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Betti C, Busi I, Cortesi C, Anselmi L, Mendoza-Sagaon M, Simonetti GD. Fluids and body composition during anesthesia in children and adolescents: A pilot study. Eur J Pediatr 2024; 183:2251-2256. [PMID: 38407589 PMCID: PMC11035464 DOI: 10.1007/s00431-024-05490-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Revised: 02/15/2024] [Accepted: 02/18/2024] [Indexed: 02/27/2024]
Abstract
The purpose of this study is to evaluate the intracellular and extracellular volume before and after anesthesia in order to ascertain their variations and determine the potential utility of this information in optimizing intraoperative fluid administration practices. A bioimpedance spectroscopy device (body composition monitor, BCM) was used to measure total body fluid volume, extracellular volume, and intracellular volume. BCM measurements were performed before and after general anesthesia in unselected healthy children and adolescents visiting the Pediatric Institute of Southern Switzerland for low-risk surgical procedures hydrated with an isotonic solution. In 100 children and adolescents aged 7.0 (4.8-11) years (median and interquartile range), the average total body water increased perioperatively with a delta value of 182 (0-383) mL/m2 from pre- to postoperatively, as well as the extracellular water content, which had a similar increase with a delta value of 169 (19-307) mL/m2. The changes in total body water and extracellular water content significantly correlated with the amount of fluids administered. The intracellular water content did not significantly change. Conclusion: Intraoperative administration of isotonic solutions results in a significant fluid accumulation in low-risk schoolchildren during general anesthesia. The results suggest that children without major health problems undergoing short procedures do not need any perioperative intravenous fluid therapy, because they are allowed to take clear fluids up to 1 h prior anesthesia. In future studies, the use of BCM measurements has the potential to be valuable in guiding intraoperative fluid therapy. What is Known: • Most children who undergo common surgical interventions or investigations requiring anesthesia are nowadays hydrated at a rate of 1700 mL/m2/day with an isotonic solution. • The use bioimpedance spectroscopy for the assessment of fluid status in healthy children has already been successfully validated. • The bioimpedance spectroscopy is already currently widely used in various nephrological settings to calculate fluid overload and determine patient's optimal fluid status. What is New: • Routine intraoperative fluid administration results in a significant fluid accumulation during general anesthesia in low-risk surgical procedures. • This observation might be relevant for children and adolescents with conditions predisposing to fluid retention. • In future studies, the use of BCM measurements has the potential to be valuable in guiding intraoperative fluid therapy.
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Affiliation(s)
- Céline Betti
- Pediatric Institute of Southern Switzerland, Ospedale San Giovanni, Ente Ospedaliero Cantonale, Bellinzona, Switzerland
| | - Ilaria Busi
- Pediatric Institute of Southern Switzerland, Ospedale San Giovanni, Ente Ospedaliero Cantonale, Bellinzona, Switzerland
| | - Cinzia Cortesi
- Pediatric Institute of Southern Switzerland, Ospedale San Giovanni, Ente Ospedaliero Cantonale, Bellinzona, Switzerland
| | - Luciano Anselmi
- Pediatric Institute of Southern Switzerland, Ospedale San Giovanni, Ente Ospedaliero Cantonale, Bellinzona, Switzerland
| | - Mario Mendoza-Sagaon
- Pediatric Institute of Southern Switzerland, Ospedale San Giovanni, Ente Ospedaliero Cantonale, Bellinzona, Switzerland
| | - Giacomo D Simonetti
- Pediatric Institute of Southern Switzerland, Ospedale San Giovanni, Ente Ospedaliero Cantonale, Bellinzona, Switzerland.
- Faculty of Biomedical Sciences, Università della Svizzera Italiana, Lugano, Switzerland.
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Dusíková A, Baranová T, Krahulec J, Dakošová O, Híveš J, Naumowicz M, Gál M. Electrochemical Impedance Spectroscopy for the Sensing of the Kinetic Parameters of Engineered Enzymes. Sensors (Basel) 2024; 24:2643. [PMID: 38676260 PMCID: PMC11054234 DOI: 10.3390/s24082643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2024] [Revised: 04/12/2024] [Accepted: 04/16/2024] [Indexed: 04/28/2024]
Abstract
The study presents a promising approach to enzymatic kinetics using Electrochemical Impedance Spectroscopy (EIS) to assess fundamental parameters of modified enteropeptidases. Traditional methods for determining these parameters, while effective, often lack versatility and convenience, especially under varying environmental conditions. The use of EIS provides a novel approach that overcomes these limitations. The enteropeptidase underwent genetic modification through the introduction of single amino acid modifications to assess their effect on enzyme kinetics. However, according to the one-sample t-test results, the difference between the engineered enzymes and hEKL was not statistically significant by conventional criteria. The kinetic parameters were analyzed using fluorescence spectroscopy and EIS, which was found to be an effective tool for the real-time measurement of enzyme kinetics. The results obtained through EIS were not significantly different from those obtained through traditional fluorescence spectroscopy methods (p value >> 0.05). The study validates the use of EIS for measuring enzyme kinetics and provides insight into the effects of specific amino acid changes on enteropeptidase function. These findings have potential applications in biotechnology and biochemical research, suggesting a new method for rapidly assessing enzymatic activity.
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Affiliation(s)
- Adriána Dusíková
- Department of Molecular Biology, Faculty of Natural Sciences, Commenius University, Ilkovičova 6, 842 15 Bratislava, Slovakia; (A.D.); (J.K.)
| | - Timea Baranová
- Department of Inorganic Technology, Faculty of Chemical and Food Technology STU in Bratislava, Radlinského 9, 812 37 Bratislava, Slovakia; (T.B.); (O.D.); (J.H.)
| | - Ján Krahulec
- Department of Molecular Biology, Faculty of Natural Sciences, Commenius University, Ilkovičova 6, 842 15 Bratislava, Slovakia; (A.D.); (J.K.)
| | - Olívia Dakošová
- Department of Inorganic Technology, Faculty of Chemical and Food Technology STU in Bratislava, Radlinského 9, 812 37 Bratislava, Slovakia; (T.B.); (O.D.); (J.H.)
| | - Ján Híveš
- Department of Inorganic Technology, Faculty of Chemical and Food Technology STU in Bratislava, Radlinského 9, 812 37 Bratislava, Slovakia; (T.B.); (O.D.); (J.H.)
| | - Monika Naumowicz
- Faculty of Chemistry, University of Białystok, ul. K. Ciołkowskiego 1K, 15-245 Białystok, Poland;
| | - Miroslav Gál
- Department of Inorganic Technology, Faculty of Chemical and Food Technology STU in Bratislava, Radlinského 9, 812 37 Bratislava, Slovakia; (T.B.); (O.D.); (J.H.)
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Malecka-Baturo K, Żółtowska P, Jackowska A, Kurzątkowska-Adaszyńska K, Grabowska I. Electrochemical Aptasensing Platform for the Detection of Retinol Binding Protein-4. Biosensors (Basel) 2024; 14:101. [PMID: 38392020 PMCID: PMC10887324 DOI: 10.3390/bios14020101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Revised: 02/05/2024] [Accepted: 02/12/2024] [Indexed: 02/24/2024]
Abstract
Here, we present the results of our the electrochemical aptasensing strategy for retinol binding protein-4 (RBP-4) detection based on a thiolated aptamer against RBP-4 and 6-mercaptohexanol (MCH) directly immobilized on a gold electrode surface. The most important parameters affecting the magnitude of the analytical signal generated were optimized: (i) the presence of magnesium ions in the immobilization and measurement buffer, (ii) the concentration of aptamer in the immobilization solution and (iii) its folding procedure. In this work, a systematic assessment of the electrochemical parameters related to the optimization of the sensing layer of the aptasensor was carried out (electron transfer coefficients (α), electron transfer rate constants (k0) and surface coverage of the thiolated aptamer probe (ΓApt)). Then, under the optimized conditions, the analytical response towards RBP-4 protein, in the presence of an Fe(CN)63-/4- redox couple in the supporting solution was assessed. The proposed electrochemical strategy allowed for RBP-4 detection in the concentration range between 100 and 1000 ng/mL with a limit of detection equal to 44 ng/mL based on electrochemical impedance spectroscopy (EIS). The specificity studies against other diabetes biomarkers, including vaspin and adiponectin, proved the selectivity of the proposed platform. These preliminary results will be used in the next step to miniaturize and test the sensor in real samples.
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Affiliation(s)
- Kamila Malecka-Baturo
- Institute of Animal Reproduction and Food Research Polish Academy of Sciences, Tuwima 10, 10-748 Olsztyn, Poland; (K.M.-B.); (K.K.-A.)
| | - Paulina Żółtowska
- Department of Chemistry, University of Warmia and Mazury, Plac Łódzki 4, 10-721 Olsztyn, Poland; (P.Ż.); (A.J.)
| | - Agnieszka Jackowska
- Department of Chemistry, University of Warmia and Mazury, Plac Łódzki 4, 10-721 Olsztyn, Poland; (P.Ż.); (A.J.)
| | - Katarzyna Kurzątkowska-Adaszyńska
- Institute of Animal Reproduction and Food Research Polish Academy of Sciences, Tuwima 10, 10-748 Olsztyn, Poland; (K.M.-B.); (K.K.-A.)
| | - Iwona Grabowska
- Institute of Animal Reproduction and Food Research Polish Academy of Sciences, Tuwima 10, 10-748 Olsztyn, Poland; (K.M.-B.); (K.K.-A.)
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Koelmeyer LA, Gaitatzis K, Thompson B, Ward LC. Effects of Body Positioning When Assessing Lymphedema of the Lower Limb Using Bioimpedance Spectroscopy. Lymphat Res Biol 2024; 22:43-54. [PMID: 37851985 DOI: 10.1089/lrb.2022.0108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2023] Open
Abstract
Background: Bioimpedance spectroscopy (BIS) measurements are conventionally performed in supine position with a lead device attached to gel-backed electrodes, and more recently, with a stand-on device that uses fixed stainless-steel electrodes under the hands and feet. The aim of this study was to assess and compare BIS measurements made in supine, sitting, and standing positions using lead and stand-on impedance devices in participants with and without unilateral leg lymphedema. Materials and Methods: Participants with self-ascribed unilateral leg lymphedema (n = 24) and healthy controls (n = 71) were recruited using a cross-sectional study design. Triplicate BIS measurements were taken for each device in each position. Results: Impedance measurements with either device were reliable with coefficient of variation of 0.6% or lower. The magnitude of mean differences in absolute impedance values between devices were between 1% and 6% dependent on condition. L-Dex scores between the two devices were highly correlated (r = 0.82) and ∼70% of participants in the lymphedema group were classified as having lymphedema using the recommended cut-off with either device. There was no significant interleg difference of controls using the lead device; however, small, but significant differences (p = 0.0001) were found when using the stand-on device. Conclusion: The findings demonstrate that reliable impedance measurements of the legs can be made with either device in lying, sitting, or standing positions. However, data between the devices were not directly interchangeable. Although the risk of misidentification was small, reference ranges appropriate to the device and measurement position should be used when converting data to L-Dex scores.
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Affiliation(s)
- Louise A Koelmeyer
- Australian Lymphoedema Education, Research and Treatment Centre, Department of Health Sciences, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, Australia
| | - Katrina Gaitatzis
- Australian Lymphoedema Education, Research and Treatment Centre, Department of Health Sciences, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, Australia
| | - Belinda Thompson
- Australian Lymphoedema Education, Research and Treatment Centre, Department of Health Sciences, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, Australia
| | - Leigh C Ward
- Australian Lymphoedema Education, Research and Treatment Centre, Department of Health Sciences, Faculty of Medicine and Health Sciences, Macquarie University, Sydney, Australia
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, Brisbane, Australia
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Arman S, Tilley RD, Gooding JJ. A review of electrochemical impedance as a tool for examining cell biology and subcellular mechanisms: merits, limits, and future prospects. Analyst 2024; 149:269-289. [PMID: 38015145 DOI: 10.1039/d3an01423a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2023]
Abstract
Herein the development of cellular impedance biosensors, electrochemical impedance spectroscopy, and the general principles and terms associated with the cell-electrode interface is reviewed. This family of techniques provides quantitative and sensitive information into cell responses to stimuli in real-time with high temporal resolution. The applications of cell-based impedance biosensors as a readout in cell biology is illustrated with a diverse range of examples. The current state of the field, its limitations, the possible available solutions, and the potential benefits of developing biosensors are discussed.
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Affiliation(s)
- Seyedyousef Arman
- School of Chemistry, The University of New South Wales, Sydney, New South Wales 2052, Australia.
- Australia Centre for Nanomedicine, The University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Richard D Tilley
- School of Chemistry, The University of New South Wales, Sydney, New South Wales 2052, Australia.
- Electron Microscope Unit, Mark Wainwright Analytical Centre, The University of New South Wales, Sydney, New South Wales 2052, Australia
| | - J Justin Gooding
- School of Chemistry, The University of New South Wales, Sydney, New South Wales 2052, Australia.
- Australia Centre for Nanomedicine, The University of New South Wales, Sydney, New South Wales 2052, Australia
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6
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Lomont JP, Smith JP. In situ process analytical technology for real time viable cell density and cell viability during live-virus vaccine production. Int J Pharm 2024; 649:123630. [PMID: 38040394 DOI: 10.1016/j.ijpharm.2023.123630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Revised: 11/13/2023] [Accepted: 11/19/2023] [Indexed: 12/03/2023]
Abstract
Viable cell density (VCD) and cell viability (CV) are key performance indicators of cell culture processes in biopharmaceutical production of biologics and vaccines. Traditional methods for monitoring VCD and CV involve offline cell counting assays that are both labor intensive and prone to high variability, resulting in sparse sampling and uncertainty in the obtained data. Process analytical technology (PAT) approaches offer a means to address these challenges. Specifically, in situ probe-based measurements of dielectric spectroscopy (also commonly known as capacitance) can characterize VCD and CV continuously in real time throughout an entire process, enabling robust process characterization. In this work, we propose in situ dielectric spectroscopy as a PAT tool for real time analysis of live-virus vaccine (LVV) production. Dielectric spectroscopy was collected across 25 discreet frequencies, offering a thorough evaluation of the proposed technology. Correlation of this PAT methodology to traditional offline cell counting assays was performed, in which VCD and CV were both successfully predicted using dielectric spectroscopy. Both univariate and multivariate data analysis approaches were evaluated for their potential to establish correlation between the in situ dielectric spectroscopy and offline measurements. Univariate analysis strategies are presented for optimal single frequency selection. Multivariate analysis, in the form of partial least squares (PLS) regression, produced significantly higher correlations between dielectric spectroscopy and offline VCD and CV data, as compared to univariate analysis. Specifically, by leveraging multivariate analysis of dielectric information from all 25 spectroscopic frequencies measured, PLS models performed significantly better than univariate models. This is particularly evident during cell death, where tracking VCD and CV have historically presented the greatest challenge. The results of this work demonstrate the potential of both single and multiple frequency dielectric spectroscopy measurements for enabling robust LVV process characterization, suggesting that broader application of in situ dielectric spectroscopy as a PAT tool in LVV processes can provide significantly improved process understanding. To the best of our knowledge, this is the first report of in situ dielectric spectroscopy with multivariate analysis to successfully predict VCD and CV in real time during live virus-based vaccine production.
