Probiotic Enumeration Using Catalase and Pyruvate for Heat-Damaged Cells
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Solution Overview
Problem
Standard plating methods for enumerating viable culturable probiotic bacteria in heat-treated products exhibit high variability due to the perturbation of bacteria, leading to low recovery rates, which is not acceptable to regulatory authorities requiring microbiological plating methods.
Innovation Solution
A modified plate enumeration method using neutralizing agents like catalase and pyruvate salt to resuscitate heat-damaged bacterial cells, combined with a digestion step to release encapsulated bacteria, followed by incubation on a culture plate with agar, enhances recovery of viable culturable cell populations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard plating methods are used to enumerate viable culturable probiotic bacteria in heat-treated products, then the method is simple and regulatory-compliant, but the recovery rate is low and variability is high
Solution Approach 1:
The patent applies preliminary action by adding neutralizing agents (catalase and pyruvate) to the culture medium before plating the heat-treated sample. This pre-treatment neutralizes residual oxidizing agents from heat treatment, resuscitating stressed bacterial cells before they are plated, thereby improving recovery rates without requiring complex additional equipment or procedures.
Solution Approach 2:
The patent uses neutralizing agents (catalase and pyruvate) as intermediaries between the heat-treated sample and the culture medium. These intermediaries neutralize harmful oxidizing agents residual from heat treatment, creating a favorable environment for resuscitation of stressed bacterial cells, thereby improving colony formation and enumeration accuracy.
2Stability of the object's composition
If heat treatment is applied to the sample, then product stability and shelf life are improved, but bacterial cells are perturbed and recovery rates decrease
Solution Approach 1:
The patent converts the harm caused by heat treatment (oxidative stress to bacterial cells) into a benefit by adding neutralizing agents that specifically target and neutralize the harmful oxidizing agents. The catalase enzyme breaks down hydrogen peroxide, and pyruvate neutralizes other oxidants, transforming the damaged state into a recoverable state and improving colony formation from heat-treated samples.
3Reliability
If encapsulated bacteria are present in the sample, then probiotic delivery is enhanced, but standard plating methods cannot release and enumerate the bacteria effectively
Solution Approach 1:
The patent applies preliminary action by incorporating neutralizing agents into the culture medium before plating encapsulated bacteria. This pre-treatment ensures that when encapsulated bacteria are released and attempt to form colonies, the neutralizing agents are already present to protect them from oxidative stress, thereby improving recovery rates without adding complex release mechanisms.
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 method achieves higher recovery rates comparable to advanced techniques like FACS and qPCR, providing reliable bacterial counts suitable for regulatory compliance and commercialization.
Implementation Method 1
The culture medium typically comprises added catalase and a pyruvate salt
Implementation Method 2
The neutralising agents have been found to help resuscitate the bacterial cells that have been damaged during heat treatment
Implementation Method 3
adding an aliquot of the suspension and agar to a culture plate by a pour plate or spread plate method to provide a culture medium; incubating the culture medium to allow bacterial colonies to grow
Implementation Method 4
the method comprises a step of digesting (or otherwise treating the polymer) to release the bacteria in a first incubation step
Implementation Method 5
adding an aliquot of the suspension and agar to a culture plate by a pour plate or spread plate method to provide a culture medium
Data Source
AI summary
A method of assaying a heat treated sample containing probiotic bacteria to enumerate viable culturable probiotic bacteria in the heat treated sample, comprises: providing a suspension comprising the heat treated sample and a nutrient broth; optionally, incubating the suspension; adding an aliquot of the incubated suspension and agar to a culture plate by a pour plate or spread plate method to provide a culture medium; incubating the culture medium for a period of time to allow probiotic bacterial colonies to grow in and/or on the culture medium; and enumerating the probiotic bacterial colonies, wherein the culture medium comprises added catalase and a pyruvate salt.