Bacteria Detection via Microwell Segmentation
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Solution Overview
Problem
The existing bacteria detection methods using oxygen-sensitive fluorescent materials face inefficiencies due to the distance between oxygen consumption by bacteria and the fluorescent film, leading to delayed fluorescent signal emission, especially in large volumes where bacterial concentration is low.
Innovation Solution
The method involves co-localizing oxygen-quenched fluorescent nanoparticles or films with bacteria using techniques like centrifugation, electrophoresis, or affinity-based methods to ensure immediate oxygen deprivation and enhanced fluorescence signal emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If bacteria detection is performed in large volumes using oxygen-sensitive fluorescent film, then the detection can cover a wider sample range, but the detection time increases and sensitivity decreases due to the distance between oxygen consumption and fluorescent signal emission
Solution Approach 1:
The invention segments the sample into thousands of smaller microwell volumes (1-10 nL each) arranged in arrays. This segmentation increases the local concentration of bacteria in each well, enabling faster oxygen depletion and quicker fluorescent signal emission, thus reducing detection time while maintaining comprehensive sample coverage through parallel processing of multiple wells
Solution Approach 2:
The invention transitions from a single large-volume detection approach to a three-dimensional array of microwells. By organizing detection units in a spatial array configuration, the system achieves both large effective sample capacity and short detection time through parallel processing across multiple dimensions of the well array
2Quantity of substance
If bacteria concentration in large volumes is low, then the sample represents a wider range, but the fluorescent signal emission is delayed due to slower oxygen depletion
Solution Approach 1:
Segmenting the sample into numerous small microwell volumes concentrates bacteria locally in each well, ensuring sufficient bacterial presence to rapidly deplete oxygen and generate detectable fluorescent signals, thereby improving detection sensitivity while maintaining overall sample diversity through array-wide sampling
Solution Approach 2:
The invention creates multiple copies of the detection environment through parallel microwell arrays. Each well serves as an independent detection unit that amplifies the fluorescent signal through concentrated bacterial metabolism, enabling sensitive detection even when individual bacterial concentrations in the original sample are low
3Device complexity
If fluorescent material is placed away from bacteria in large volume samples, then the detection system is simpler to implement, but the fluorescent signal emission is delayed due to distance from oxygen consumption sites
Solution Approach 1:
The invention merges the fluorescent material, bacteria, and oxygen environment into a single integrated microwell system. The fluorescent film lines the microwell bottom while bacteria are trapped within the same confined volume, ensuring immediate proximity between oxygen consumption sites and fluorescent signal generation, thereby achieving fast detection without complex multi-component systems
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 rapid and highly sensitive bacteria detection by ensuring close proximity between bacteria and fluorescent materials, resulting in faster and more accurate detection of live bacteria.
Implementation Method 1
oxygen-quenched fluorescent nanoparticles or films with bacteria
Implementation Method 2
centrifugation
Implementation Method 3
electrophoresis
Implementation Method 4
affinity-based methods
Data Source
Figure 1~1a
Figure 2
Figure 3a~3b
AI summary
An improved method and related apparatus for detecting bacteria viability and drug effects using metabolic monitoring. A fluorescent material which is quenched by oxygen is co-localized with the target bacteria, and fluorescence signal is detected at the co-localized places. In some embodiments, the fluorescent material is a fluorescent nanoparticle mixed with the target bacteria in the sample, and co-localization is enhanced using centrifugation, electrophoresis, microflow path modified with antibodies, magnetic force, etc. In some other embodiments, the fluorescent material is a fluorescent film or 3-D matrix immobilized in the bacterial culture chamber, and bacteria in the sample is gathered into localized regions of the bacteria culture chamber where the fluorescent film or 3-D matrix is present by ways of centrifugation, electrophoresis or microflow path. Plasmonic nanoparticles with a metal core and plasmonic film with a metal film may be used as the fluorescent nanoparticles and fluorescent film.