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Affiliation(s)
- Justin P Lomont
- Analytical Research & Development, MRL, Merck & Co., Inc., West Point, PA 19486, USA.
| | - Joseph P Smith
- Process Research & Development, MRL, Merck & Co., Inc., West Point, PA 19486, USA.
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Bachour Junior B, Batistuti Sawazaki MR, Mulato M. Electrochemical capacitive dengue aptasensor using NS1 in undiluted human serum. Mikrochim Acta 2024; 191:72. [PMID: 38170245 DOI: 10.1007/s00604-023-06141-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Accepted: 12/05/2023] [Indexed: 01/05/2024]
Abstract
Non-structural 1 (NS1) is a protein biomarker that can be found in blood in the early stages of dengue and related infections (Zika and Chikungunya). This study aims to develop a biosensor to selectively quantify NS1 using DNA aptamer co-immobilized on gold electrodes with 6-(ferrocenyl)hexanethiol (FCH) using electrochemical capacitive spectroscopy. This technique uses a redox probe (FCH) immobilized on the self-assembled monolayer to convert impedance into capacitance information. The developed platform was blocked with bovine serum albumin before NS1 exposure and the ratio between aptamers and FCH was optimized. The aptasensor was tested using commercial NS1 serotype 4 in phosphate-buffered saline and commercial undiluted human serum. Using the optimum applied potential provides high sensitivity (3 and 4 nF per decade) and low limit of detection (30.9 and 41.8 fg/mL) with a large linear range (10 pg to 1 µg/mL and 10 pg to 100 ng/mL, respectively). Both results exhibit a residual standard deviation value < 1%. The results suggested that this aptasensor was capable of detecting NS1 in the clinical range and can be applied to any other specific aptamer with FCH, opening the path for label-free miniaturized point-of-care devices with high sensitivity and specificity.
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Affiliation(s)
- Bassam Bachour Junior
- Department of Physics, Faculty of Philosophy, Science and Letter at Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, 14040-901, Brazil
| | - Marina Ribeiro Batistuti Sawazaki
- Department of Physics, Faculty of Philosophy, Science and Letter at Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, 14040-901, Brazil.
| | - Marcelo Mulato
- Department of Physics, Faculty of Philosophy, Science and Letter at Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, 14040-901, Brazil
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Schini A, De Canditiis B, Sanchez C, Pierrelee M, Voltz KE, Jourdainne L. Influence of cell specific parameters in a dielectric spectroscopy conversion model used to monitor viable cell density in bioreactors. Biotechnol J 2023; 18:e2300028. [PMID: 37318800 DOI: 10.1002/biot.202300028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Revised: 05/25/2023] [Accepted: 06/06/2023] [Indexed: 06/16/2023]
Abstract
In the biopharmaceutical industry, the use of mammalian cells to produce therapeutic proteins is becoming increasingly widespread. Monitoring of these cultures via different analysis techniques is essential to ensure a good quality product while respecting good manufacturing practice (GMP) regulations. Process Analytical Technologies (PAT) tools provide real-time measurements of the physiological state of the culture and enable process automation. Dielectric spectroscopy is a PAT that can be used to monitor the viable cell concentration (VCC) of living cells after processing raw permittivity data. Several modeling approaches exist and estimate biomass with different accuracy. The accuracy of the Cole-Cole and Maxwell Wagner's equations are studied here in the determination of the VCC and cell radius in Chinese hamster ovary (CHO) culture. A sensitivity analysis performed on the parameters entering the equations highlighted the importance of the cell specific parameters such as internal conductivity (σi ) and membrane capacitance (Cm ) in the accuracy of the estimation of VCC and cell radius. The most accurate optimization method found to improve the accuracy involves in-process adjustments of Cm and σi in the model equations with samplings from the bioreactor. This combination of offline and in situ data improved the estimation precision of the VCC by 69% compared to a purely mechanistic model without offline adjustments.
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Affiliation(s)
- Adèle Schini
- Millipore S.A.S. (an affiliate of Merck KGaA), Darmstadt, Germany
| | | | - Célia Sanchez
- Millipore S.A.S. (an affiliate of Merck KGaA), Darmstadt, Germany
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Davies SJ, Coyle D, Lindley EJ, Keane D, Belcher J, Caskey FJ, Dasgupta I, Davenport A, Farrington K, Mitra S, Ormandy P, Wilkie M, MacDonald J, Zanganeh M, Andronis L, Solis-Trapala I, Sim J. Bio-impedance spectroscopy added to a fluid management protocol does not improve preservation of residual kidney function in incident hemodialysis patients in a randomized controlled trial. Kidney Int 2023; 104:587-598. [PMID: 37263353 DOI: 10.1016/j.kint.2023.05.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Revised: 05/15/2023] [Accepted: 05/18/2023] [Indexed: 06/03/2023]
Abstract
Avoiding excessive dialysis-associated volume depletion may help preserve residual kidney function (RKF). To establish whether knowledge of the estimated normally hydrated weight from bioimpedance measurements (BI-NHW) when setting the post-hemodialysis target weight (TW) might mitigate rate of loss of RKF, we undertook an open label, randomized controlled trial in incident patients receiving HD, with clinicians and patients blinded to bioimpedance readings in controls. A total of 439 patients with over 500 ml urine/day or residual GFR exceeding 3 ml/min/1.73m2 were recruited from 34 United Kingdom centers and randomized 1:1, stratified by center. Fluid assessments were made for up to 24 months using a standardized proforma in both groups, supplemented by availability of BI-NHW in the intervention group. Primary outcome was time to anuria, analyzed using competing-risk survival models adjusted for baseline characteristics, by intention to treat. Secondary outcomes included rate of RKF decline (mean urea and creatinine clearance), blood pressure and patient-reported outcomes. There were no group differences in cause-specific hazard rates of anuria (0.751; 95% confidence interval (0.459, 1.229)) or sub-distribution hazard rates (0.742 (0.453, 1.215)). RKF decline was markedly slower than anticipated, pooled linear rates in year 1: -0.178 (-0.196, -0.159)), year 2: -0.061 (-0.086, -0.036)) ml/min/1.73m2/month. Blood pressure and patient-reported outcomes did not differ by group. The mean difference agreement between TW and BI-NHW was similar for both groups, Bioimpedance: -0.04 kg; Control: -0.25 kg. Thus, use of a standardized clinical protocol for fluid assessment when setting TW is associated with excellent preservation of RKF. Hence, bioimpedance measurements are not necessary to achieve this.
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Affiliation(s)
- Simon J Davies
- School of Medicine, Keele University, Keele, Staffordshire, UK.
| | - David Coyle
- NIHR Devices for Dignity, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, UK
| | | | - David Keane
- CÚRAM SFI Research Centre for Medical Devices, University of Galway, Galway, Ireland
| | - John Belcher
- School of Medicine, Keele University, Keele, Staffordshire, UK
| | - Fergus J Caskey
- Population Health Sciences, University of Bristol, Bristol, UK
| | - Indranil Dasgupta
- Renal Medicine, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
| | - Andrew Davenport
- UCL Department of Renal Medicine, Royal Free Hampstead NHS Trust, University College, London, UK
| | - Ken Farrington
- Renal Medicine, East & North Hertfordshire NHS Trust, Hertfordshire, UK
| | - Sandip Mitra
- Manchester Academic Health Sciences Centre (MAHSC), University Hospital Manchester, Manchester, UK
| | - Paula Ormandy
- School of Health and Society, University of Salford, Manchester, UK
| | - Martin Wilkie
- Renal Medicine, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, UK
| | - Jamie MacDonald
- Institute of Applied Human Physiology, Bangor University, Bangor, UK
| | - Mandana Zanganeh
- Centre for Health Economics at Warwick, University of Warwick, Coventry, UK
| | - Lazaros Andronis
- Centre for Health Economics at Warwick, University of Warwick, Coventry, UK
| | | | - Julius Sim
- School of Medicine, Keele University, Keele, Staffordshire, UK
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Company-Se G, Nescolarde L, Pajares V, Torrego A, Rafecas A, Rosell J, Riu PJ, Bragos R. Relaxation differences using EIS through bronchoscopy of healthy and pathological lung tissue. Annu Int Conf IEEE Eng Med Biol Soc 2023; 2023:1-4. [PMID: 38083442 DOI: 10.1109/embc40787.2023.10341117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2023]
Abstract
The use of electrical impedance spectroscopy for lung tissue differentiation is an opportunity for the improvement of clinical diagnosis. The aim of this work is to distinguish among different lung tissue states by evaluating the differences among impedance spectrum parameters between two separate frequencies (15 kHz and 307 kHz) in the beta dispersion region. In previous studies we have used single frequency measurements for tissue differentiation. Differences (P < 0.05) are found between those tissues that undergo an increase in tissue density (neoplasm and fibrosis) and those tissues that lead to tissue destruction (emphysema). Electrical impedance spectroscopy shows its utility for lung tissue differentiation for diagnosis improvement among pathologies with different tissue structure. Further studies are necessary for the differentiation among those tissue states that are more similar to each other.Clinical Relevance- Expand the diagnostic tools currently available in bronchoscopy by using minimally-invasive bioimpedance measurements to differentiate between lung patterns.
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Urbanowicz T, Michalak M, Marzec E, Komosa A, Filipiak KJ, Olasińska-Wiśniewska A, Witkowska A, Rodzki M, Tykarski A, Jemielity M. Coronary Artery Disease and Inflammatory Activation Interfere with Peripheral Tissue Electrical Impedance Spectroscopy Characteristics-Initial Report. Int J Environ Res Public Health 2023; 20:ijerph20032745. [PMID: 36768108 PMCID: PMC9915397 DOI: 10.3390/ijerph20032745] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Revised: 01/29/2023] [Accepted: 01/30/2023] [Indexed: 05/31/2023]
Abstract
BACKGROUND The electrical properties of cells and tissues in relation to energy exposure have been investigated, presenting their resistance and capacitance characteristics. The dielectric response to radiofrequency fields exhibits polarization heterogeneity under pathological conditions. The aim of the study was to analyze the differences in changes in resistance and capacitance measurements in the range from 1 kHz to 1 MHz, combined with an assessment of the correlation between the results of electrical impedance spectroscopy (EIS) and inflammatory activation. METHODS In the prospective study, EIS was performed on the non-dominant arm in 29 male patients (median (Q1-Q3) age of 69 (65-72)) with complex coronary artery disease and 10 male patients (median (Q1-Q3) age of 66 (62-69)) of the control group. Blood samples were collected for inflammatory index analysis. RESULTS The logistic regression analysis revealed a negative correlation with inflammatory indexes, including neutrophil to lymphocyte ratio (NLR) in the CAD group in the frequency of 30 kHz (p = 0.038, r = -0.317) regarding EIS resistance measurements and a positive correlation in CAD group in the frequency of 10 kHz (p = 0.029, r = -0.354) regarding EIS capacitance. CONCLUSIONS The bioelectric characteristics of peripheral tissues measured by resistance and capacitance in EIS differ in patients with coronary artery disease and in the control group. Electrical impedance spectroscopy reveals a statistically significant correlation with inflammatory markers in patients with CAD.
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Affiliation(s)
- Tomasz Urbanowicz
- Cardiac Surgery and Transplantology Department, Poznan University of Medical Sciences, 61-848 Poznan, Poland
| | - Michał Michalak
- Department of Computer Science and Statistics, Poznan University of Medical Sciences, 60-806 Poznan, Poland
| | - Ewa Marzec
- Department of Bionics and Experimental Medical Biology, Poznan University of Medical Sciences, 60-775 Poznan, Poland
| | - Anna Komosa
- Department of Hypertensiology, Angiology and Internal Medicine, Poznań University of Medical Sciences, 61-848 Poznan, Poland
| | - Krzysztof J. Filipiak
- Institute of Clinical Science, Maria Sklodowska-Curie Medical Academy, 00-136 Warsaw, Poland
| | - Anna Olasińska-Wiśniewska
- Cardiac Surgery and Transplantology Department, Poznan University of Medical Sciences, 61-848 Poznan, Poland
| | - Anna Witkowska
- Cardiac Surgery and Transplantology Department, Poznan University of Medical Sciences, 61-848 Poznan, Poland
| | - Michał Rodzki
- Cardiac Surgery and Transplantology Department, Poznan University of Medical Sciences, 61-848 Poznan, Poland
| | - Andrzej Tykarski
- Department of Hypertensiology, Angiology and Internal Medicine, Poznań University of Medical Sciences, 61-848 Poznan, Poland
| | - Marek Jemielity
- Cardiac Surgery and Transplantology Department, Poznan University of Medical Sciences, 61-848 Poznan, Poland
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12
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Stern Bauer T, Yakobi R, Hurevich M, Yitzchaik S, Hayouka Z. Impedimetric Bacterial Detection Using Random Antimicrobial Peptide Mixtures. Sensors (Basel) 2023; 23:561. [PMID: 36679359 PMCID: PMC9866871 DOI: 10.3390/s23020561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/09/2022] [Revised: 12/19/2022] [Accepted: 12/28/2022] [Indexed: 06/17/2023]
Abstract
The biosensing of bacterial pathogens is of a high priority. Electrochemical biosensors are an important future tool for rapid bacteria detection. A monolayer of bacterial-binding peptides can serve as a recognition layer in such detection devices. Here, we explore the potential of random peptide mixtures (RPMs) composed of phenylalanine and lysine in random sequences and of controlled length, to form a monolayer that can be utilized for sensing. RPMs were found to assemble in a thin and diluted layer that attracts various bacteria. Faradaic electrochemical impedance spectroscopy was used with modified gold electrodes to measure the charge-transfer resistance (RCT) caused due to the binding of bacteria to RPMs. Pseudomonas aeruginosa was found to cause the most prominent increase in RCT compared to other model bacteria. We show that the combination of highly accessible antimicrobial RPMs and electrochemical analysis can be used to generate a new promising line of bacterial biosensors.
