A portable, low-cost and high-throughput electrochemical impedance spectroscopy device for point-of-care biomarker detection
Biosensors and Bioelectronics: X
; 13, 2023.
Article
in English
| Scopus | ID: covidwho-2246569
ABSTRACT
This paper presents a portable, fast and accurate electrochemical impedance spectroscopy (EIS) device with 8-well interdigitated electrode chips for biomarker detection. The design adopts low crest factor multisine signal synthesis at low frequencies (<1 kHz) and single-tone signals at high frequencies (>1 kHz), which significantly increases measurement speed without sacrificing accuracy. In addition, the low excitation amplitude of 10 mV preserves impedance linearity and protects the biosamples. The system achieved an average magnitude accuracy error of 0.30% in the frequency range of interest and it requires only 0.46 s to scan 28 frequency points from 10 Hz to 1 MHz. Experiments were conducted to test the capability to detect antibodies against SARS-CoV-2. Gold nanoparticles bound with protein G (GNP-G) were employed as the conjugated secondary antibody probe to detect anti-SARS-CoV-2 IgG in serum. A highly statistical significance (p = 7×10−6) could be found in the impedance data at 10 kHz. The impedance magnitude alteration caused by the GNP-G of the positive and negative groups were 27.2%±13.6% and 4.1%±1.7%, respectively. The results imply that the proposed system enables rapid COVID-19 antibody biomarker detection. Moreover, the EIS system and GNPs have the potential to be modified to detect other biomarkers. © 2022 The Author(s)
Antibodies; Biomarkers; Chemical detection; Coronavirus; Costs; Electrochemical biosensors; Electrochemical electrodes; Electrochemical impedance spectroscopy; Fiber optic sensors; Metal nanoparticles; gold nanoparticle; immunoglobulin G antibody; protein G; SARS-CoV-2 antibody; Covid-19 detection; Electrochemical-impedance spectroscopies; Gold Nanoparticles; Inter-digitated electrodes; Interdigitated electrode chip; Interdigitated electrodes; Low-high; Point of care; Article; coronavirus disease 2019; frequency; impedance spectroscopy; measurement accuracy; measurement error; point of care testing; Interdigitated electrodes chip; Point-of-care
Full text:
Available
Collection:
Databases of international organizations
Database:
Scopus
Language:
English
Journal:
Biosensors and Bioelectronics: X
Year:
2023
Document Type:
Article
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