Clostridia Detection Medium Using Neutral Red and Antibiotics
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Solution Overview
Problem
Current methods for detecting cheese-damaging Clostridia in milk and cheese are labor-intensive, time-consuming, and prone to false positives due to the growth of accompanying flora, leading to unreliable and inefficient spore detection.
Innovation Solution
A liquid nutrient medium containing Reinforced Clostridial Medium (RCM) with neutral red as an indicator and the antibiotics cycloserine and trimethoprim, which inhibits unwanted flora and enhances the growth of target Clostridia, allowing for faster and more reliable detection through color change or fluorescence measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the MPN method with multiple replicates and serial dilutions is used to ensure accurate detection of small amounts of Clostridia, then the detection accuracy is improved, but the labor intensity and time consumption increase significantly
Solution Approach 1:
The patent applies preliminary action by pre-enriching Clostridia spores in the nutrient medium before detection. The medium contains ingredients that promote spore germination and bacterial growth in advance, allowing the detection process to start from a higher initial concentration, thereby reducing the number of dilution steps and replicates needed while maintaining detection accuracy.
Solution Approach 2:
The patent changes the chemical parameters of the nutrient medium by adding specific antibiotics (cycloserine and trimethoprim) and growth promoters (lactate). These parameter changes create a selective environment that accelerates Clostridia growth while inhibiting competing flora, reducing the time required for accurate detection without compromising precision.
2Productivity
If conventional nutrient media are used to promote Clostridia growth, then the growth of target organisms is enhanced, but the growth of accompanying flora also occurs causing false positive results
Solution Approach 1:
The patent converts the harmful effect of accompanying flora into a benefit by using antibiotics to selectively eliminate them. The harmful competition from other bacteria is transformed into a selective advantage for Clostridia, which are resistant to the specific antibiotic combination used, thereby enhancing target growth while preventing false positives.
Solution Approach 2:
The patent introduces antibiotics as intermediary substances that mediate between the target organisms (Clostridia) and the accompanying flora. These intermediaries selectively inhibit the flora while allowing Clostridia to grow, enabling reliable detection without false positives from competing bacteria.
3Reliability
If laboratory pasteurization is applied to eliminate non-spore-forming flora, then the growth of accompanying flora is reduced, but the detection process becomes more complex and time-consuming
Solution Approach 1:
The patent replaces the mechanical/thermal pasteurization process with a chemical selection system using antibiotics. Instead of applying heat to eliminate flora, the medium chemically selects for Clostridia through antibiotic resistance, simplifying the process by eliminating pasteurization equipment and steps while maintaining reliability.
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 new medium significantly reduces detection time, minimizes false positives, and enables sensitive detection of even small amounts of Clostridial spores, providing a more accurate and efficient method for quantifying spore numbers in milk and cheese samples.
Implementation Method 1
contains a Reinforced Clostridial Medium (RCM) for incubation with milk or cheese samples, which includes neutral red as an indicator
Implementation Method 2
The nutrient medium contains a combination of the antibiotics cycloserine and trimethoprim, which, as shown in the examples below, are suitable for inhibiting the growth of undesirable accompanying flora
Data Source
AI summary
The invention relates to a liquid nutrient medium for the cultivation of cheese-spoiling clostridia, which is incubated with milk or cheese samples, wherein the nutrient medium contains a clostridial medium known per se ("Reinforced Clostridial Medium" - RCM) and includes neutral red as an indicator, and to a method for detecting cheese-spoiling clostridia in which the liquid nutrient medium is used.