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Affiliation(s)
- Tal Stern Bauer
- Institute of Biochemistry, Food Science and Nutrition, Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 76100, Israel
- Institute of Chemistry and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Ravit Yakobi
- Institute of Chemistry and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Mattan Hurevich
- Institute of Chemistry and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Shlomo Yitzchaik
- Institute of Chemistry and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
| | - Zvi Hayouka
- Institute of Biochemistry, Food Science and Nutrition, Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 76100, Israel
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13
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Nouaze JC, Kim JH, Jeon GR, Kim JH. Monitoring of Indoor Farming of Lettuce Leaves for 16 Hours Using Electrical Impedance Spectroscopy (EIS) and Double-Shell Model (DSM). Sensors (Basel) 2022; 22:9671. [PMID: 36560040 PMCID: PMC9788501 DOI: 10.3390/s22249671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/26/2022] [Revised: 12/05/2022] [Accepted: 12/07/2022] [Indexed: 06/17/2023]
Abstract
An electrical impedance spectroscopy (EIS) experiment was performed using a double-shell electrical model to investigate the feasibility of detecting physiological changes in lettuce leaves over 16 h. Four lettuce plants were used, and the impedance spectra of the leaves were measured five times per plant every hour at frequencies of 500 Hz and 300 kHz. Estimated R-C parameters were computed, and the results show that the lettuce leaves closely fit the double-shell model (DSM). The average resistance ratios of R1 = 10.66R4 and R1 = 3.34R2 show high resistance in the extracellular fluid (ECF). A rapid increase in resistance (R1, R2, and R4) and a decrease in capacitance (C3 and C5) during water uptake were observed. In contrast, a gradual decrease in resistance and an increase in capacitance were observed while the LED light was on. Comparative studies of leaf physiology and electrical value changes support the idea that EIS is a great technique for the early monitoring of plant growth for crop production.
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Affiliation(s)
- Joseph Christian Nouaze
- Department of Electronics Engineering, Pusan National University, Busan 46241, Republic of Korea
- CAS Corporation, Headquarters, R&D Center, Yangju 11415, Republic of Korea
| | - Jae Hyung Kim
- Corporate R&D Center, Hanwool Bio, Yangsan 50561, Republic of Korea
| | - Gye Rok Jeon
- Exsolit Research Center, Yangsan 50561, Republic of Korea
| | - Jae Ho Kim
- Department of Electronics Engineering, Pusan National University, Busan 46241, Republic of Korea
- Exsolit Research Center, Yangsan 50561, Republic of Korea
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14
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Randviir EP, Banks CE. A review of electrochemical impedance spectroscopy for bioanalytical sensors. Anal Methods 2022; 14:4602-4624. [PMID: 36342043 DOI: 10.1039/d2ay00970f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Electrochemical impedance spectroscopy (EIS) is a powerful technique for both quantitative and qualitative analysis. This review uses a systematic approach to examine how electrodes are tailored for use in EIS-based applications, describing the chemistries involved in sensor design, and discusses trends in the use of bio-based and non-bio-based electrodes. The review finds that immunosensors are the most prevalent sensor strategy that employs EIS as a quantification technique for target species. The review also finds that bio-based electrodes, though capable of detecting small molecules, are most applicable for the detection of complex molecules. Non-bio-based sensors are more often employed for simpler molecules and less often have applications for complex systems. We surmise that EIS has advanced in terms of electrode designs since our last review on the subject, although there are still inconsistencies in terms of equivalent circuit modelling for some sensor types. Removal of ambiguity from equivalent circuit models may help advance EIS as a choice detection method, allowing for lower limits of detection than traditional electrochemical methods such as voltammetry or amperometry.
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Affiliation(s)
- Edward P Randviir
- Department of Natural Sciences, Faculty of Science and Engineering, Manchester Metropolitan University, Chester Street, Manchester M1 5GD, Lancs, UK.
| | - Craig E Banks
- Department of Natural Sciences, Faculty of Science and Engineering, Manchester Metropolitan University, Chester Street, Manchester M1 5GD, Lancs, UK.
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15
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Ganguly A, Gunda V, Thai K, Prasad S. Inflammatory Stimuli Responsive Non-Faradaic, Ultrasensitive Combinatorial Electrochemical Urine Biosensor. Sensors (Basel) 2022; 22:7757. [PMID: 36298107 PMCID: PMC9611881 DOI: 10.3390/s22207757] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Revised: 09/28/2022] [Accepted: 10/01/2022] [Indexed: 06/16/2023]
Abstract
In this work, we propose a novel diagnostic biosensor that can enable stratification of disease states based on severity and hence allow for clear and actionable diagnoses. The scheme can potentially boost current Point-Of-Care (POC) biosensors for diseases that require time-critical stratification. Here, two key inflammatory biomarkers—Interleukin-8 and Interleukin-6—have been explored as proof of concept, and a four-class stratification of inflammatory disease severity is discussed. Our method is superior to traditional lab techniques as it is faster (<4 minutes turn-around time) and can work with any combination of disease biomarkers to categorize diseases by subtypes and severity. At its core, the biosensor relies on electrochemical impedance spectroscopy to transduce subtle inflammatory stimuli at the input for IL-8 and IL-6 for a limit of detection (LOD) of 1 pg/mL each. The biosensing scheme utilizes a two-stage random forest machine learning model for 4-state output disease classification with a 98.437% accuracy. This scheme can potentially boost the diagnostic power of current electrochemical biosensors for better precision therapy and improved patient outcomes.
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16
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Ozdalgic B, Gul M, Uygun ZO, Atçeken N, Tasoglu S. Emerging Applications of Electrochemical Impedance Spectroscopy in Tear Film Analysis. Biosensors (Basel) 2022; 12:827. [PMID: 36290964 PMCID: PMC9599721 DOI: 10.3390/bios12100827] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Revised: 09/20/2022] [Accepted: 09/24/2022] [Indexed: 06/16/2023]
Abstract
Human tear film, with a flow rate of 1-3 µL/min, is a rich bodily fluid that transmits a variety of metabolites and hormones containing proteins, lipids and electrolytes that provide clues about ocular and systemic diseases. Analysis of disease biomarkers such as proteins, mRNA, enzymes and cytokines in the tear film, collected by noninvasive methods, can provide significant results for sustaining a predictive, preventive and personalized medicine regarding various diseases such as glaucoma, diabetic retinopathy, keratoconus, dry eye, cancer, Alzheimer's disease, Parkinson's disease and COVID-19. Electrochemical impedance spectroscopy (EIS) offers a powerful technique for analyzing these biomarkers. EIS detects electrical equivalent circuit parameters related to biorecognition of receptor-analyte interactions on the electrode surface. This method is advantageous as it performs a label-free detection and allows the detection of non-electroactive compounds that cannot be detected by direct electron transfer, such as hormones and some proteins. Here, we review the opportunities regarding the integration of EIS into tear fluid sampling approaches.
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Affiliation(s)
- Berin Ozdalgic
- Department of Mechanical Engineering, Engineering Faculty, Koç University, Istanbul 34450, Türkiye
- Koç University Translational Medicine Research Center (KUTTAM), Koç University, Istanbul 34450, Türkiye
- Division of Optometry, School of Med Services & Techniques, Dogus University, Istanbul 34775, Türkiye
| | - Munire Gul
- Koç University Translational Medicine Research Center (KUTTAM), Koç University, Istanbul 34450, Türkiye
| | - Zihni Onur Uygun
- Department of Mechanical Engineering, Engineering Faculty, Koç University, Istanbul 34450, Türkiye
- Koç University Translational Medicine Research Center (KUTTAM), Koç University, Istanbul 34450, Türkiye
- Department of Biochemistry, Faculty of Medicine, Kafkas University, Kars 36100, Türkiye
| | - Nazente Atçeken
- Koç University Translational Medicine Research Center (KUTTAM), Koç University, Istanbul 34450, Türkiye
| | - Savas Tasoglu
- Department of Mechanical Engineering, Engineering Faculty, Koç University, Istanbul 34450, Türkiye
- Koç University Translational Medicine Research Center (KUTTAM), Koç University, Istanbul 34450, Türkiye
- Boğaziçi Institute of Biomedical Engineering, Boğaziçi University, Istanbul 34684, Türkiye
- Koç University Arçelik Research Center for Creative Industries (KUAR), Koç University, Istanbul 34450, Türkiye
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17
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Andrews G, Neveling O, De Beer DJ, Chirwa EMN, Brink HG, Joubert TH. Non-Destructive Impedance Monitoring of Bacterial Metabolic Activity towards Continuous Lead Biorecovery. Sensors (Basel) 2022; 22:7045. [PMID: 36146393 PMCID: PMC9501243 DOI: 10.3390/s22187045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/14/2022] [Revised: 09/11/2022] [Accepted: 09/14/2022] [Indexed: 06/16/2023]
Abstract
The adverse health effects of the presence of lead in wastewater streams are well documented, with conventional methods of lead recovery and removal suffering from disadvantages such as high energy costs, the production of toxic sludge, and low lead selectivity. Klebsiella pneumoniae and Paraclostridium bifermentans have been identified as potential lead-precipitating species for use in a lead recovery bioreactor. Electrical impedance spectroscopy (EIS) on a low-cost device is used to determine the potential for the probe-free and label-free monitoring of cell growth in a bioreactor containing these bacteria. A complex polynomial is fit for several reactive equivalent circuit components. A direct correlation is found between the extracted supercapacitance and the plated colony-forming unit count during the exponential growth phase, and a qualitative correlation is found between all elements of the measured reactance outside the exponential growth phase. Strong evidence is found that Pb(II) ions act as an anaerobic respiration co-substrate for both cells observed, with changes in plated count qualitatively mirrored in the Pb(II) concentration. Guidance is given on the implementation of EIS devices for continuous impedance monitoring.
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Affiliation(s)
- George Andrews
- Carl and Emily Fuchs Institute for Microelectronics (CEFIM), University of Pretoria, Pretoria 0002, South Africa
| | - Olga Neveling
- Department of Chemical Engineering, Faculty of Engineering, Built Environment and Information Technology, University of Pretoria, Pretoria 0002, South Africa
| | - Dirk Johannes De Beer
- Carl and Emily Fuchs Institute for Microelectronics (CEFIM), University of Pretoria, Pretoria 0002, South Africa
| | - Evans M. N. Chirwa
- Department of Chemical Engineering, Faculty of Engineering, Built Environment and Information Technology, University of Pretoria, Pretoria 0002, South Africa
| | - Hendrik G. Brink
- Department of Chemical Engineering, Faculty of Engineering, Built Environment and Information Technology, University of Pretoria, Pretoria 0002, South Africa
| | - Trudi-Heleen Joubert
- Carl and Emily Fuchs Institute for Microelectronics (CEFIM), University of Pretoria, Pretoria 0002, South Africa
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18
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Zhuang J, Zhu C, Han R, Steuer A, Kolb JF, Shi F. Uncertainty Quantification and Sensitivity Analysis for the Electrical Impedance Spectroscopy of Changes to Intercellular Junctions Induced by Cold Atmospheric Plasma. Molecules 2022; 27:molecules27185861. [PMID: 36144597 PMCID: PMC9503961 DOI: 10.3390/molecules27185861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Revised: 09/07/2022] [Accepted: 09/08/2022] [Indexed: 11/22/2022]
Abstract
The influence of pertinent parameters of a Cole-Cole model in the impedimetric assessment of cell-monolayers was investigated with respect to the significance of their individual contribution. The analysis enables conclusions on characteristics, such as intercellular junctions. Especially cold atmospheric plasma (CAP) has been proven to influence intercellular junctions which may become a key factor in CAP-related biological effects. Therefore, the response of rat liver epithelial cells (WB-F344) and their malignant counterpart (WB-ras) was studied by electrical impedance spectroscopy (EIS). Cell monolayers before and after CAP treatment were analyzed. An uncertainty quantification (UQ) of Cole parameters revealed the frequency cut-off point between low and high frequency resistances. A sensitivity analysis (SA) showed that the Cole parameters, R0 and α were the most sensitive, while Rinf and τ were the least sensitive. The temporal development of major Cole parameters indicates that CAP induced reversible changes in intercellular junctions, but not significant changes in membrane permeability. Sustained changes of τ suggested that long-lived ROS, such as H2O2, might play an important role. The proposed analysis confirms that an inherent advantage of EIS is the real time observation for CAP-induced changes on intercellular junctions, with a label-free and in situ method manner.
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Affiliation(s)
- Jie Zhuang
- Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, China
- School of Biomedical Engineering (Suzhou), Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 215000, China
| | - Cheng Zhu
- Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, China
- School of Biomedical Engineering (Suzhou), Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 215000, China
| | - Rui Han
- Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, China
- School of Biomedical Engineering (Suzhou), Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei 215000, China
| | - Anna Steuer
- Leibniz Institute for Plasma Science and Technology (INP), 17489 Greifswald, Germany
| | - Juergen F. Kolb
- Leibniz Institute for Plasma Science and Technology (INP), 17489 Greifswald, Germany
| | - Fukun Shi
- Suzhou Institute of Biomedical Engineering and Technology, Chinese Academy of Sciences, Suzhou 215163, China
- Correspondence: ; Tel.: +86-051269588135
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19
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Barhoum A, J Forster R. Label-free electrochemical immunosensor for picomolar detection of the cervical cancer biomarker MCM5. Anal Chim Acta 2022; 1225:340226. [PMID: 36038236 DOI: 10.1016/j.aca.2022.340226] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Revised: 07/28/2022] [Accepted: 07/31/2022] [Indexed: 01/15/2023]
Abstract
An immunosensor for label-free electrochemical detection of MiniChromosome Maintenance Protein 5, MCM5, a protein overexpressed in cervical cancer, based on a gold electrode is reported. The electrode was first modified with a submonolayer (capture layer) of 11-mercaptoundecanoic acid (11-MUA) and then activated with N-(3-dimethylaminopropyl)-N-ethylcarbodiimide hydrochloride (EDC) and N-hydroxysuccinimide (NHS) to immobilize the capture antibody. The change in electrode surface properties (wettability) during the formation of the 11-MUA layers was determined using the static water contact angle (WCA). The binding of MCM5 antigens to the capture antibody was monitored by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) using 5 mM [Fe(CN)6]3-/4- in 0.1 M LiClO4(aq) as an electroactive probe. AC Impedance was used to measure charge transfer resistance (Rct), which reflects impeded electron transfer when the antigen is bound to the antibody functionalized surface. After exposing the antibody-functionalized surface to MCM5 antigens, Rct increases linearly with the logarithmic value of MCM5 antigen concentration, with a linear dynamic range of 10-6 to 10-11 g/mL, a correlation coefficient of 0.99, and a detection limit of 2.9 pM (10-11 g/mL). This excellent sensitivity was achieved with simple preparation steps and minimal reagent consumption, without the need for complicated procedures such as enzymatic amplification, fluorescent labeling, or nanoparticle modification.
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Affiliation(s)
- Ahmed Barhoum
- National Centre for Sensor Research, School of Chemical Sciences, Dublin City University, Dublin, D09 V209, Ireland.
| | - Robert J Forster
- National Centre for Sensor Research, School of Chemical Sciences, Dublin City University, Dublin, D09 V209, Ireland
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20
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Fedacı C, Ertuğrul Uygun HD, Uygun ZO, Akçay Y. A novel biorecognition receptor Citropin-A modified impedimetric biosensor for detection of LNCaP prostate cancer cells. Anal Biochem 2022; 652:114772. [PMID: 35688260 DOI: 10.1016/j.ab.2022.114772] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Revised: 05/26/2022] [Accepted: 05/31/2022] [Indexed: 11/19/2022]
Abstract
In this study, Citropin-A (Cit-A) as a biorecognition receptor was used for the first time to develop electrochemical impedance spectroscopy (EIS) based biosensor for the detection of Lymph Node Carcinoma of the Prostate (LNCaP) cancer cells. The biosensor was engineered by modification of a gold electrode (AuE) with cysteamine (Cys), Poliamidoamin (PAMAM (G4)) dendrimers, avidin, and biotinylated Cit-A, respectively. The detection time of the LNCaP cells was determined as 300 s by chronoimpedance (CI). Chronoimpedance also provided an exact detection time to avoid non-specific adsorptions. The biosensor showed good linearity between 1500 cells/L and 12000 cells/L, limit of detection (LOD), and limit of quantification (LOQ) values were 518 cells/L and 1570 cells/L, respectively.
