Antimicrobial Peptide Biosensor for Pathogen Detection
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Solution Overview
Problem
Current methods for detecting pathogenic bacteria are limited by the instability of antibody-based sensors, the need for nucleic acid extraction in PCR, and the lack of portability and sensitivity in existing biosensors, making it challenging to develop a robust, sensitive, and selective detection system for a broad spectrum of pathogenic species.
Innovation Solution
A biosensor utilizing immobilized antimicrobial peptides (AMPs) on a graphene substrate with an interdigitated microelectrode array, coupled with impedance spectroscopy for real-time detection, allowing for wireless monitoring and operation on various power sources, including battery-free options, to detect a wide range of pathogens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If antibody-based sensors are used for detection, then specificity can be achieved, but stability deteriorates due to protein degradation and immunogenicity
Solution Approach 1:
The patent employs synthetic DNA oligonucleotides as detection probes instead of stable but immunogenic antibodies. These short-lived molecular probes are designed to be disposable, providing specificity without the stability issues of protein-based sensors. The DNA probes can be easily synthesized, are non-immunogenic, and maintain their binding specificity without degradation.
Solution Approach 2:
The patent changes the fundamental parameter of the recognition molecule from protein (antibody) to nucleic acid (DNA oligonucleotide). This parameter change transforms the sensor from a protein-based system prone to degradation and immunogenicity to a nucleic acid-based system with superior stability and no immunogenicity, while maintaining detection specificity through complementary base pairing.
2Measurement precision
If PCR methods are used for detection, then sensitivity can be achieved, but complexity increases due to nucleic acid extraction requirements
Solution Approach 1:
The patent extracts and removes the complex nucleic acid extraction step from the detection process. By using DNA oligonucleotide probes that can directly hybridize to target sequences in the presence of cells or tissues, the method eliminates the need for separate extraction, amplification, and purification steps required by PCR, thereby reducing complexity while maintaining sensitivity.
Solution Approach 2:
The patent replaces the mechanical and chemical extraction process of PCR with a direct hybridization-based detection method. Instead of requiring physical extraction of nucleic acids followed by thermal cycling and enzymatic amplification, the system uses complementary DNA probes that bind directly to target sequences, substituting a simpler biochemical process for a complex mechanical one.
3Measurement precision
If traditional biosensors are used, then detection capability is provided, but portability deteriorates due to size and power requirements
Solution Approach 1:
The patent segments the biosensor into a miniaturized format with integrated components. The sensor chip includes separately formed anode and cathode electrodes, DNA probe regions, and signal processing elements all integrated on a single small substrate. This segmentation allows the entire detection system to be compact and portable while maintaining full detection capability.
Solution Approach 2:
The patent implements self-powered detection through the integration of electrodes and signal processing elements that can operate without external power sources. The sensor design allows for autonomous detection and signal processing, eliminating the need for external power supplies and enhancing portability.
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 biosensor achieves high sensitivity, selectivity, and portability, capable of detecting as few as one infectious unit in real-time, suitable for various environments and surfaces, including biological tissues, with improved stability and versatility compared to traditional methods.
Implementation Method 1
The sensing component has an electrical conductivity that changes in response to binding of the immobilized peptide to the target
Implementation Method 2
The immobilized peptide may comprise an antimicrobial peptide binding motif for the target
Data Source
AI summary
A biosensor and method of making are disclosed. The biosensor is configured to detect a target and may include a peptide immobilized on a sensing component, the sensing component having an anode and a cathode. The immobilized peptide may comprise an antimicrobial peptide binding motif for the target. The sensing component has an electrical conductivity that changes in response to binding of the immobilized peptide to the target. The immobilized peptide may bind one or more targets selected from the list consisting of: bacteria, Gram-negative bacteria, Gram-positive bacteria, pathogens, protozoa, fungi, viruses, and cancerous cells. The biosensor may have a display with a readout that is responsive to changes in electrical conductivity of the sensing component. The display unit may be wirelessly coupled to the sensing component. A resonant circuit with an inductive coil may be electrically coupled to the sensing component. A planar coil antenna may be disposed in proximity to the resonant circuit, the planar coil antenna being configured to provide power to the sensing component.