
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Affiliation(s)
- Trupti Terse-Thakoor
- Department of Bioengineering, University of California, Riverside, CA 92521, United States.
| | - Pankaj Ramnani
- Department of Chemical and Environmental Engineering, University of California, Riverside, CA 92521, United States
| | - Claudia Villarreal
- Materials Science and Engineering Program, University of California, Riverside, CA 92521, United States
| | - Dong Yan
- Center for Nanoscale Science and Engineering (CNSE), University of California, Riverside, CA 92521, United States
| | - Thien-Toan Tran
- Department of Bioengineering, University of California, Riverside, CA 92521, United States; Department of Chemical and Environmental Engineering, University of California, Riverside, CA 92521, United States
| | - Tung Pham
- Department of Chemical and Environmental Engineering, University of California, Riverside, CA 92521, United States
| | - Ashok Mulchandani
- Department of Chemical and Environmental Engineering, University of California, Riverside, CA 92521, United States; Materials Science and Engineering Program, University of California, Riverside, CA 92521, United States.
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Hermansen P, MacKay S, Wishart D. Simulations and design of microfabricated interdigitated electrodes for use in a gold nanoparticle enhanced biosensor. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2017; 2016:299-302. [PMID: 28268336 DOI: 10.1109/embc.2016.7590699] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Microfabricated interdigitated electrode chips have been designed for use in a unique gold-nanoparticle based biosensor system. The use of these electrodes will allow for simple, accurate, inexpensive, and portable biosensing, with potential applications in diagnostics, medical research, and environmental testing. To determine the optimal design for these electrodes, finite element analysis simulations were carried out using COMSOL Multiphysics software. The results of these simulations determined some of the optimal design parameters for microfabricating interdigitated electrodes as well as predicting the effects of different electrode materials. Finally, based on the results of these simulations two different kinds of interdigitated electrode chips were made using photolithography.
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Skotadis E, Voutyras K, Chatzipetrou M, Tsekenis G, Patsiouras L, Madianos L, Chatzandroulis S, Zergioti I, Tsoukalas D. Label-free DNA biosensor based on resistance change of platinum nanoparticles assemblies. Biosens Bioelectron 2016; 81:388-394. [DOI: 10.1016/j.bios.2016.03.028] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2015] [Revised: 02/24/2016] [Accepted: 03/14/2016] [Indexed: 11/24/2022]
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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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Yagati AK, Park J, Cho S. Reduced Graphene Oxide Modified the Interdigitated Chain Electrode for an Insulin Sensor. SENSORS (BASEL, SWITZERLAND) 2016; 16:E109. [PMID: 26784202 PMCID: PMC4732142 DOI: 10.3390/s16010109] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/28/2015] [Revised: 01/12/2016] [Accepted: 01/13/2016] [Indexed: 02/02/2023]
Abstract
Insulin is a key regulator in glucose homeostasis and its deficiency or alternations in the human body causes various types of diabetic disorders. In this paper, we present the development of a reduced graphene oxide (rGO) modified interdigitated chain electrode (ICE) for direct capacitive detection of insulin. The impedance properties of rGO-ICE were characterized by equivalent circuit modeling. After an electrochemical deposition of rGO on ICE, the electrode was modified with self-assembled monolayers and insulin antibodies in order to achieve insulin binding reactions. The impedance spectra and capacitances were measured with respect to the concentrations of insulin and the capacitance change (ΔC) was analyzed to quantify insulin concentration. The antibody immobilized electrode showed an increment of ΔC according to the insulin concentration in human serum ranging from 1 ng/mL to 10 µg/mL. The proposed sensor is feasible for label-free and real-time measuring of the biomarker and for point-of-care diagnosis.
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Affiliation(s)
- Ajay Kumar Yagati
- Department of Biomedical Engineering, Gachon University, 191 Hambakmoe-ro, Yeonsu-gu, Incheon 21936, Korea.
- Gachon Advanced Institute for Health Science & Technology, Gachon University, 155 Get-Pearl-ro, Yeonsu-gu, Incheon 21999, Korea.
| | - Jinsoo Park
- Gachon Advanced Institute for Health Science & Technology, Gachon University, 155 Get-Pearl-ro, Yeonsu-gu, Incheon 21999, Korea.
| | - Sungbo Cho
- Department of Biomedical Engineering, Gachon University, 191 Hambakmoe-ro, Yeonsu-gu, Incheon 21936, Korea.