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Affiliation(s)
- Cemrehan Fedacı
- Ege University, Faculty of Medicine, Department of Medical Biochemistry, Bornova, İzmir, Turkey
| | | | - Zihni Onur Uygun
- Kafkas University, Faculty of Medicine, Department of Medical Biochemistry, Kars, Turkey.
| | - Yasemin Akçay
- Ege University, Faculty of Medicine, Department of Medical Biochemistry, Bornova, İzmir, Turkey
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21
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Fukase N, Duke VR, Lin MC, Stake IK, Huard M, Huard J, Marmor MT, Maharbiz MM, Ehrhart NP, Bahney CS, Herfat ST. Wireless Measurements Using Electrical Impedance Spectroscopy to Monitor Fracture Healing. Sensors (Basel) 2022; 22:s22166233. [PMID: 36016004 PMCID: PMC9412277 DOI: 10.3390/s22166233] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2022] [Revised: 08/12/2022] [Accepted: 08/16/2022] [Indexed: 05/05/2023]
Abstract
There is an unmet need for improved, clinically relevant methods to longitudinally quantify bone healing during fracture care. Here we develop a smart bone plate to wirelessly monitor healing utilizing electrical impedance spectroscopy (EIS) to provide real-time data on tissue composition within the fracture callus. To validate our technology, we created a 1-mm rabbit tibial defect and fixed the bone with a standard veterinary plate modified with a custom-designed housing that included two impedance sensors capable of wireless transmission. Impedance magnitude and phase measurements were transmitted every 48 h for up to 10 weeks. Bone healing was assessed by X-ray, µCT, and histology. Our results indicated the sensors successfully incorporated into the fracture callus and did not impede repair. Electrical impedance, resistance, and reactance increased steadily from weeks 3 to 7-corresponding to the transition from hematoma to cartilage to bone within the fracture gap-then plateaued as the bone began to consolidate. These three electrical readings significantly correlated with traditional measurements of bone healing and successfully distinguished between union and not-healed fractures, with the strongest relationship found with impedance magnitude. These results suggest that our EIS smart bone plate can provide continuous and highly sensitive quantitative tissue measurements throughout the course of fracture healing to better guide personalized clinical care.
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Affiliation(s)
- Naomasa Fukase
- Linda and Mitch Hart Center for Regenerative & Personalized Medicine at the Steadman Philippon Research Institute, Vail, CO 81657, USA
| | - Victoria R. Duke
- Linda and Mitch Hart Center for Regenerative & Personalized Medicine at the Steadman Philippon Research Institute, Vail, CO 81657, USA
| | - Monica C. Lin
- UCSF Orthopaedic Trauma Institute, Zuckerberg San Francisco General Hospital, San Francisco, CA 94110, USA
- Department of Bioengineering, University of California, Berkeley, CA 94720, USA
| | - Ingrid K. Stake
- Linda and Mitch Hart Center for Regenerative & Personalized Medicine at the Steadman Philippon Research Institute, Vail, CO 81657, USA
- Department of Orthopaedic Surgery, Ostfold Hospital Trust, 1714 Graalum, Norway
| | - Matthieu Huard
- Linda and Mitch Hart Center for Regenerative & Personalized Medicine at the Steadman Philippon Research Institute, Vail, CO 81657, USA
| | - Johnny Huard
- Linda and Mitch Hart Center for Regenerative & Personalized Medicine at the Steadman Philippon Research Institute, Vail, CO 81657, USA
| | - Meir T. Marmor
- UCSF Orthopaedic Trauma Institute, Zuckerberg San Francisco General Hospital, San Francisco, CA 94110, USA
| | - Michel M. Maharbiz
- Department of Bioengineering, University of California, Berkeley, CA 94720, USA
- Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, CA 94720, USA
- Chan Zuckerberg Biohub, San Francisco, CA 94158, USA
| | - Nicole P. Ehrhart
- Department of Clinical Sciences, Flint Animal Cancer Center, College of Veterinary Medicine, Colorado State University, Fort Collins, CO 80523, USA
| | - Chelsea S. Bahney
- Linda and Mitch Hart Center for Regenerative & Personalized Medicine at the Steadman Philippon Research Institute, Vail, CO 81657, USA
- UCSF Orthopaedic Trauma Institute, Zuckerberg San Francisco General Hospital, San Francisco, CA 94110, USA
- Correspondence: (C.S.B.); (S.T.H.)
| | - Safa T. Herfat
- UCSF Orthopaedic Trauma Institute, Zuckerberg San Francisco General Hospital, San Francisco, CA 94110, USA
- Correspondence: (C.S.B.); (S.T.H.)
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22
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Ben Atitallah B, Kallel AY, Bouchaala D, Derbel N, Kanoun O. Comparative Study of Measurement Methods for Embedded Bioimpedance Spectroscopy Systems. Sensors (Basel) 2022; 22:5801. [PMID: 35957369 PMCID: PMC9371087 DOI: 10.3390/s22155801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Revised: 07/22/2022] [Accepted: 07/27/2022] [Indexed: 06/15/2023]
Abstract
Bioimpedance spectroscopy (BIS) is an advanced measurement method for providing information on impedance changes at several frequencies by injecting a low current into a device under test and analyzing the response voltage. Several methods have been elaborated for BIS measurement, calculating impedance with a gain phase detector (GPD), IQ demodulation, and fast Fourier transform (FFT). Although the measurement method has a big influence on the measurement system performance, a systematical comparative study has not been performed yet. In this paper, we compare them based on simulations and experimental studies. To maintain similar conditions in the implementation of all methods, we use the same signal generator followed by a voltage-controlled current source (VCCS) as a signal generator. For performance analysis, three DUTs have been designed to imitate the typical behavior of biological tissues. A laboratory impedance analyzer is used as a reference. The comparison addresses magnitude measurement accuracy, phase measurement accuracy, signal processing, hardware complexity, and power consumption. The result shows that the FFT-based system excels with high accuracy for amplitude and phase measurement while providing the lowest hardware complexity, and power consumption, but it needs a much higher software complexity.
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Affiliation(s)
- Bilel Ben Atitallah
- Faculty of Electrical Engineering and Information Technology, Chemnitz University of Technology, 09111 Chemnitz, Germany; (A.Y.K.); (O.K.)
- National Engineering School of Sfax, University of Sfax, Sfax 3038, Tunisia; (D.B.); (N.D.)
| | - Ahmed Yahia Kallel
- Faculty of Electrical Engineering and Information Technology, Chemnitz University of Technology, 09111 Chemnitz, Germany; (A.Y.K.); (O.K.)
| | - Dhouha Bouchaala
- National Engineering School of Sfax, University of Sfax, Sfax 3038, Tunisia; (D.B.); (N.D.)
| | - Nabil Derbel
- National Engineering School of Sfax, University of Sfax, Sfax 3038, Tunisia; (D.B.); (N.D.)
| | - Olfa Kanoun
- Faculty of Electrical Engineering and Information Technology, Chemnitz University of Technology, 09111 Chemnitz, Germany; (A.Y.K.); (O.K.)
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Chavez-Bourgeois M, Ribero S, Barreiro A, Espinoza N, Carrera C, Garcia A, Alos L, Puig S, Malvehy J. Reflectance Confocal Microscopy and Electrical Impedance Spectroscopy in the Early Detection of Melanoma in Changing Lesions during Long-term Follow-up of Very High-risk Patients. Acta Derm Venereol 2022; 102:adv00751. [PMID: 35535641 PMCID: PMC9558334 DOI: 10.2340/actadv.v102.1105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Electrical impedance spectroscopy has clinical relevance in diagnosing malignancy in melanocytic lesions. Sixty-eight lesions with changes during digital follow-up of patients at very high risk of developing melanoma were prospectively included in this study from February to December 2016. Electrical impedance spectroscopy and reflectance confocal microscopy were performed to evaluate their performance in this subset of difficult lesions. Forty-six lesions were considered suspicious on reflectance confocal microscopy and were excised, of these, 19 were diagnosed as melanoma. Fifteen melanomas were detected by electrical impedance spectroscopy, while 4 received a score lower than 4, which suggested no malignancy. The addition of reflectance confocal microscopy improves accuracy while maintaining the same sensitivity. In the case of electrical impedance spectroscopy scores <4, lesions exhibiting changes in follow-up may need short-term monitoring or excision if dermoscopy shows criteria for melanoma. Results of electrical impedance spectroscopy in this subset of very early lesions should be carefully considered due to the risk of false negatives.
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Affiliation(s)
| | | | | | | | | | | | | | - Susana Puig
- Melanoma Unit, Dermatology Department, Hospital Clinic Barcelona, Villarroel 170, ES-08036, Barcelona, Spain.
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Leo A, Monteduro AG, Rizzato S, Milone A, Maruccio G. Miniaturized Sensors for Detection of Ethanol in Water Based on Electrical Impedance Spectroscopy and Resonant Perturbation Method—A Comparative Study. Sensors 2022; 22:s22072742. [PMID: 35408357 PMCID: PMC9003094 DOI: 10.3390/s22072742] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/20/2022] [Revised: 03/30/2022] [Accepted: 04/01/2022] [Indexed: 12/02/2022]
Abstract
The development of highly sensitive, portable and low-cost sensors for the evaluation of ethanol content in liquid is particularly important in several monitoring processes, from the food industry to the pharmaceutical industry. In this respect, we report the optimization of two sensing approaches based on electrical impedance spectroscopy (EIS) and complementary double split ring resonators (CDSRRs) for the detection of ethanol in water. Miniaturized EIS sensors were realized with interdigitated electrodes, and the ethanol sensing was carried out in liquid solutions without any functionalization of the electrodes. Impedance fitting analysis, with an equivalent circuit over a frequency range from 100 Hz to 1 MHz, was performed to estimate the electric parameters, which allowed us to evaluate the amount of ethanol in water solutions. On the other hand, complementary double split ring resonators (CDSRRs) were optimized by adjusting the device geometry to achieve higher quality factors while operating at a low fundamental frequency despite the small size (useful for compact electronic packaging). Both sensors were found to be efficient for the detection of low amounts of ethanol in water, even in the presence of salts. In particular, EIS sensors proved to be effective in performing a broadband evaluation of ethanol concentration and are convenient when low cost is the priority. On the other end, the employment of split ring resonators allowed us to achieve a very low limit of detection of 0.2 v/v%, and provides specific advantages in the case of known environments where they can enable fast real-time single-frequency measurements.
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Devarakonda S, Ganapathysubramanian B, Shrotriya P. Impedance-Based Nanoporous Anodized Alumina/ITO Platforms for Label-Free Biosensors. ACS Appl Mater Interfaces 2022; 14:150-158. [PMID: 34937345 DOI: 10.1021/acsami.1c17243] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
We report an experimental and computational approach for the fabrication and characterization of a highly sensitive and responsive label-free biosensor that does not require the presence of redox couples in electrolytes for sensitive electrochemical detection. The sensor is based on an aptamer-functionalized transparent electrode composed of nanoporous anodized alumina (NAA) grown on indium tin oxide (ITO)-covered glass. Electrochemical impedance changes in a thrombin binding aptamer (TBA)-functionalized NAA/ITO/glass electrode due to specific binding of α-thrombin are monitored for protein detection. The aptamer-functionalized electrode enables sensitive and specific thrombin protein detection with a detection limit of ∼10 pM and a high signal-to-noise ratio. The transient impedance of the alumina film-covered surface is computed using a computational electrochemical impedance spectroscopy (EIS) approach and compared to experimental observations to identify the dominant mechanisms underlying the sensor response. The computational and experimental results indicate that the sensing response is due to the modified ionic transport under the combined influence of steric hindrance and surface charge modification due to ligand/receptor binding between α-thrombin and the aptamer-covered alumina film. These results suggest that alumina film-covered electrodes utilize both steric and charge modulation for sensing, leading to tremendous improvement in the sensitivity and signal-to-noise ratio. The film configuration is amenable for miniaturization and can be readily incorporated into existing portable sensing systems.
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Affiliation(s)
- Sivaranjani Devarakonda
- Department of Mechanical Engineering, Iowa State University, Ames, Iowa 50011, United States
| | | | - Pranav Shrotriya
- Department of Mechanical Engineering, Iowa State University, Ames, Iowa 50011, United States
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Khan MI, Muhammad N, Tariq M, Nishan U, Razaq A, Saleh TA, Haija MA, Ismail I, Rahim A. Non-enzymatic electrochemical dopamine sensing probe based on hexagonal shape zinc-doped cobalt oxide (Zn-Co 2O 4) nanostructure. Mikrochim Acta 2021; 189:37. [PMID: 34958414 DOI: 10.1007/s00604-021-05142-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Accepted: 12/08/2021] [Indexed: 10/19/2022]
Abstract
A non-enzymatic dopamine electrochemical sensing probe was developed. A hexagonal shape zinc-doped cobalt oxide (Zn-Co2O4) nanostructure was prepared by a facile hydrothermal approach. The combination of Zn, which has an abundance of electrons, and Co3O4 exhibited a synergistically electron-rich nanocomposite. The crystallinity of the nanostructure was investigated using X-ray diffraction. A scanning electron microscope (SEM) was used to examine the surface morphology, revealing hexagonal nanoparticles with an average particle size of 400 nm. High-resolution transmission electron microscopy (HR-TEM) was used to confirm the nanostructure of the doped material. The nanostructure's bonding and functional groups were verified using Fourier transform infrared spectroscopy (FTIR). The electrochemical characterization was conducted by using electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV), and amperometry. The resistivity of the electrode was confirmed through EIS and showed that the bare glassy carbon electrode (GCE) exhibited higher charge transfer resistance as compared to modified Zn-Co2O4/GCE. The sensing probe was developed by modifying the surface of GCE with Zn-Co2O4 nanostructure and tested as an electrochemical sensor for dopamine oxidation; it operated best at a working potential of 0.17 V (vs Ag/AgCl). The developed sensor exhibited a low limit of detection (0.002 µM), a high sensitivity (126 µA. µM-1 cm-2), and a wide linear range (0.2 to 185 µM). The sensor showed a short response time of < 1 s. The sensor's selectivity was investigated in the presence of coexisting species (uric acid, ascorbic acid, adrenaline, epinephrine, norepinephrine, histamine, serotonin, tyramine, phenethylamine, and glucose) with no effects on dopamine determination results. The developed sensor was also successfully used for determining dopamine concentrations in a real sample.
