MIP-Based Electrochemical Sensor for SARS-CoV-2 Antigen Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current diagnostic tools for SARS-CoV-2 detection, such as RT-PCR and ELISA, are costly, require skilled personnel, have long turnaround times, and are prone to false-negative results, with a need for cheaper, portable biosensing devices that do not rely on biological recognition elements.
Innovation Solution
Development of a portable electrochemical sensor integrated with molecularly imprinted polymers (MIPs) that selectively detect SARS-CoV-2 antigens, specifically nucleocapsid protein (ncovNP) and spike protein (ncovS1), using a protein-surface imprinting approach with controllable electropolymerization for depositing polymer layers on the sensor transducer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If RT-PCR tests are used for SARS-CoV-2 detection, then detection accuracy is improved, but device complexity and cost increase, and turnaround time increases
Solution Approach 1:
The patent replaces complex mechanical/chemical PCR amplification systems with a simpler electrochemical detection system using MIP sensors. The MIP-based electrochemical sensor directly detects SARS-CoV-2 antigens without requiring PCR amplification, thereby reducing device complexity while maintaining detection accuracy through the highly selective molecularly imprinted polymer recognition sites.
2Measurement precision
If RT-PCR tests are used for SARS-CoV-2 detection, then detection accuracy is improved, but analysis time increases
Solution Approach 1:
The patent skips the time-consuming PCR amplification steps and goes directly to antigen detection using MIP electrochemical sensors. This allows rapid detection of SARS-CoV-2 antigens in clinical samples without the multi-hour PCR process, significantly reducing turnaround time while maintaining diagnostic accuracy through the high selectivity of the MIP recognition elements.
3Reliability
If biological recognition elements are used in diagnostic tools, then selectivity is improved, but shelf life decreases and cost increases
Solution Approach 1:
The patent replaces expensive, short-shelf-life biological recognition elements (antibodies) with stable, synthetic molecularly imprinted polymer recognition sites. The MIPs are chemically synthesized materials that exhibit excellent chemical and thermal stability, significantly extending the shelf life of the diagnostic device while maintaining high selectivity for SARS-CoV-2 antigens through the template-imprinted binding sites.
4Reliability
If biological recognition elements are used in diagnostic tools, then selectivity is improved, but cost increases
Solution Approach 1:
The patent substitutes costly biological antibodies with inexpensive synthetic MIP materials that can be manufactured through standard electrochemical polymerization processes. The MIPs are produced by polymerizing functional monomers around antigen templates, creating cost-effective recognition elements that eliminate the need for expensive antibody production, purification, and validation processes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The MIP-based sensors achieve detection limits of 15-70 fM, with a shelf life of over 5 weeks, and can discriminate between SARS-CoV-2 antigens and interfering proteins, providing accurate and reliable detection from various sample types, including clinical and environmental samples.
Implementation Method 1
Molecular imprinting can be defined as a process of template-induced formation of specific molecular recognition sites in a polymer material. In this process, a mixture of functional monomers is polymerized around a chosen target acting as a template. Subsequent removal of the templates from the formed polymer leaves behind binding sites that are complementary to the target molecule in size, shape arrangement of functional groups and capable of selectively recognizing these molecules.
Implementation Method 2
the current sensors provided here use protein-surface imprinting approach coupled with more controllable electropolymerization method to deposit polymer directly on the sensor transducer
Data Source
AI summary
The current COVID-19 pandemic caused by SARS-CoV-2 coronavirus is expanding around the globe. Hence, accurate and cheap portable sensors are crucially important for the clinical diagnosis of COVID-19. Molecularly imprinted polymers (MIPs) as robust synthetic molecular recognition materials with antibody-like ability to bind and discriminate between molecules are provided here as selective elements in such sensors. Provided are detection assemblies comprising electrochemical sensors having ncovNP-MIP film endowed selectivity against SARS-CoV-2 nucleoprotein (ncovNP) and/or ncovS1-MIP film endowed selectivity against SARS-CoV-2 spike 1 (S1). The ncovNP- or ncovS1-MIP are synthesized electrochemically on portable gold thin-film electrodes system via chronocoulometry or cyclic voltammetry. The sensors show excellent detection capabilities, and high discrimination of interfering proteins.