Vibrio Assay Kit with Selective Media and Signal Indicators
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Solution Overview
Problem
Current methods for detecting and quantifying pathogenic Vibrio in food and environmental samples are laborious, expensive, and prone to Type-I and Type-II errors, lacking high sensitivity and requiring additional equipment, which limits their widespread adoption and accuracy.
Innovation Solution
A novel Vibrio assay kit utilizing a combination of selective media, chemicals, and biomarkers that promote facultative anaerobic growth of Vibrio while inhibiting other microorganisms, allowing for real-time detection of a single cell within 24 hours without the need for additional machinery, using bile salt, antibiotics, and signal indicators like bromothymol blue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional detection methods are used, then Vibrio can be detected, but the process is laborious and expensive requiring additional equipment
Solution Approach 1:
The patent combines pre-enrichment, selective isolation, and detection functions into a single integrated assay kit. The kit merges multiple reagents (selective media, antibiotics, bile salts, signal indicators) and procedures into one unified system that can be performed in a single tube without requiring separate equipment for each step, thereby simplifying the detection process while maintaining high sensitivity
Solution Approach 2:
The assay kit is designed to be self-contained with all necessary reagents and instructions included. The selective media and antibiotics automatically inhibit non-target organisms while the signal indicators automatically change color when Vibrio is detected, eliminating the need for additional laboratory equipment or complex operational steps
2Measurement precision
If conventional detection methods are used, then Vibrio presence can be determined, but Type-I and Type-II errors occur reducing accuracy
Solution Approach 1:
The patent employs highly selective reagents with specific properties tailored to target Vibrio characteristics. The selective media contains antibiotics and bile salts at optimized concentrations that specifically inhibit non-target organisms while allowing Vibrio to grow. The signal indicators are chosen to respond specifically to Vibrio metabolic activities, thereby improving detection accuracy and reducing false positives and negatives
Solution Approach 2:
The assay kit includes a pre-enrichment step that prepares the sample before the selective isolation phase. This preliminary action allows Vibrio cells to recover and multiply slightly in a non-selective environment, ensuring that even low-level contamination is detectable. The pre-enrichment reduces the risk of false negatives by ensuring sufficient target organisms are present for detection
3Measurement precision
If selective media and antibiotics are used to inhibit other microorganisms, then Vibrio detection sensitivity increases, but the complexity of the assay increases
Solution Approach 1:
The patent combines multiple selective agents (antibiotics, bile salts, selective media) and detection components (signal indicators) into a single integrated reagent system. All these elements work together in one assay tube to achieve high sensitivity while simplifying the overall procedure. The kit format pre-mixes reagents in optimal proportions, eliminating the need for complex preparation steps
4Measurement precision
If multiple biochemical tests are performed to confirm Vibrio presence, then detection accuracy improves, but the time required for detection increases
Solution Approach 1:
The patent combines multiple detection functions into a single rapid assay that completes in 18-24 hours. The selective media, antibiotics, and signal indicators work simultaneously in one tube to provide both isolation and detection functions. The color-changing signal indicators provide immediate visual confirmation of Vibrio presence, eliminating the need for sequential biochemical tests and significantly 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
The solution provides a simple, inexpensive, and highly sensitive method for detecting and quantifying Vibrio, reducing false positives and negatives, and eliminating the need for extra equipment, enabling rapid and accurate monitoring of Vibrio in seafood and environmental samples.
Implementation Method 1
The invention relies on a unique combination of selective/non-selective media, chemicals, temperature, and biomarker activities of Vibrio that promote the facultative anaerobic growth and migration of Vibrio while also inhibiting the growth of other microorganisms. For example, bile salt and antibiotics such as colistin sulfate salt and polymyxin B sulfate are examples of biological chemicals that are known in the industry to increase selectivity of Vibrio at the exclusion of other microorganisms.
Implementation Method 2
this enhanced selectivity can then be evaluated and evidenced through the assay kits by altering the characteristics of a signal indicator-containing medium, such as bromothymol blue, phenol red, esculin, and ferric ammonium sulfate as signal indicators which, in turn, will provide visible evidence of the presence of pathogenic Vibrio.
Data Source
AI summary
Methods and kits for detection of bacteria, especially Vibrio parahaemolyticus and Vibrio vulnificus, are provided using a unique combination of selective ingredients and two-phase culture (solid-phase culture gel and liquid-phase culture/enrichment broth) allows for high sensitivity and specificity of the kits for growth of Vibrio parahaemolyticus and Vibrio vulnificus in the detection methods and kits. The invention, through the detection mechanism accomplished by the novel formulation of selective ingredients and the two-phase culture, allows for real-time detection of a single cell of Vibrio parahaemolyticus and Vibrio vulnificus within 24±2 hours of introducing a target sample to the Vibrio parahaemolyticus and Vibrio vulnificus detection kits.