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Affiliation(s)
- Muhammad Inam Khan
- Interdisciplinary Research Centre in Biomedical Materials (IRCBM), COMSATS University Islamabad, Lahore Campus, Defence Road, Off Raiwind Road Lahore, Islamabad, 54000, Pakistan
- Department of Physics, COMSATS University Islamabad, Lahore Campus, Defence Road, Off Raiwind Road Lahore, Islamabad, 54000, Pakistan
| | - Nawshad Muhammad
- Department of Dental Materials, Institute of Basic Medical Sciences, Khyber Medical University, Peshawar, KPK, Pakistan
| | - Muhammad Tariq
- National Centre of Excellence in Physical Chemistry, University of Peshawar, Peshawar, Pakistan
| | - Umar Nishan
- Department of Chemistry, Kohat University of Science and Technology, Kohat, KPK, Pakistan
| | - Aamir Razaq
- Department of Physics, COMSATS University Islamabad, Lahore Campus, Defence Road, Off Raiwind Road Lahore, Islamabad, 54000, Pakistan
| | - Tawfik A Saleh
- Department of Chemistry, King Fahd University of Petroleum & Minerals, Dhahran, 31261, Saudi Arabia.
| | - Mohammad Abu Haija
- Department of Chemistry, Khalifa University, P.O. Box 127788, Abu Dhabi, United Arab Emirates
| | - Issam Ismail
- Department of Chemical Engineering, Khalifa University of Science and Technology, P.O. Box 127788, Abu Dhabi, United Arab Emirates
| | - Abdur Rahim
- Interdisciplinary Research Centre in Biomedical Materials (IRCBM), COMSATS University Islamabad, Lahore Campus, Defence Road, Off Raiwind Road Lahore, Islamabad, 54000, Pakistan.
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Feng XQ, Ju Y, Dou WT, Li Q, Jin ZG, He XP, James TD, Ye BC. Ferrocene-Labelled Electroactive Aptamer-Based Sensors (Aptasensors) for Glycated Haemoglobin. Molecules 2021; 26:7077. [PMID: 34885660 PMCID: PMC8659020 DOI: 10.3390/molecules26237077] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2021] [Revised: 11/14/2021] [Accepted: 11/19/2021] [Indexed: 11/30/2022] Open
Abstract
Glycated haemoglobin (HbA1c) is a diagnostic biomarker for type 2 diabetes. Traditional analytical methods for haemoglobin (Hb) detection rely on chromatography, which requires significant instrumentation and is labour-intensive; consequently, miniaturized devices that can rapidly sense HbA1c are urgently required. With this research, we report on an aptamer-based sensor (aptasensor) for the rapid and selective electrochemical detection of HbA1c. Aptamers that specifically bind HbA1c and Hb were modified with a sulfhydryl and ferrocene group at the 3' and 5'-end, respectively. The modified aptamers were coated through sulfhydryl-gold self-assembly onto screen printed electrodes, producing aptasensors with built in electroactivity. When haemoglobin was added to the electrodes, the current intensity of the ferrocene in the sensor system was reduced in a concentration-dependent manner as determined by differential pulse voltammetry. In addition, electrochemical impedance spectroscopy confirmed selective binding of the analytes to the aptamer-coated electrode. This research offers new insight into the development of portable electrochemical sensors for the detection of HbA1c.
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Affiliation(s)
- Xue-Qing Feng
- Laboratory of Biosystem and Microanalysis, State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China; (X.-Q.F.); (Y.J.)
- Shanghai Center for Clinical Laboratory, Shanghai 200237, China; (Q.L.); (Z.-G.J.)
| | - Yi Ju
- Laboratory of Biosystem and Microanalysis, State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China; (X.-Q.F.); (Y.J.)
- Shanghai Center for Clinical Laboratory, Shanghai 200237, China; (Q.L.); (Z.-G.J.)
| | - Wei-Tao Dou
- Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, Frontiers Center for Materiobiology and Dynamic Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Rd., Shanghai 200237, China;
| | - Qing Li
- Shanghai Center for Clinical Laboratory, Shanghai 200237, China; (Q.L.); (Z.-G.J.)
| | - Zhong-Gan Jin
- Shanghai Center for Clinical Laboratory, Shanghai 200237, China; (Q.L.); (Z.-G.J.)
| | - Xiao-Peng He
- Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, Frontiers Center for Materiobiology and Dynamic Chemistry, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Rd., Shanghai 200237, China;
| | - Tony D. James
- Department of Chemistry, University of Bath, Bath BA2 7AY, UK
- School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang 453007, China
| | - Bang-Ce Ye
- Laboratory of Biosystem and Microanalysis, State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai 200237, China; (X.-Q.F.); (Y.J.)
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Bhatt G, Gupta S, Ramanathan G, Bhattacharya S. Integrated DEP assisted detection of PCR products with metallic nanoparticle labels through impedance spectroscopy. IEEE Trans Nanobioscience 2021; 21:502-510. [PMID: 34752399 DOI: 10.1109/tnb.2021.3127111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Electrochemical impedance spectroscopy (EIS) is gaining immense popularity in the current times due to the ease of integration with microelectronics. Keeping this aspect in mind, various detection schemes have been developed to make impedance detection of nucleic acids more specific. In this context, the current work makes a strong case for specific DNA detection through EIS using nanoparticle labeling approach and also an added selectivity step through the use of dielectrophoresis (DEP), which enhances the detection sensitivity and specificity to match the detection capability of quantitative polymerase chain reaction (qPCR) in real-time context as compared to the individually amplified DNA 1. The detection limit of the proposed biochip is observed to be 3-4 PCR cycles for 582 bp bacterial DNA, where the complete procedure of detection starts in less than 10 min. The process of integrated DEP capture of labeled products coming out of PCR and their impedance-assisted detection is carried out in an in-house micro-fabricated biochip. The gold nanoparticles, which possess excellent optical, chemical, electronic, and biocompatibility properties and are capable of generating lump-like DNA structure without modifying its basic impedance signature are introduced to the amplified DNA through the nanoparticle labeled primers.
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29
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Otagiri R, Kawai H, Takatsuka M, Shinyashiki N, Ito A, Ikeguchi R, Aoyama T. Interfacial polarization of in vivo rat sciatic nerve with crush injury studied via broadband dielectric spectroscopy. PLoS One 2021; 16:e0252589. [PMID: 34077459 PMCID: PMC8171940 DOI: 10.1371/journal.pone.0252589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Accepted: 05/18/2021] [Indexed: 12/02/2022] Open
Abstract
Electrical stimulation is one of the candidates for elongation-driven regeneration of damaged peripheral nerves. Different organs and tissues have an inherent cell structure and size. This leads to variation in the tissue-specific electrical properties of the frequency of interfacial polarization. Although nervous tissues have a membrane potential, the electrical reaction inside these tissues following electrical stimulation from outside remains unexplored. Furthermore, the pathophysiological reaction of an injured nerve is unclear. Here, we investigated the electrical reaction of injured and non-injured rat sciatic nerves via broadband dielectric spectroscopy. Crush injured and non-injured sciatic nerves of six 12-week-old male Lewis rats were used, 6 days after infliction of the injury. Both sides of the nerves (with and without injury) were exposed, and impedance measurements were performed at room temperature (approximately 25°C) at frequencies ranging from 100 mHz to 5.5 MHz and electric potential ranging from 0.100 to 1.00 V. The measured interfacial polarization potentially originated from the polarization by ion transport around nerve membranes at frequencies between 3.2 kHz and 1.6 MHz. The polarization strength of the injured nerves was smaller than that of non-injured nerves. However, the difference in polarization between injured and non-injured nerves might be caused by inflammation and edema. The suitable frequency range of the interfacial polarization can be expected to be critical for electrical stimulation of injured peripheral nerves.
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Affiliation(s)
- Risa Otagiri
- Course of Physics, Graduate School of Science, Tokai University, Hiratsuka City, Kanagawa, Japan
| | - Hideki Kawai
- Department of Physical Therapy, Human Health Sciences, Graduate school of Medicine, Kyoto University, Kyoto City, Kyoto, Japan
| | - Masanobu Takatsuka
- Course of Science and Technology, Graduate School of Science and Technology, Tokai University, Hiratsuka City, Kanagawa, Japan
| | - Naoki Shinyashiki
- Department of Physics, School of Science, Tokai University, Hiratsuka City, Kanagawa, Japan
| | - Akira Ito
- Department of Physical Therapy, Human Health Sciences, Graduate school of Medicine, Kyoto University, Kyoto City, Kyoto, Japan
| | - Ryosuke Ikeguchi
- Department of Orthopaedic Surgery, Kyoto University Graduate School of Medicine, Kyoto City, Kyoto, Japan
| | - Tomoki Aoyama
- Department of Physical Therapy, Human Health Sciences, Graduate school of Medicine, Kyoto University, Kyoto City, Kyoto, Japan
- * E-mail:
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Fedewa MV, Sullivan K, Hornikel B, Holmes CJ, Metoyer CJ, Esco MR. Accuracy of a Mobile 2D Imaging System for Body Volume and Subsequent Composition Estimates in a Three-Compartment Model. Med Sci Sports Exerc 2021; 53:1003-1009. [PMID: 33086268 PMCID: PMC8750560 DOI: 10.1249/mss.0000000000002550] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
PURPOSE The purpose of the study was to compare a single two-dimensional image processing system (IMAGE) to underwater weighing (UWW) for measuring body volume (BV) and subsequently estimating body fat percentage (%Fat), fat mass (FM), and fat-free mass (FFM) via a 3-compartment (3C) model. METHODS A sample of participants age 18-39 yr was recruited for this study (n = 67, 47.8% female). BV was measured with UWW and predicted via the IMAGE software. The BV estimates from UWW (3CUWW) and IMAGE (3CIMAGE) were separately combined with constant total body water and body mass values for 3C model calculation of %Fat, FM, and FFM. RESULTS BV obtained from the IMAGE was 67.76 ± 12.19 and 67.72 ± 12.04 L from UWW, which was not significantly different (P = 0.578) and very largely correlated (r = 0.99, P < 0.001). When converted to %Fat (3CUWW = 21.01% ± 7.30%, 3CIMAGE = 21.08% ± 7.04%, P = 0.775), FM (3CUWW = 14.68 ± 5.15 kg, 3CIMAGE = 14.78 ± 5.08 kg, P = 0.578), and FFM (3CUWW = 57.00 ± 13.20 kg, 3CIMAGE = 56.90 ± 12.84 kg, P = 0.578) with the 3C model, no significant mean differences and very large correlations (r values ranged from 0.96 to 0.99) were observed. In addition, the standard error of estimate, total error, and 95% limits of agreement for all three metrics were small and considered acceptable. CONCLUSIONS An IMAGE system provides valid estimates of BV that accurately estimates body composition in a 3C model.
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Affiliation(s)
- Michael V Fedewa
- Exercise Physiology Laboratory, Department of Kinesiology, The University of Alabama, Tuscaloosa, AL
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31
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Bhat VJ, Vegesna SV, Kiani M, Zhao X, Blaschke D, Du N, Vogel M, Kluge S, Raff J, Hübner U, Skorupa I, Rebohle L, Schmidt H. Detecting Bacterial Cell Viability in Few µL Solutions from Impedance Measurements on Silicon-Based Biochips. Int J Mol Sci 2021; 22:ijms22073541. [PMID: 33805483 PMCID: PMC8037661 DOI: 10.3390/ijms22073541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Revised: 03/25/2021] [Accepted: 03/26/2021] [Indexed: 11/20/2022] Open
Abstract
Using two different types of impedance biochips (PS5 and BS5) with ring top electrodes, a distinct change of measured impedance has been detected after adding 1–5 µL (with dead or live Gram-positive Lysinibacillus sphaericus JG-A12 cells to 20 µL DI water inside the ring top electrode. We relate observed change of measured impedance to change of membrane potential of L. sphaericus JG-A12 cells. In contrast to impedance measurements, optical density (OD) measurements cannot be used to distinguish between dead and live cells. Dead L. sphaericus JG-A12 cells have been obtained by adding 0.02 mg/mL of the antibiotics tetracycline and 0.1 mg/mL chloramphenicol to a batch with OD0.5 and by incubation for 24 h, 30 °C, 120 rpm in the dark. For impedance measurements, we have used batches with a cell density of 25.5 × 108 cells/mL (OD8.5) and 270.0 × 108 cells/mL (OD90.0). The impedance biochip PS5 can be used to detect the more resistive and less capacitive live L. sphaericus JG-A12 cells. Also, the impedance biochip BS5 can be used to detect the less resistive and more capacitive dead L. sphaericus JG-A12 cells. An outlook on the application of the impedance biochips for high-throughput drug screening, e.g., against multi-drug-resistant Gram-positive bacteria, is given.
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Affiliation(s)
- Vinayak J. Bhat
- Leibniz Institute of Photonic Technology, Albert-Einstein-Str. 9, 07745 Jena, Germany; (V.J.B.); (D.B.); (U.H.)
| | - Sahitya V. Vegesna
- Leibniz Institute of Photonic Technology, Albert-Einstein-Str. 9, 07745 Jena, Germany; (V.J.B.); (D.B.); (U.H.)
- Correspondence: (S.V.V.); (N.D.); (H.S.)
| | - Mahdi Kiani
- Center for Microtechnologies, Chemnitz University of Technology, 09126 Chemnitz, Germany; (M.K.); (X.Z.)
| | - Xianyue Zhao
- Center for Microtechnologies, Chemnitz University of Technology, 09126 Chemnitz, Germany; (M.K.); (X.Z.)
| | - Daniel Blaschke
- Leibniz Institute of Photonic Technology, Albert-Einstein-Str. 9, 07745 Jena, Germany; (V.J.B.); (D.B.); (U.H.)
| | - Nan Du
- Leibniz Institute of Photonic Technology, Albert-Einstein-Str. 9, 07745 Jena, Germany; (V.J.B.); (D.B.); (U.H.)
- Institute for Solid State Physics, Friedrich Schiller University Jena, Helmholtzweg 3, 07743 Jena, Germany
- Correspondence: (S.V.V.); (N.D.); (H.S.)
| | - Manja Vogel
- Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany; (M.V.); (S.K.); (J.R.); (I.S.); (L.R.)
| | - Sindy Kluge
- Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany; (M.V.); (S.K.); (J.R.); (I.S.); (L.R.)
| | - Johannes Raff
- Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany; (M.V.); (S.K.); (J.R.); (I.S.); (L.R.)
| | - Uwe Hübner
- Leibniz Institute of Photonic Technology, Albert-Einstein-Str. 9, 07745 Jena, Germany; (V.J.B.); (D.B.); (U.H.)
| | - Ilona Skorupa
- Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany; (M.V.); (S.K.); (J.R.); (I.S.); (L.R.)
| | - Lars Rebohle
- Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany; (M.V.); (S.K.); (J.R.); (I.S.); (L.R.)
| | - Heidemarie Schmidt
- Leibniz Institute of Photonic Technology, Albert-Einstein-Str. 9, 07745 Jena, Germany; (V.J.B.); (D.B.); (U.H.)
- Institute for Solid State Physics, Friedrich Schiller University Jena, Helmholtzweg 3, 07743 Jena, Germany
- Correspondence: (S.V.V.); (N.D.); (H.S.)
