Unmodified Gold Nanoparticles for Direct Pathogen Detection
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Solution Overview
Problem
Existing methods for detecting pathogens using metallic nanoparticles require modification of nanoparticles, which can be costly, time-consuming, and require specialized equipment and expertise, limiting their effectiveness and accessibility.
Innovation Solution
A method utilizing unmodified metallic nanoparticles, such as gold nanoparticles, that associate with pathogens, causing a detectable colorimetric change, allowing for simple, rapid, and economical detection without the need for surface modification or specialized equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If modified metallic nanoparticles are used for pathogen detection, then detection specificity is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent extracts and removes the modification step from the detection system. Instead of modifying nanoparticles with specific ligands, the invention uses unmodified metallic nanoparticles that rely on their inherent surface properties to interact with pathogens, thereby eliminating the complex modification process while maintaining detection capability
Solution Approach 2:
The unmodified metallic nanoparticles self-associate with pathogens through their natural surface properties without requiring external functionalization. The nanoparticles inherently possess the ability to bind to pathogen surfaces, eliminating the need for additional modifying agents or complex conjugation procedures
2Measurement precision
If modified metallic nanoparticles are used for pathogen detection, then detection sensitivity is improved, but detection time increases
Solution Approach 1:
The metallic nanoparticles are pre-prepared in their unmodified state with optimized surface properties that enable direct interaction with pathogens. This preliminary preparation eliminates the need for time-consuming modification steps during the detection process, allowing for rapid detection while maintaining sensitivity
Solution Approach 2:
The invention skips the intermediate modification step that traditionally separates nanoparticle preparation from pathogen detection. By using unmodified nanoparticles, the process rushes through directly from nanoparticle addition to pathogen association and detection, significantly reducing overall detection time
3Measurement precision
If modified metallic nanoparticles are used for pathogen detection, then detection capability is improved, but equipment requirements and expertise increase
Solution Approach 1:
The invention employs simple, unmodified metallic nanoparticles that can be used as disposable detection reagents. These nanoparticles require no specialized preparation or handling equipment, making the detection method accessible with standard laboratory equipment and minimal expertise, thereby reducing barriers to implementation
4Ease of manufacture
If unmodified metallic nanoparticles are used for pathogen detection, then manufacturing cost and complexity are reduced, but detection specificity may be compromised
Solution Approach 1:
The invention changes the critical parameter from nanoparticle surface chemistry (modification) to nanoparticle physical properties (size, shape, surface charge) that inherently enable pathogen recognition. By optimizing these physical parameters, the unmodified nanoparticles achieve both ease of manufacture and detection specificity
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
Enables the direct detection of a broad spectrum of pathogens with high specificity and sensitivity, reducing costs and complexity, and providing a rapid diagnostic tool for various applications.
Implementation Method 1
Electrostatic interactions were used to distinguish between ssDNA and dsDNA because ssDNA adsorbs on gold and prevents their aggregation in a salt solution while dsDNA does not prevent aggregation.
Implementation Method 2
This aggregation leads to color change and thus, ssDNA remains pink while dsDNA turns blue.
Implementation Method 3
assessing the association of the nanoparticles with the pathogen to determine whether the pathogen is present or absent. In some embodiments, the method is a colorimetric method.
Data Source
AI summary
The present disclosure relates to a method for the direct detection of pathogen in a sample using unmodified metallic nanoparticles, such as gold nanoparticles. The method may employ colorimetric detection. The combination of unmodified metallic nanoparticles and colorimetric detection provides a method that is simple, rapid, and economical compared to prior art methods that require modified nanoparticles or expensive detection equipment. The method does not require labeling of the target pathogen and is capable of detecting a broad spectrum of pathogens.