- Gachon Advanced Institute for Health Science & Technology, Gachon University, 155 Get-Pearl-ro, Yeonsu-gu, Incheon 21999, Korea.
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MacKay S, Hermansen P, Wishart D, Chen J. Simulations of Interdigitated Electrode Interactions with Gold Nanoparticles for Impedance-Based Biosensing Applications. SENSORS 2015; 15:22192-208. [PMID: 26364638 PMCID: PMC4610437 DOI: 10.3390/s150922192] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/15/2015] [Revised: 08/13/2015] [Accepted: 08/21/2015] [Indexed: 11/30/2022]
Abstract
In this paper, we describe a point-of-care biosensor design. The uniqueness of our design is in its capability for detecting a wide variety of target biomolecules and the simplicity of nanoparticle enhanced electrical detection. The electrical properties of interdigitated electrodes (IDEs) and the mechanism for gold nanoparticle-enhanced impedance-based biosensor systems based on these electrodes are simulated using COMSOL Multiphysics software. Understanding these properties and how they can be affected is vital in designing effective biosensor devices. Simulations were used to show electrical screening develop over time for IDEs in a salt solution, as well as the electric field between individual digits of electrodes. Using these simulations, it was observed that gold nanoparticles bound closely to IDEs can lower the electric field magnitude between the digits of the electrode. The simulations are also shown to be a useful design tool in optimizing sensor function. Various different conditions, such as electrode dimensions and background ion concentrations, are shown to have a significant impact on the simulations.
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Affiliation(s)
- Scott MacKay
- Electrical and Computer Engineering Department, University of Alberta, 116 St & 85 Ave, Edmonton, AB T6G 2R3, Canada.
| | - Peter Hermansen
- Electrical and Computer Engineering Department, University of Alberta, 116 St & 85 Ave, Edmonton, AB T6G 2R3, Canada.
| | - David Wishart
- Department of Computing Science, 2-21 Athabasca Hall, University of Alberta, Edmonton, AB T6G 2E8, Canada.
| | - Jie Chen
- Electrical and Computer Engineering Department, University of Alberta, 116 St & 85 Ave, Edmonton, AB T6G 2R3, Canada.
- National Research Council/National Institute for Nanotechnology, 11421 Saskatchewan Dr NW, Edmonton, AB T6G 2M9, Canada.
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12
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Jang HJ, Ahn J, Kim MG, Shin YB, Jeun M, Cho WJ, Lee KH. Electrical signaling of enzyme-linked immunosorbent assays with an ion-sensitive field-effect transistor. Biosens Bioelectron 2014; 64:318-23. [PMID: 25240958 DOI: 10.1016/j.bios.2014.09.020] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2014] [Revised: 09/02/2014] [Accepted: 09/06/2014] [Indexed: 01/27/2023]
Abstract
Optical laboratory-based immunoassays, such as enzyme-linked immunosorbent assay (ELISA) give a high sensitivity and specificity of various fatal diseases. However, these assays are no longer efficient in on-spot diagnostics of wide-spreading and contagious infections. At this point in time, portable and handhold devices play a pivotal role in infectious diseases with quick diagnostics at or near the site of the disease propagation. In this paper, we demonstrated a novel electrical immunoassay of ELISA that was not based on optical signaling but on electrical signaling. This was done by combining an ion-sensitive field-effect transistor (ISFET) with ELISA. By harnessing the catalytic reaction of alkaline phosphatase that precipitated silver particles, we effectively overcame the chronic Debye screening length issue of the ISFET. Ultimately, small signal ranging from 1 pg/mL to 10 ng/mL was immensely amplified with the ALP label, regardless of buffer conditions. The sensor platform herein surpassed a sensing capability of conventional ELISA that is considered to have a LOD on the order of ~1 ng/mL. The results were compared with those of horseradish peroxidase label, which is generally used for optical analyses in ELISA. Our newly developed ISFET-based portable sensor holds a large potential for point-of-care tools in a variety of diseases, without being limited by the need for expensive equipment such as spectrophotometers.