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Attia J, Nir S, Mervinetsky E, Balogh D, Gitlin-Domagalska A, Alshanski I, Reches M, Hurevich M, Yitzchaik S. Non-covalently embedded oxytocin in alkanethiol monolayer as Zn 2+ selective biosensor. Sci Rep 2021; 11:7051. [PMID: 33782419 PMCID: PMC8007701 DOI: 10.1038/s41598-021-85015-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Accepted: 02/23/2021] [Indexed: 11/29/2022] Open
Abstract
Peptides are commonly used as biosensors for analytes such as metal ions as they have natural binding preferences. In our previous peptide-based impedimetric metal ion biosensors, a monolayer of the peptide was anchored covalently to the electrode. Binding of metal ions resulted in a conformational change of the oxytocin peptide in the monolayer, which was measured using electrochemical impedance spectroscopy. Here, we demonstrate that sensing can be achieved also when the oxytocin is non-covalently integrated into an alkanethiol host monolayer. We show that ion-binding cause morphological changes to the dense host layer, which translates into enhanced impedimetric signals compared to direct covalent assembly strategies. This biosensor proved selective and sensitive for Zn2+ ions in the range of nano- to micro-molar concentrations. This strategy offers an approach to utilize peptide flexibility in monitoring their response to the environment while embedded in a hydrophobic monolayer.
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Affiliation(s)
- Jessica Attia
- The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, 91904, Jerusalem, Israel
- The Harvey M. Krueger Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Edmond J. Safra Campus, 91904, Jerusalem, Israel
| | - Sivan Nir
- The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, 91904, Jerusalem, Israel
- The Harvey M. Krueger Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Edmond J. Safra Campus, 91904, Jerusalem, Israel
| | - Evgeniy Mervinetsky
- The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, 91904, Jerusalem, Israel
- The Harvey M. Krueger Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Edmond J. Safra Campus, 91904, Jerusalem, Israel
| | - Dora Balogh
- The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, 91904, Jerusalem, Israel
- The Harvey M. Krueger Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Edmond J. Safra Campus, 91904, Jerusalem, Israel
| | - Agata Gitlin-Domagalska
- The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, 91904, Jerusalem, Israel
- Faculty of Chemistry, Department of Molecular Biochemistry, University of Gdansk, Wita Stwosza 63, 80-308, Gdansk, Poland
| | - Israel Alshanski
- The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, 91904, Jerusalem, Israel
- The Harvey M. Krueger Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Edmond J. Safra Campus, 91904, Jerusalem, Israel
| | - Meital Reches
- The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, 91904, Jerusalem, Israel.
- The Harvey M. Krueger Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Edmond J. Safra Campus, 91904, Jerusalem, Israel.
| | - Mattan Hurevich
- The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, 91904, Jerusalem, Israel.
- The Harvey M. Krueger Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Edmond J. Safra Campus, 91904, Jerusalem, Israel.
| | - Shlomo Yitzchaik
- The Institute of Chemistry, The Hebrew University of Jerusalem, Edmond J. Safra Campus, 91904, Jerusalem, Israel.
- The Harvey M. Krueger Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem, Edmond J. Safra Campus, 91904, Jerusalem, Israel.
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Liang Y, Ji L, Tu T, Zhang S, Liang B, Ye X. In situ continuously monitoring of cancer cell invasion process based on impedance sensing. Anal Biochem 2021; 622:114155. [PMID: 33736970 DOI: 10.1016/j.ab.2021.114155] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Revised: 03/02/2021] [Accepted: 03/04/2021] [Indexed: 02/06/2023]
Abstract
Activation of invasion and metastasis is recognized as one of the hallmarks of cancer. There are 90% of cancer-related deaths due to metastasis and given that it is worthy of note to study cancer progression and metastasis. Owing to restricted tools used to underpin the study of tumor invasion process, an on-site platform was developed to monitor this event in vitro. We used interdigital gold electrodes to monitor the dynamic process of cancer cells invading into extracellular matrix in situ continuously. Influences of collagen concentration and number of cancer cells on the measured impedance was exhibited. In addition, the parameters used to demonstrate the experiment results were optimized. The change of impedance magnitude indicated the cell-matrix interaction during invasion process. The potential further use of this platform would be complementary in cell studies when concerning metastasis.
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Affiliation(s)
- Yitao Liang
- Biosensor National Special Laboratory, Key Laboratory of Biomedical Engineering of the Ministry of Education, College of Biomedical Engineering and Instrument Science, Zhejiang University, Hangzhou, 310027, PR China
| | - Lin Ji
- Key Laboratory of Laparoscopic Technology of Zhejiang Province, Department of General Surgery, Sir Run-Run Shaw Hospital, School of Medicine, Zhejiang University, Hangzhou, 310016, PR China
| | - Tingting Tu
- Biosensor National Special Laboratory, Key Laboratory of Biomedical Engineering of the Ministry of Education, College of Biomedical Engineering and Instrument Science, Zhejiang University, Hangzhou, 310027, PR China
| | - Shanshan Zhang
- Biosensor National Special Laboratory, Key Laboratory of Biomedical Engineering of the Ministry of Education, College of Biomedical Engineering and Instrument Science, Zhejiang University, Hangzhou, 310027, PR China
| | - Bo Liang
- Biosensor National Special Laboratory, Key Laboratory of Biomedical Engineering of the Ministry of Education, College of Biomedical Engineering and Instrument Science, Zhejiang University, Hangzhou, 310027, PR China.
| | - Xuesong Ye
- Biosensor National Special Laboratory, Key Laboratory of Biomedical Engineering of the Ministry of Education, College of Biomedical Engineering and Instrument Science, Zhejiang University, Hangzhou, 310027, PR China.
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Ashton JJ, Peiris D, Green Z, Johnson MJ, Marino LV, Griffiths M, Beattie RM. Routine abdominal magnetic resonance imaging can determine psoas muscle area in paediatric Crohn's disease and correlates with bioelectrical impedance spectroscopy measures of lean mass. Clin Nutr ESPEN 2021; 42:233-238. [PMID: 33745585 DOI: 10.1016/j.clnesp.2021.01.031] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Accepted: 01/25/2021] [Indexed: 12/18/2022]
Abstract
BACKGROUND Paediatric Crohn's disease (CD) has been associated with undernutrition. Accurate and accessible measures of body composition would provide data to personalise nutritional therapy. We assessed feasibility of MRI-derived measures of psoas cross-sectional area (PCSA) in paediatric CD and correlated with anthropometric and bioelectrical impedance spectroscopy (BIS) measures. METHODS MRI small bowel/pelvis images of patients with CD, aged <18 years, were retrieved. Patients with concurrent anthropometric and BIS measurements were eligible for inclusion. The PCSA at L3 was calculated by two assessors and combined. To assess reproducibility of measures we calculated the coefficient of variation (CoV). Age, height-Z-scores, weight-Z-scores and BIS measures were correlated with PCSA. Using normal paediatric data from CT-scans we derived psoas area Z-scores for our cohort. RESULTS 10 patients were included. Mean age at MRI scan was 14.6 years (11.7-16.3). PCSA was calculated for all MRI scans. There was high reproducibility between measurers, mean CoV 0.099. There was a significant positive correlation between PCSA and BIA-derived fat free mass, Pearson correlation coefficient (PCC) 0.831, p = 0.003. Correlation coefficients for PCSA and Height-for-age Z-score, weight-for-age -Z-score and age were PCC 0.343- p = 0.33, PCC = 0.222- p = 0.54, and PCC 0.6034- p = 0.065, respectively. The mean PCSA Z-score was -1.81, with 70% of the patients having a Z-score < -2.0. CONCLUSIONS These data demonstrate the feasibility of deriving measures of body composition from routine MRI imagine. There was significant positive correlation between PCSA and BIS-derived lean mass. Further studies are required to confirm applicability of normal ranges prior to routine clinical implementation.
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Affiliation(s)
- James J Ashton
- Department of Paediatric Gastroenterology, Southampton Children's Hospital, Southampton, UK; Human Genetics and Genomic Medicine, University of Southampton, Southampton, UK
| | - Dilane Peiris
- Department of Paediatric Radiology, Southampton Children's Hospital, Southampton, UK
| | - Zachary Green
- Department of Paediatric Gastroenterology, Southampton Children's Hospital, Southampton, UK
| | - Mark J Johnson
- Department of Neonatal Medicine, Princess Anne Hospital, University Hospital Southampton NHS Foundation Trust, Southampton, UK; National Institute for Health Research, Southampton Biomedical Research Centre, University Hospital Southampton NHS Foundation Trust and University of Southampton, Southampton, UK
| | - Luise V Marino
- Department of Dietetics/SLT, University Hospital Southampton Foundation NHS Trust, Southampton, UK
| | - Mark Griffiths
- Department of Paediatric Radiology, Southampton Children's Hospital, Southampton, UK
| | - R Mark Beattie
- Department of Paediatric Gastroenterology, Southampton Children's Hospital, Southampton, UK.
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Visa A, Plesu N, Maranescu B, Ilia G, Borota A, Crisan L. Combined Experimental and Theoretical Insights into the Corrosion Inhibition Activity on Carbon Steel Iron of Phosphonic Acids. Molecules 2020; 26:E135. [PMID: 33396808 PMCID: PMC7795472 DOI: 10.3390/molecules26010135] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Revised: 12/21/2020] [Accepted: 12/26/2020] [Indexed: 11/18/2022] Open
Abstract
The inhibition effect of N,N'-phosphonomethylglycine (PMG) and vinyl phosphonic acid (VPA) on the 3% NaCl acidic solution corrosion of carbon steel iron was studied at different immersion times by potentiodynamic polarization, electrochemical impedance spectroscopy, attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy, and computational methods. It is found from the polarization studies that PMG and VPA behave as mixed-type inhibitors in NaCl. Values of charge transfer resistance (Rct) and double layer capacitance (Cdl) in the absence and presence of inhibitors are determined. The PMG and VPA inhibitors were capable of inhibiting the corrosion process up to ≈91% and ≈85%, respectively. In the presence of PMG, the synergic effect of chlorine ions was observed. Density functional theory (DFT) was engaged to establish the adsorption site of PMG, VPA, and their deprotonated states. For studied compounds, the resulted values of ELUMO, EHOMO, energy gap (∆E), dipole moment (μ), electronic hardness (η), global softness (σ), electrophilic index (ω), and the electronic potential map are in concordance with the experimental data results regarding their corrosion inhibition behavior and adsorption on the metal surface.
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Affiliation(s)
| | - Nicoleta Plesu
- “Coriolan Dragulescu” Institute of Chemistry, 24 M. Viteazul Ave, 300223 Timişoara, Romania; (A.V.); (B.M.); (G.I.); (A.B.)
| | | | | | | | - Luminita Crisan
- “Coriolan Dragulescu” Institute of Chemistry, 24 M. Viteazul Ave, 300223 Timişoara, Romania; (A.V.); (B.M.); (G.I.); (A.B.)
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Zhen J, Liang G, Chen R, Jia W. Label-free hairpin-like aptamer and EIS-based practical, biostable sensor for acetamiprid detection. PLoS One 2020; 15:e0244297. [PMID: 33362222 PMCID: PMC7757884 DOI: 10.1371/journal.pone.0244297] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2020] [Accepted: 12/08/2020] [Indexed: 12/25/2022] Open
Abstract
Acetamiprid (ACE) is a kind of broad-spectrum pesticide that has potential health risk to human beings. Aptamers (Ap-DNA (1)) have a great potential as analytical tools for pesticide detection. In this work, a label-free electrochemical sensing assay for ACE determination is presented by electrochemical impedance spectroscopy (EIS). And the specific binding model between ACE and Ap-DNA (1) was further investigated for the first time. Circular dichroism (CD) spectroscopy and EIS demonstrated that the single strand AP-DNA (1) first formed a loosely secondary structure in Tris-HClO4 (20 mM, pH = 7.4), and then transformed into a more stable hairpin-like structure when incubated in binding buffer (B-buffer). The formed stem-loop bulge provides the specific capturing sites for ACE, forming ACE/AP-DNA (1) complex, and induced the RCT (charge transfer resistance) increase between the solution-based redox probe [Fe(CN)6]3−/4− and the electrode surface. The change of ΔRCT (charge transfer resistance change, ΔRCT = RCT(after)-RCT(before)) is positively related to the ACE level. As a result, the AP-DNA (1) biosensor showed a high sensitivity with the ACE concentration range spanning from 5 nM to 200 mM and a detection limit of 1 nM. The impedimetric AP-DNA (1) sensor also showed good selectivity to ACE over other selected pesticides and exhbited excellent performance in environmental water and orange juice samples analysis, with spiked recoveries in the range of 85.8% to 93.4% in lake water and 83.7% to 89.4% in orange juice. With good performance characteristics of practicality, sensitivity and selectivity, the AP-DNA (1) sensor holds a promising application for the on-site ACE detection.
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Affiliation(s)
- Jianhui Zhen
- Shijiazhuang Customs Technology Center P.R. China, Shijiazhuang, Hebei Province, China
| | - Gang Liang
- Beijing Research Center for Agricultural Standards and Testing, Beijing Academy of Agriculture and Forestry Science, Beijing, China
- Risk Assessment Lab for Agro-products (Beijing), Ministry of Agriculture, Beijing, China
- Beijing Municipal Key Laboratory of Agriculture Environment Monitoring, Beijing, PR China
- * E-mail:
| | - Ruichun Chen
- Shijiazhuang Customs Technology Center P.R. China, Shijiazhuang, Hebei Province, China
| | - Wenshen Jia
- Beijing Research Center for Agricultural Standards and Testing, Beijing Academy of Agriculture and Forestry Science, Beijing, China
- Risk Assessment Lab for Agro-products (Beijing), Ministry of Agriculture, Beijing, China
- Beijing Municipal Key Laboratory of Agriculture Environment Monitoring, Beijing, PR China
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Sun J, Zhang R, Zhang Y, Liang Q, Zhang F, Xu P, Li G. Evaluation of fish freshness using impedance spectroscopy based on the characteristic parameter of orthogonal direction difference. J Sci Food Agric 2020; 100:4124-4131. [PMID: 32329072 DOI: 10.1002/jsfa.10435] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Revised: 04/15/2020] [Accepted: 04/24/2020] [Indexed: 05/14/2023]
Abstract
BACKGROUND As a nondestructive testing technology, electrochemical impedance spectroscopy (EIS) has been applied to evaluate food quality because of its features of rapidity, low cost, nondestructiveness and portability. However, fish freshness evaluation based on existing EIS technology is affected by the differences of individual biological samples. In this study, the difference of electrical properties between two orthogonal directions was extracted to develop a new freshness indicator. A real part orthogonal direction difference parameter set (RODDS) was used to establish a prediction model for total volatile basic nitrogen (TVB-N). RESULTS Compared with the traditional parameter of EIS, coefficient of determination between RODDS and TVB-N increased from 0.55 to 0.71 for the calibration group, and root mean squared error between predicted and measured values of TVB-N decreased from 5.46 to 3.81 for the test group. CONCLUSIONS The results implied that RODDS could effectively offset individual differences in basic electrical properties and improve the TVB-N prediction accuracy in practical application scenarios with samples from multiple origins. The proposed method may provide a new idea for the development and improvement of EIS-based portable testing devices for fish and meat. © 2020 Society of Chemical Industry.
