Nanoparticle Aggregation for Microorganism Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for detecting microorganisms, especially at low concentrations, are laborious, time-consuming, and require skilled personnel, and existing nanoparticle-based methods struggle with visual detection of large targets like microorganisms.
Innovation Solution
A method involving a bifunctional linker that binds to targets, preventing nanoparticle aggregation, allowing for the detection of microorganisms through changes in sample characteristics such as color or UV-VIS spectrum, even at low concentrations, using gold or other nanoparticles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If on-target aggregation of AuNPs is used for visual detection, then detection of small biomolecules is achieved, but detection of large targets like microorganisms at low concentrations is difficult
Solution Approach 1:
The patent inverts the traditional on-target detection approach by using off-target aggregation. Instead of having nanoparticles aggregate on the target surface, free nanoparticles aggregate in solution when the target is absent, producing a visible color change. This inversion enables effective visual detection of large microorganisms at low concentrations.
Solution Approach 2:
The patent introduces a bifunctional linker as an intermediary that connects the target recognition element (antibody) to the nanoparticle. The linker's dual functionality enables both specific target binding and nanoparticle aggregation, bridging the gap between target detection and visual signal generation.
2Measurement precision
If PCR-based genetic analysis is used, then sensitive detection of bacteria is achieved, but complicated sample preparation and skilled personnel are required
Solution Approach 1:
The patent replaces complex mechanical and chemical procedures (PCR amplification, sample preparation) with a simple mixing-based assay. The detection relies on direct nanoparticle aggregation in solution, eliminating the need for sophisticated equipment and complex protocols, making it suitable for field use by untrained personnel.
Solution Approach 2:
The patent changes the detection parameters from requiring amplification (PCR) to direct visualization of nanoparticle aggregation. By monitoring color changes in the visible spectrum rather than requiring genetic amplification, the method achieves sensitivity with much simpler operational parameters.
3Reliability
If conventional detection methods are used, then detection capability is achieved, but laborious and time-consuming procedures are required
Solution Approach 1:
The patent performs preliminary action by pre-functionalizing nanoparticles with recognition elements and preparing them for immediate use. The assay requires only mixing the sample with the prepared reagents, eliminating time-consuming sample preparation steps and enabling rapid detection.
Solution Approach 2:
The patent skips intermediate steps (sample purification, amplification, complex processing) and rushes directly to the detection step where nanoparticles aggregate in the presence or absence of target. This streamlined approach maintains reliability while dramatically reducing detection time.
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
This approach enables sensitive detection of microorganisms like E. coli at concentrations below 25 cells/mL, is simple to use, and can differentiate between the presence and absence of targets, making it suitable for out-of-laboratory settings and untrained personnel.
Implementation Method 1
contacting the sample from (a) with a plurality of nanoparticles... detecting nanoparticle aggregation in the sample from (b), wherein the absence of nanoparticle aggregation indicates that the sample comprises the target
Implementation Method 2
each of the plurality of second functionalities is capable of binding to a third functionality... wherein each of the plurality of nanoparticles comprises a third functionality that is capable of binding to the second functionality
Implementation Method 3
the first functionality is capable of binding to the target, and wherein each of the plurality of second functionalities is capable of binding to a third functionality
Implementation Method 4
detecting nanoparticle aggregation in the sample from (b), wherein the absence of nanoparticle aggregation indicates that the sample comprises the target... detecting nanoparticle aggregation comprises determining at least one characteristic selected from sample color, UV-VIS spectrum, UV-VIS peak wavelength, and absorbance
Data Source
AI summary
Methods of detecting very low levels of targets, such as cells, are provided. In some embodiments, for example, the methods can detect bacteria present in a sample at concentrations less than 25 cells/mL. The method involves detecting nanoparticle aggregation in the absence of the target.