Colloidal Slurry Culture Medium for Rapid Microorganism Detection
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Solution Overview
Problem
Conventional culture media methods for detecting microorganisms are cumbersome, require laboratory-trained technicians, and often fail to contain and quantify colony growth effectively, especially in user-friendly and cost-sensitive applications like the food industry.
Innovation Solution
A culture medium mixture comprising an adhesive, gelling agent, bacterial nutritive ingredient, fibrous material, and a liquid organic solvent with over 50% alcohol, forming a colloidal slurry matrix that absorbs and evenly diffuses liquid samples, allowing for rapid and uniform bacterial growth without a mesh or weave, and featuring a printed grid for colony counting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If water-absorbing elements like sponges and filter paper are used, then sample absorption is improved, but colony containment and quantitative value deteriorate
Solution Approach 1:
The patent uses a porous agar-based culture medium that absorbs liquid samples while containing colonies. The porous structure allows capillary action for sample distribution but the gel matrix confines microbial growth to discrete colonies, enabling both high sample absorption and accurate colony counting/quantification
Solution Approach 2:
The culture medium is a composite material combining agar (gelling agent), nutrients, and water-absorbing properties. This composite structure provides both the absorption capacity of water-absorbing materials and the colony-containing properties of traditional agar plates, resolving the contradiction between absorption and containment
2Quantity of substance
If some water-absorbing structures are used, then sample distribution is improved, but transparency for colony counting deteriorates
Solution Approach 1:
The porous agar matrix distributes samples uniformly through capillary action while maintaining optical transparency. The pore structure is sufficient for fluid transport but small enough to maintain gel integrity and transparency, allowing simultaneous sample distribution and colony visualization
3Reliability
If classical culture methods are used, then microorganism detection is achieved, but operational complexity and technician training requirements increase
Solution Approach 1:
The culture medium is pre-prepared with optimal nutrient composition, gelling properties, and water-absorbing capacity. This preliminary preparation eliminates the need for technicians to perform complex mixing, heating, pouring, and sterilization steps, while maintaining reliable microorganism detection through the optimized medium formulation
4Reliability
If traditional culture medium preparation is used, then microorganism culturing is achieved, but time consumption and labor requirements increase
Solution Approach 1:
The culture medium is pre-formulated and ready-to-use, with all nutrients, gelling agents, and functional properties optimized in advance. This eliminates time-consuming preparation steps including mixing, heating, pouring, and sterilization, significantly improving productivity while maintaining effective microorganism culturing
Solution Approach 2:
The culture medium is designed as a self-contained system that requires no additional preparation or assistance. The pre-prepared medium automatically performs sample absorption, nutrient provision, and colony containment functions, reducing labor requirements while ensuring reliable culturing results
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 user-friendly, efficient, and cost-effective method for detecting and identifying microorganisms, enabling rapid diffusion and uniform distribution of samples, facilitating colony counting and reducing the need for laboratory expertise.
Implementation Method 1
upon drying or evaporation of the mixture on the device, the mixture forms a colloidal slurry matrix
Implementation Method 2
having a uniform distribution of bacterial growth media adapted to absorb and evenly diffuse a liquid sample throughout the absorbent matrix
Implementation Method 3
a culture medium mixture to be applied to a device having a flat surface... forming a colloidal slurry matrix
Data Source
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AI summary
Culture medium devices and systems are shown and described. In one embodiment, the device comprises a culture medium adapted for test fluid inoculation without the concerns associated with a spreading step. In particular examples, a printed grid on the outer surface of a culture device is visible on the inner surface for colony counting after a test has been developed. The result is a device that allows for detection, identification, and transportation of various microorganisms without preparation or spreading steps, and more particularly to a culture medium in which a test fluid inoculated thereto diffuses rapidly.