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Affiliation(s)
- Jian Sun
- School of Electrical and Information Engineering, Jiangsu University, Zhenjiang, China
- School of Information Engineering, Jiangsu Vocational College of Agriculture and Forestry, Zhenjiang, China
| | - Rongbiao Zhang
- School of Electrical and Information Engineering, Jiangsu University, Zhenjiang, China
| | - Yecheng Zhang
- School of Electrical and Information Engineering, Jiangsu University, Zhenjiang, China
| | - Qiufang Liang
- School of Food and Biological Engineering, Jiangsu University, Zhenjiang, China
| | - Fei Zhang
- School of Electrical and Information Engineering, Jiangsu University, Zhenjiang, China
| | - Peifeng Xu
- School of Information Engineering, Jiangsu Vocational College of Agriculture and Forestry, Zhenjiang, China
| | - Guoxiao Li
- School of Electrical and Information Engineering, Jiangsu University, Zhenjiang, China
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Lu L, Liu B, Leng J, Ma X, Peng H. Electrochemical mixed aptamer-antibody sandwich assay for mucin protein 16 detection through hybridization chain reaction amplification. Anal Bioanal Chem 2020; 412:7169-7178. [PMID: 32761361 DOI: 10.1007/s00216-020-02849-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 07/20/2020] [Accepted: 07/27/2020] [Indexed: 01/24/2023]
Abstract
A mixed aptamer-antibody sandwich assay for the determination of mucin protein 16 (MUC16) was developed based on hybridization chain reaction (HCR) with methylene blue (MB) as an electrochemical indicator. First, MUC16 antibody was adsorbed onto the surface of the Au nanoparticle (AuNP)-modified indium tin oxide (ITO) electrode to effectively capture the target MUC16. After MUC16 was captured by the MUC16 aptamer, an antibody/MUC16/aptamer sandwich structure formed for the highly selective detection of MUC16. The 3' end of the aptamer was then subjected to HCR with the assistance of auxiliary probes to obtain DNA concatemers. Numerous MB molecules bonded with G bases in the DNA concatemers by immersing the modified ITO electrode into a stirred solution containing MB with KCl. Stepwise changes in the microscopic features of the electrode surface were studied by scanning electron microscopy (SEM). Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were used to characterize the electrochemical behavior of the different modified electrodes. The oxidation current of MB was detected by differential pulse voltammetry (DPV). Under the optimum conditions, the proposed mixed aptamer-antibody sandwich assay showed wide dynamic range from 0.39 to 200 unit mL-1 with a low detection limit of 0.02 unit mL-1 (S/N ratio = 3). The proposed method showed good accuracy, selectivity, and acceptable reproducibility. Graphical abstract An electrochemical mixed aptamer-antibody sandwich assay based on the aptamer-induced HCR amplification strategy was fabricated for the highly sensitive detection of MUC16. The mixed aptamer-antibody sandwich assay showed acceptable performance of detection range, detection limit, reproducibility, and selectivity.
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Affiliation(s)
- Lingsong Lu
- Department of Central Laboratory, Affiliated Hangzhou First People's Hospital, Zhejiang University School of Medicine, Hangzhou, 310006, Zhejiang, China.
| | - Bei Liu
- Department of Reproductive Genetics, Women's Hospital, Zhejiang University School of Medicine, Hangzhou, 310006, Zhejiang, China
| | - Jianhang Leng
- Department of Central Laboratory, Affiliated Hangzhou First People's Hospital, Zhejiang University School of Medicine, Hangzhou, 310006, Zhejiang, China
| | - Xiao Ma
- Department of Central Laboratory, Affiliated Hangzhou First People's Hospital, Zhejiang University School of Medicine, Hangzhou, 310006, Zhejiang, China
| | - Huihui Peng
- Department of Central Laboratory, Affiliated Hangzhou First People's Hospital, Zhejiang University School of Medicine, Hangzhou, 310006, Zhejiang, China
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Ghazizadeh E, Moosavifard SE, Daneshmand N, Kaverlavani SK. Impediometric Electrochemical Sensor Based on The Inspiration of Carnation Italian Ringspot Virus Structure to Detect an Attommolar of miR. Sci Rep 2020; 10:9645. [PMID: 32541792 PMCID: PMC7295965 DOI: 10.1038/s41598-020-66393-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Accepted: 05/19/2020] [Indexed: 01/17/2023] Open
Abstract
Electrochemical sensors are the tools to detect the accurate and sensitive miRs. There is the challenge to increase the power and sensitivity of the surface for the electrochemical sensor. We design a virus-like hallow structure of cuco2o4 that it holds the large amounts of p19 protein by mimicking of inherent virus (Carnation italian ringspot virus) to detect 21mir with the limit of detection (LOD = 1aM). The electrochemical measurements are performed between the potentials at -0.3 V and +0.3 V with 1 mM [Fe(CN)6] -3/-4. After dropping the cuco2o4 on the SCPE (screen carbon printed electrode), the sensor is turned on due to the high electrochemical properties. Then, p19 proteins move into the hallow structure and inhibit the exchange of electrochemical reactions between the shells and the sensor is turned off. Then, adding the duplexes of RNA/miRs cause to increase the electrochemical property of p19 due to the change of p19 conformation and the system is turned on, again. So, for the first time, a virus-like hallow structure has been used to detect the 21miR in the human serum, MCF-7, Hella cells, with high sensitivity, specificity, and reproducibility in few minutes.
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Affiliation(s)
- E Ghazizadeh
- Department of Medical Biotechnology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.
| | - Seyyed Ebrahim Moosavifard
- Department of Advanced Medical Sciences & Technologies, School of Medicine, Jahrom University of Medical Sciences, Jahrom, 74148-46199, Iran.
- Research Center for Noncommunicable Diseases, School of Medicine, Jahrom University of Medical Sciences, Jahrom, 74148-46199, Iran.
| | - Negin Daneshmand
- Department of Materials Science and Engineering, Shiraz university, Shiraz, Iran
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Li P, Zhang M, Sun C, Wang D, Xu W, Zou Y, Ma J, Zhu Y. A novel photoelectrochemical sensor based on tailoring printable mesoscopic chip for fast and real-time phospholipids oxidation detection. Food Chem 2020; 314:126173. [PMID: 31954942 DOI: 10.1016/j.foodchem.2020.126173] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Revised: 12/13/2019] [Accepted: 01/07/2020] [Indexed: 12/19/2022]
Abstract
The detection of phospholipids oxidation is important for meat control and disease prevention. In this paper, a photoelectrochemical sensor based on printable mesoscopic chip (PMC) for fast and real-time monitoring phospholipids oxidation was designed and fabricated. TiO2, ZrO2 and carbon films of PMC were screen-printed onto the FTO glass layer by layer. The PMC and the feasibility for determination of phospholipids oxidation were investigated by scanning electron microscope (SEM), UV-vis spectroscopy, cyclic voltammograms (CVs) and electrochemical impedance spectroscopy (EIS), etc. The short circuit current (Jsc) was used as a signal current, which would decrease if phospholipids in PMC were undergoing oxidation for the change of electrical properties. Compared with other methods, phospholipids in PMC did not require pretreatment, and the process was nondestructive and real-time. Meanwhile, this method showed high sensitivity and good selectivity. The fabricating process of PMC is simple, and the costs are low, relatively.
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Affiliation(s)
- Pei Li
- Institute of Agricultural Products Processing, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; College of Food Science and Engineering, Yangzhou University, Yangzhou 225127, China
| | - Muhan Zhang
- Institute of Agricultural Products Processing, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
| | - Chong Sun
- Institute of Agricultural Products Processing, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China.
| | - Daoying Wang
- Institute of Agricultural Products Processing, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; Qinghai Province Qinghai Lake Meat Industry Co., Ltd, Hainan 813099, China.
| | - Weimin Xu
- Institute of Agricultural Products Processing, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China; Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control, Nanjing 210095, China
| | - Ye Zou
- Institute of Agricultural Products Processing, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
| | - Jingjing Ma
- Institute of Agricultural Products Processing, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
| | - Yongzhi Zhu
- Institute of Agricultural Products Processing, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
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Hernandez-Cardoso GG, Singh AK, Castro-Camus E. Empirical comparison between effective medium theory models for the dielectric response of biological tissue at terahertz frequencies. Appl Opt 2020; 59:D6-D11. [PMID: 32400617 DOI: 10.1364/ao.382383] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Accepted: 12/06/2019] [Indexed: 06/11/2023]
Abstract
We study the use of three effective medium theory models, namely Maxwell-Garnett, Bruggeman, and Landau-Lifshitz-Looyenga, for the dielectric response of biological tissue in the terahertz band of the electromagnetic spectrum. In order to accomplish our objectives, we performed measurements on water-dehydrated basil binary mixtures encompassing the entire concentration range, and we further analyze the dielectric function with the models. Our results indicate that the Landau-Lifshitz-Looyenga and Bruggeman models provide marginally better fit to the experimentally measured dielectric function in the terahertz band. We further discuss the biological relevance of the models in the context of our experimental data based on their fundamental assumptions.
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42
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Lu Q, Liu X, Hou J, Yuan Q, Li Y, Chen S. Selection of Aptamers Specific for DEHP Based on ssDNA Library Immobilized SELEX and Development of Electrochemical Impedance Spectroscopy Aptasensor. Molecules 2020; 25:molecules25030747. [PMID: 32050451 PMCID: PMC7038136 DOI: 10.3390/molecules25030747] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2019] [Revised: 01/23/2020] [Accepted: 01/25/2020] [Indexed: 12/20/2022] Open
Abstract
A selection of aptamers specific for di(2-ethylhexyl) phthalate (DEHP) and development of electrochemical impedance spectroscopy (EIS) aptasensor are described in this paper. The aptamers were selected from an immobilized ssDNA library using the systematic evolution of ligands by exponential enrichment (SELEX). The enrichment was monitored using real-time quantitative PCR (Q-PCR), and the aptamers were identified by high-throughput sequencing (HTS), gold nanoparticles (AuNPs) colorimetric assay, and localized surface plasmon resonance (LSPR). The EIS aptasensor was developed to detect DEHP in water samples. After eight rounds of enrichment, HTS, AuNPs colorimetric assay, and LSPR analysis indicated that four aptamers had higher binding activity, and aptamer 31 had the highest affinity (Kd = 2.26 ± 0.06 nM). The EIS aptasensor had a limit of detection (LOD) of 0.103 pg/mL with no cross-reactivity to DEHP analogs and a mean recovery of 76.07% to 141.32% for detection of DEHP in water samples. This aptamer is novel with the highest affinity and sensitivity.
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Affiliation(s)
- Qi Lu
- Hubei Key Laboratory of Edible Wild Plants Conservation and Utilization, College of Life Sciences, Hubei Normal University, Huangshi 435002, China; (Q.L.); (Q.Y.); (Y.L.); (S.C.)
| | - Xixia Liu
- Hubei Key Laboratory of Edible Wild Plants Conservation and Utilization, College of Life Sciences, Hubei Normal University, Huangshi 435002, China; (Q.L.); (Q.Y.); (Y.L.); (S.C.)
- Hubei Engineering Research Center of typical wild vegetable Breeding and Comprehensive Utilization Technology; Hubei Normal University, Huangshi 435002, China
- National Demonstration Center for Experimental Biology Education, Hubei Normal University, Huangshi 435002, China
- Correspondence: (X.L.); (J.H.)
| | - Jianjun Hou
- Hubei Key Laboratory of Edible Wild Plants Conservation and Utilization, College of Life Sciences, Hubei Normal University, Huangshi 435002, China; (Q.L.); (Q.Y.); (Y.L.); (S.C.)
- Hubei Engineering Research Center of typical wild vegetable Breeding and Comprehensive Utilization Technology; Hubei Normal University, Huangshi 435002, China
- National Demonstration Center for Experimental Biology Education, Hubei Normal University, Huangshi 435002, China
- Correspondence: (X.L.); (J.H.)
| | - Qiuxue Yuan
- National Demonstration Center for Experimental Biology Education, Hubei Normal University, Huangshi 435002, China
| | - Yani Li
- Hubei Key Laboratory of Edible Wild Plants Conservation and Utilization, College of Life Sciences, Hubei Normal University, Huangshi 435002, China; (Q.L.); (Q.Y.); (Y.L.); (S.C.)
| | - Sirui Chen
- Hubei Key Laboratory of Edible Wild Plants Conservation and Utilization, College of Life Sciences, Hubei Normal University, Huangshi 435002, China; (Q.L.); (Q.Y.); (Y.L.); (S.C.)
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Bourgeat L, Serghei A, Lesieur C. Experimental Protein Molecular Dynamics: Broadband Dielectric Spectroscopy coupled with nanoconfinement. Sci Rep 2019; 9:17988. [PMID: 31784681 PMCID: PMC6884508 DOI: 10.1038/s41598-019-54562-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Accepted: 11/05/2019] [Indexed: 11/09/2022] Open
Abstract
Protein dynamics covers multiple spatiotemporal scale processes, among which slow motions, not much understood even though they are underlying protein folding and protein functions. Protein slow motions are associated with structural heterogeneity, short-lived and poorly populated conformations, hard to detect individually. In addition, they involve collective motions of many atoms, not easily tracked by simulation and experimental devices. Here we propose a biophysical approach, coupling geometrical nanoconfinement and broadband dielectric spectroscopy (BDS), which distinguishes protein conformations by their respective molecular dynamics. In particular, protein-unfolding intermediates, usually poorly populated in macroscopic solutions are detected. The protein dynamics is observed under unusual conditions (sample nanoconfinement and dehydration) highlighting the robustness of protein structure and protein dynamics to a variety of conditions consistent with protein sustainability. The protein dielectric signals evolve with the temperature of thermal treatments indicating sensitivity to atomic and molecular interaction changes triggered by the protein thermal unfolding. As dipole fluctuations depend on both collective large-scale motions and local motions, the approach offers a prospect to track in-depth unfolding events.
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Affiliation(s)
- Laëtitia Bourgeat
- AMPERE, CNRS, Univ. Lyon, 69622, Lyon, France
- IMP, CNRS, Univ. Lyon, 69622, Lyon, France
| | | | - Claire Lesieur
- AMPERE, CNRS, Univ. Lyon, 69622, Lyon, France.
- Institut Rhônalpin des systèmes complexes, IXXI-ENS-Lyon, 69007, Lyon, France.
