Gelled Reaction Medium for Direct Microorganism Detection
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Solution Overview
Problem
Existing methods for detecting and isolating target microorganisms, particularly pathogenic bacteria like Shiga-toxin-producing E. coli (STEC), are time-consuming and laborious, requiring multiple steps including culture and PCR confirmation, and do not efficiently isolate the bacteria directly.
Innovation Solution
A gelled reaction medium using specific binding partners coupled to nanoparticles, such as antibodies or phage proteins, forms agglutinating conjugates that visually detect target microorganisms by forming a halo around the colonies, allowing direct isolation and identification without the need for additional culture steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If selective chromogenic agars are used for detection, then pathogenic bacteria can be selected and stained, but the method is not sufficiently specific and requires additional PCR confirmation steps
Solution Approach 1:
The patent combines selective culture media with specific binding partners (antibodies, phage proteins) coupled to nanoparticles in a single reaction medium. This merging allows simultaneous cultivation and specific detection of target microorganisms, eliminating the need for separate confirmation steps while maintaining high specificity.
Solution Approach 2:
The reaction medium is prepared in advance with pre-coupled binding partners and nanoparticles embedded in the gelled matrix. This preliminary preparation ensures that when the sample is inoculated, the detection mechanism is already in place, enabling immediate specific detection without requiring additional preparation or confirmation steps.
2Reliability
If multiple detection steps are implemented for accurate identification, then detection accuracy improves, but the process becomes more complex and laborious
Solution Approach 1:
The reaction medium serves multiple functions simultaneously: it acts as a selective culture medium for growing target microorganisms, contains embedded binding partners for specific detection, and provides a gelled matrix for nanoparticle distribution. This multi-functionality maintains high detection reliability while simplifying the overall process to a single integrated system.
Solution Approach 2:
The patent introduces specific binding partners (antibodies, phage proteins) as intermediaries that bridge the target microorganism and the nanoparticle detection system. These intermediaries enable highly specific recognition and detection, ensuring accurate identification while maintaining process simplicity through a single reaction medium.
3Loss of time
If traditional culture and isolation methods are used, then target bacteria can be isolated, but the process is time-consuming and does not enable rapid detection
Solution Approach 1:
The patent replaces traditional mechanical isolation methods (manual picking, sub-culturing) with a nanoparticle-based detection system. The agglutinating conjugates of nanoparticles provide visual signals directly at the location of target colonies, enabling rapid detection and precise identification without time-consuming manual isolation procedures.
Solution Approach 2:
The patent utilizes color changes of nanoparticles (such as gold nanoparticles changing from red to blue upon aggregation) as visual indicators of target microorganism presence. This color-based detection system enables rapid, accurate identification of isolated colonies without requiring additional confirmation steps, significantly reducing detection time while maintaining precision.
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 medium enables rapid and accurate detection and isolation of target microorganisms, reducing the time and effort required for confirmation steps, especially in polymicrobial samples, and facilitates the identification of specific toxin-producing strains like STEC.
Implementation Method 1
at least one specific binding partner of a component of a target microorganism or of a component derived from said microorganism, coupled to at least one nanoparticle to form at least one agglutinating conjugate
Data Source
AI summary
The invention relates to a gelled reaction medium for the detection, identification, enumeration and/or isolation of at least one target microorganism in a simple that may contain same, comprising at least one binding partner specific to a component of a target microorganism or of a component derived from said microorganism, coupled to at least one nanoparticle to form at least one binding conjugate.