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Affiliation(s)
- Hyun-June Jang
- Biomedical Research Institute, Korea Institute of Science and Technology (KIST), 5 Hwarangno 14-gil, Seongbuk-gu, Seoul 136-791, Korea; AMC-KIST Translational Research Center (TRC), Asan Medical Center, 88 Olympic-ro 43-gil, Songpa-gu, Seoul 138-736, Korea
| | - Junhyoung Ahn
- Department of Nano Manufacturing Technology, Nano Convergence Mechanical Systems Research Division, Korea Institute of Machinery and Materials, 156 Gajeongbuk-Ro, Yuseong-Gu, Daejeon 305-343, Korea
| | - Min-Gon Kim
- Department of Chemistry, Gwangju Institute of Science & Technology, 123 Chemdangwagi-Ro, Buk-Gu, Gwangju 500-712, Korea
| | - Yong-Beom Shin
- Research Center of Integrative Cellulomics, Korea Research Institute of Bioscience and Biotechnology, 125 Gwahak-Ro, Yuseong-Gu, Daejeon 305-806, Korea
| | - Minhong Jeun
- Biomedical Research Institute, Korea Institute of Science and Technology (KIST), 5 Hwarangno 14-gil, Seongbuk-gu, Seoul 136-791, Korea; AMC-KIST Translational Research Center (TRC), Asan Medical Center, 88 Olympic-ro 43-gil, Songpa-gu, Seoul 138-736, Korea
| | - Won-Ju Cho
- Department of Electronic Materials Engineering, Kwangwoon University, 20 Gwangun-ro, Nowon-gu, Seoul 139-701, Korea.
| | - Kwan Hyi Lee
- Biomedical Research Institute, Korea Institute of Science and Technology (KIST), 5 Hwarangno 14-gil, Seongbuk-gu, Seoul 136-791, Korea; AMC-KIST Translational Research Center (TRC), Asan Medical Center, 88 Olympic-ro 43-gil, Songpa-gu, Seoul 138-736, Korea.
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Jung HW, Chang YW, Lee GY, Cho S, Kang MJ, Pyun JC. A capacitive biosensor based on an interdigitated electrode with nanoislands. Anal Chim Acta 2014; 844:27-34. [PMID: 25172812 DOI: 10.1016/j.aca.2014.07.006] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2014] [Revised: 07/01/2014] [Accepted: 07/08/2014] [Indexed: 01/30/2023]
Abstract
A capacitive biosensor based on an interdigitated electrode (IDE) with nanoislands was developed for label-free detection of antigen-antibody interactions. To enable sensitive capacitive detection of protein adsorption, the nanoislands were fabricated between finger electrodes of the IDE. The effect of the nanoislands on the sensitive capacitive measurement was estimated using horseradish peroxidase (HRP) as a model protein. Additionally, a parylene-A film was coated on the IDE with nanoislands to improve the efficiency of protein immobilization. By using HRP and hepatitis B virus surface antigen (HBsAg) as model analytes, the effect of the parylene-A film on the capacitive detection of protein adsorption was demonstrated.
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Affiliation(s)
- Ha-Wook Jung
- Department of Materials Science and Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749, South Korea
| | - Young Wook Chang
- Department of Materials Science and Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749, South Korea
| | - Ga-yeon Lee
- Department of Materials Science and Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749, South Korea
| | - Sungbo Cho
- Department of Biomedical Engineering, Gachon University, Incheon 406-799, South Korea
| | - Min-Jung Kang
- Korea Institute of Science and Technology (KIST), Seoul, South Korea
| | - Jae-Chul Pyun
- Department of Materials Science and Engineering, Yonsei University, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-749, South Korea.
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Lee GY, Choi YH, Chung HW, Ko H, Cho S, Pyun JC. Capacitive immunoaffinity biosensor based on vertically paired ring-electrodes. Biosens Bioelectron 2013; 40:227-32. [DOI: 10.1016/j.bios.2012.07.028] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2012] [Revised: 07/12/2012] [Accepted: 07/18/2012] [Indexed: 11/16/2022]
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