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Jahangiri-Dehaghani F, Zare HR, Shekari Z. Measurement of aflatoxin M1 in powder and pasteurized milk samples by using a label-free electrochemical aptasensor based on platinum nanoparticles loaded on Fe-based metal-organic frameworks. Food Chem 2019; 310:125820. [PMID: 31810725 DOI: 10.1016/j.foodchem.2019.125820] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Revised: 10/25/2019] [Accepted: 10/28/2019] [Indexed: 11/16/2022]
Abstract
In the present study, a sensitive label-free electrochemical aptasensor is introduced to measure aflatoxin M1 (AFM1) by using platinum nanoparticles (PtNPs) decorated on a glassy carbon electrode (GCE) modified with Fe-based metal-organic frameworks, MIL-101(Fe). The MIL-101(Fe) and the PtNP/MIL-101(Fe) are synthesized and characterized by Fourier transform infrared spectroscopy, X-ray diffraction, UV-Visible spectroscopy, and field-emission scanning electron microscopy. Cyclic voltammetry and electrochemical impedance spectroscopy (EIS) are done to monitor the fabrication processes of the aptasensor. In optimum conditions, the linear calibration range of 1.0 × 10-2 to 80.0 ng mL-1 and the detection limit of 2.0 × 10-3 ng mL-1 are obtained to measure AFM1 concentration using the EIS method. Finally, the fabricated aptasensor is successfully applied to measure AFM1 concentration in powder and pasteurized milk samples.
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Affiliation(s)
| | - Hamid R Zare
- Department of Chemistry, Faculty of Science, Yazd University, Yazd 89195-741, Iran.
| | - Zahra Shekari
- Department of Chemistry, Faculty of Science, Yazd University, Yazd 89195-741, Iran
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45
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Manjula V, Prasad TV, Balakrishna K, Murthy VRK, Vishwam T. Relaxation dynamics of l-alanine in water medium investigated by dielectric relaxation spectroscopy. Spectrochim Acta A Mol Biomol Spectrosc 2019; 222:117274. [PMID: 31229918 DOI: 10.1016/j.saa.2019.117274] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2019] [Revised: 06/09/2019] [Accepted: 06/13/2019] [Indexed: 06/09/2023]
Abstract
The complex dielectric permittivity of L-alanine in aqueous medium at different concentrations and different temperatures were measured in the microwave (0.02 < ν/GHz < 20) frequency region by using open-ended coaxial probe technique. From the reflection coefficient and impedance data, the real and imaginary part of the dielectric permittivity values is determined. It is observed that there is a decrease in the real part of the dielectric permittivity up to certain frequency and an increase in the imaginary part of the dielectric permittivity with increase in the molar concentration of L-alanine in water medium. Based on the experimental data the average relaxation time values are calculated and its behavior is analyzed in terms of bound water and free water molecules. The theoretical dipole moment of L-alanine is calculated at gaseous state as well as in aqueous medium by using PCM and IEFPCM model at HF, DFT/B3LYP and MP2 calculations using 6-311G* basis set. Analysis between experimentally determined parameters and computed dipole moments were discussed. The mean molecular polarizability is calculated from the Lippincott δ function potential model and compared with the Le Fèvre method of polarizability values.
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Affiliation(s)
- V Manjula
- Department of Physics, GITAM (Deemed to be University)-Hyderabad, Rudraram, Patancheru (M), TS 502329, India; Department of Physics, Geethanjali College of Engineering and Technology, Hyderabad, Telangana 501301, India
| | - T Vamshi Prasad
- Department of Physics, Jawaharlal Nehru Technological University-Hyderabad, Hyderabad 500085, India
| | - K Balakrishna
- Department of Physics, GITAM (Deemed to be University)-Hyderabad, Rudraram, Patancheru (M), TS 502329, India
| | - V R K Murthy
- Microwave Laboratory, Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India
| | - T Vishwam
- Department of Physics, GITAM (Deemed to be University)-Hyderabad, Rudraram, Patancheru (M), TS 502329, India.
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46
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Kombolias M, Obrzut J, Postek MT, Poster DL, Obeng YS. Method Development for Contactless Resonant Cavity Dielectric Spectroscopic Studies of Cellulosic Paper. J Vis Exp 2019:10.3791/59991. [PMID: 31633693 PMCID: PMC7937941 DOI: 10.3791/59991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
The current analytical techniques for characterizing printing and graphic arts substrates are largely ex situ and destructive. This limits the amount of data that can be obtained from an individual sample and renders it difficult to produce statistically relevant data for unique and rare materials. Resonant cavity dielectric spectroscopy is a non-destructive, contactless technique which can simultaneously interrogate both sides of a sheeted material and provide measurements which are suitable for statistical interpretations. This offers analysts the ability to quickly discriminate between sheeted materials based on composition and storage history. In this methodology article, we demonstrate how contactless resonant cavity dielectric spectroscopy may be used to differentiate between paper analytes of varying fiber species compositions, to determine the relative age of the paper, and to detect and quantify the amount of post-consumer waste (PCW) recycled fiber content in manufactured office paper.
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Affiliation(s)
- Mary Kombolias
- Testing and Technical Services, Plant Operations, United States Government Publishing Office;
| | - Jan Obrzut
- Materials Measurement Laboratory, National Institute of Standards and Technology
| | - Michael T Postek
- Nanoscale Device Characterization Division, Physical Measurement Laboratory, National Institute of Standards and Technology; College of Pharmacy, University of South Florida
| | - Dianne L Poster
- Materials Measurement Laboratory, National Institute of Standards and Technology
| | - Yaw S Obeng
- Nanoscale Device Characterization Division, Physical Measurement Laboratory, National Institute of Standards and Technology;
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47
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Waree K, Pangza K, Jangsawang N, Thongbai P, Buranurak S. DIELECTRIC PROPERTIES OF POLY (VINYLIDENE FLUORIDE)/BARIUM TITANATE NANOCOMPOSITES UNDER GAMMA IRRADIATION. Radiat Prot Dosimetry 2019; 184:342-346. [PMID: 31038703 DOI: 10.1093/rpd/ncz111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The main focus of this study is to investigate the effect of gamma irradiation on the electrical properties of PVDF/BT nanocomposites. A 1.25 MeV gamma-ray was delivered to the composite films with different BaTiO3-volume fraction, ƒBT = 0-0.4, and with different absorbed doses ranged 50-2500 Gy. Dielectric properties of PVDF/BaTiO3 composites under frequencies ranged from 100 Hz to 10 MHz at room temperature were investigated using an impedance analyser. An increase of 28% in the dielectric constant and a decrease of 15% in the loss tangent were observed in the PVDF/BT 40 vol% nanocomposite film under the accumulated dose of 1500 Gy. Scanning electron microscopy provided no significant difference in microscopic structures between non-exposed and gamma-exposed materials. Fourier-transform infra-red spectroscopy provides gamma-induced transition of PVDF-crystalline forms as alpha-PVDF into beta-PVDF/gamma-PVDF which has been reported as one of the main factors affected the change of dielectric constant in polymers. UV-visible spectrophotometry has been observed gamma-induced red shift in the absorption edge of the PVDF/BT 40 vol% nanocomposite film from 400 nm to 420 nm under the accumulated dose of 1500 Gy. However, a blue shift is observed with increase the accumulated dose up to 2000 Gy.
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Affiliation(s)
- K Waree
- Department of Physics, Faculty of science, Khon Kaen University, Khon Kaen, Thailand
| | - K Pangza
- Gems Irradiation Center, Thailand Institute of Nuclear Technology, Nakhon Nayok, Thailand
| | - N Jangsawang
- Gems Irradiation Center, Thailand Institute of Nuclear Technology, Nakhon Nayok, Thailand
| | - P Thongbai
- Department of Physics, Faculty of science, Khon Kaen University, Khon Kaen, Thailand
| | - S Buranurak
- Department of Physics, Faculty of science, Khon Kaen University, Khon Kaen, Thailand
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48
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Feng S, Li Y, Zhang R, Li Y. A novel electrochemical sensor based on molecularly imprinted polymer modified hollow N, S-Mo 2C/C spheres for highly sensitive and selective carbendazim determination. Biosens Bioelectron 2019; 142:111491. [PMID: 31326864 DOI: 10.1016/j.bios.2019.111491] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Revised: 06/09/2019] [Accepted: 07/01/2019] [Indexed: 02/07/2023]
Abstract
A novel electrochemical sensor based on nitrogen and sulfur doped hollow Mo2C/C spheres (N, S-Mo2C) and molecularly imprinted polymer (MIP) was proposed for carbendazim (CBD) determination. The N, S-Mo2C were prepared by first nitrogen and sulfur doping via one-pot method and subsequent carbonization at high temperature. A film of MIP was then fabricated in situ on the N, S-Mo2C surface by electropolymerization, with CBD acting as template molecule and o-phenylenediamine as functional monomer. The N, S-Mo2C were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive spectroscopy (EDS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and electrochemical behaviors of CBD on differently modified electrodes were explored by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Under the optimal conditions, a calibration curve of current shift versus the logarithm of CBD concentration was obtained in the range of 1×10-12 ∼ 8×10-9 M with a detection limit of 6.7×10-13 M (S/N=3). Moreover, the proposed sensor exhibited favorable stability and selectivity, and was applied to analyze pesticide residues in fruits and vegetables with decent accuracy.
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Affiliation(s)
- Shuxiao Feng
- College of Chemical Engineering & Pharmaceutical, Henan University of Science and Technology, Luoyang, 471023, China
| | - Yangguang Li
- Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Shihezi, China
| | - Ruyue Zhang
- Key Laboratory of Xinjiang Phytomedicine Resource and Utilization, Ministry of Education, School of Pharmacy, Shihezi University, Shihezi, 832000, China
| | - Yingchun Li
- College of Science, Harbin Institute of Technology, Shenzhen, 518055, China.
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49
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Taki M, Rohilla KJ, Barton M, Funneman M, Benzabeh N, Naphade S, Ellerby LM, Gagnon KT, Shamsi MH. Novel probes for label-free detection of neurodegenerative GGGGCC repeats associated with amyotrophic lateral sclerosis. Anal Bioanal Chem 2019; 411:6995-7003. [PMID: 31435686 PMCID: PMC7433021 DOI: 10.1007/s00216-019-02075-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Revised: 07/18/2019] [Accepted: 08/06/2019] [Indexed: 01/28/2023]
Abstract
DNA repeat expansion sequences cause a myriad of neurological diseases when they expand beyond a critical threshold. Previous electrochemical approaches focused on the detection of trinucleotide repeats (CAG, CGG, and GAA) and relied on labeling of the probe and/or target strands or enzyme-linked assays. However, detection of expanded GC-rich sequences is challenging because they are prone to forming secondary structures such as cruciforms and quadruplexes. Here, we present label-free detection of hexanucleotide GGGGCC repeat sequences, which cause the leading genetic form of frontotemporal dementia (FTD) and amyotrophic lateral sclerosis (ALS). The approach relies on capturing targets by surface-bound oligonucleotide probes with a different number of complementary repeats, which proportionately translates the length of the target strands into charge transfer resistance (RCT) signal measured by electrochemical impedance spectroscopy. The probe carrying three tandem repeats transduces the number of repeats into RCT with a 3× higher calibration sensitivity and detection limit. Chronocoulometric measurements show a decrease in surface density with increasing repeat length, which is opposite of the impedance trend. This implies that the length of the target itself can contribute to amplification of the impedance signal independent of the surface density. Moreover, the probe can distinguish between a control and patient sequences while remaining insensitive to non-specific Huntington's disease (CAG) repeats in the presence of a complementary target. This label-free strategy might be applied to detect the length of other neurodegenerative repeat sequences using short probes with a few complementary repeats. Graphical abstract Short oligomeric probes with multiple complementary repeats detect long neurodegenerative targets with high sensitivity and transduce into higher impedance signal.
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Affiliation(s)
- Motahareh Taki
- Department of Chemistry & Biochemistry, Southern Illinois University, 1245 Lincoln Dr, Carbondale, IL, 62901, USA
| | - Kushal J Rohilla
- Biochemistry and Molecular Biology, Southern Illinois University School of Medicine, Carbondale, IL, 62901, USA
| | - Maria Barton
- Biochemistry and Molecular Biology, Southern Illinois University School of Medicine, Carbondale, IL, 62901, USA
| | - Madison Funneman
- Department of Chemistry & Biochemistry, Southern Illinois University, 1245 Lincoln Dr, Carbondale, IL, 62901, USA
| | - Najiyah Benzabeh
- Department of Chemistry & Biochemistry, Southern Illinois University, 1245 Lincoln Dr, Carbondale, IL, 62901, USA
| | - Swati Naphade
- The Buck Institute for Research on Aging, 8001 Redwood Blvd, Novato, CA, 94945, USA
| | - Lisa M Ellerby
- The Buck Institute for Research on Aging, 8001 Redwood Blvd, Novato, CA, 94945, USA
| | - Keith T Gagnon
- Department of Chemistry & Biochemistry, Southern Illinois University, 1245 Lincoln Dr, Carbondale, IL, 62901, USA
- Biochemistry and Molecular Biology, Southern Illinois University School of Medicine, Carbondale, IL, 62901, USA
| | - Mohtashim H Shamsi
- Department of Chemistry & Biochemistry, Southern Illinois University, 1245 Lincoln Dr, Carbondale, IL, 62901, USA.
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Soulier F, Lamlih A, Kerzérho V, Bernard S, Rouyer T. Very Low Resource Digital Implementation of Bioimpedance Analysis. Sensors (Basel) 2019; 19:s19153381. [PMID: 31374915 PMCID: PMC6696154 DOI: 10.3390/s19153381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Revised: 07/17/2019] [Accepted: 07/28/2019] [Indexed: 06/10/2023]
Abstract
Bioimpedance spectroscopy consists of measuring the complex impedance of biological tissues over a large frequency domain. This method is particularly convenient for physiological studies or health monitoring systems. For a wide range of applications, devices need to be portable, wearable or even implantable. Next generation of bioimpedance sensing systems thus require to be implemented with power and resource savings in mind. Impedance measurement methods are divided into two main categories. Some are based on "single-tone" signals while the others use "multi-tone" signals. The firsts benefit from a very simple analysis that may consist of synchronous demodulation. However, due to necessary frequency sweep, the total measurement may take a long time. On the other hand, generating a multi-frequency signal allows the seconds to cover the whole frequency range simultaneously. This is at the cost of a more complex analysis algorithm. This makes both approaches hardly suitable for embedded applications. In this paper, we propose an intermediate approach that combines the speed of multi-tone systems with a low-resource analysis algorithm. This results in a minimal implementation using only adders and synchronous adc. For optimal performances, this small footprint digital processing can be synthesized and embedded on a mixed-mode integrated circuit together with the analog front-end. Moreover, the proposed implementation is easily scalable to fit an arbitrary frequency range. We also show that the resulting impact on noise sensitivity can be mitigated.
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Affiliation(s)
- Fabien Soulier
- LIRMM, CNRS, University Montpellier, 34095 Montpellier, France.
| | - Achraf Lamlih
- LIRMM, CNRS, University Montpellier, 34095 Montpellier, France
| | | | - Serge Bernard
- LIRMM, CNRS, University Montpellier, 34095 Montpellier, France
| | - Tristan Rouyer
- MARBEC, Ifremer, University Montpellier, 34203 Sète, France
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