Encapsulated DNA Pathogen Surrogates for Wash Water Validation
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Solution Overview
Problem
Current sanitation and wash processes in food processing plants face challenges in validating and verifying their effectiveness due to the reluctance to use actual pathogens, which can cause false positives and economic losses, and traditional microbial detection methods are time-consuming, leading to potential foodborne illnesses and spoilage.
Innovation Solution
The use of encapsulated DNA barcodes with non-toxic pathogen surrogates that mimic the behavior of pathogens, allowing for rapid and accurate validation and verification of sanitation processes by measuring the surrogate's behavior before and after sanitation operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If actual pathogens are used for validation of sanitation processes, then measurement precision and reliability are improved, but object-generated harmful factors worsen due to false positives and economic losses
Solution Approach 1:
The patent uses non-pathogenic bacterial surrogates that are copies or analogs of actual pathogens, designed to mimic their physical and chemical properties during sanitation processes. These surrogates contain detectable markers (such as chromogenic substrates or fluorescent tags) that allow identification without causing the harmful effects of real pathogens. This copying approach maintains measurement precision while eliminating the harmful factors associated with using actual pathogens.
Solution Approach 2:
The patent introduces an intermediary substance - a non-pathogenic surrogate organism - that mediates between the need for accurate pathogen validation and the desire to avoid harmful effects. The surrogate acts as a stand-in that interacts with sanitation processes in the same way actual pathogens would, but without causing illness or false positives. The intermediary transfers the validation function while eliminating the harmful aspects.
2Reliability
If traditional microbial detection methods are used, then reliability is improved, but loss of time worsens leading to potential foodborne illnesses and spoilage
Solution Approach 1:
The patent replaces traditional mechanical/cultural microbial detection methods (which require incubation and colony counting over days) with rapid detection systems using marked surrogates. The surrogates incorporate detectable markers such as chromogenic substrates that change color, fluorescent tags, or other rapid-detection mechanisms. This substitution maintains detection reliability while reducing validation time from days to hours or minutes, preventing foodborne illnesses and spoilage.
Solution Approach 2:
The patent changes the detection parameters by using surrogates with inherent detectable markers rather than relying on slow cultural growth methods. The markers allow for rapid detection through various means (colorimetric, fluorescent, spectroscopic) that provide results in a fraction of the time required by traditional methods. This parameter change maintains accuracy while dramatically reducing the time loss.
3Object-generated harmful factors
If non-pathogenic bacteria are used as surrogates, then object-generated harmful factors are reduced, but reliability worsens due to potential false positives from DNA fragments
Solution Approach 1:
The patent uses non-pathogenic surrogates that copy the physical and chemical behavior of pathogens during sanitation processes, but with the critical difference that they lack the harmful biological properties. The surrogates are designed to be detected through their markers rather than through cultural methods that might detect environmental DNA fragments. This copying approach maintains reliability while eliminating the harmful factors.
Solution Approach 2:
The patent employs chromogenic substrates or color-changing markers in the surrogate organisms that provide visual or instrumental detection signals. This color-based detection system allows for specific identification of the surrogate organisms without cross-reacting with environmental DNA fragments or other background materials. The color change mechanism provides reliable, unambiguous detection that avoids false positives while maintaining safety.
Data Source
AI summary
A pathogen surrogate, formed by a DNA tag or bar code and a carrier, is described for use in the validation and verification of sanitation, such as in food processing operations and for wash water systems for fresh produce. The carrier material is selected so that the pathogen surrogate mimics the behavior of a pathogen when subjected to a sanitation operation. One or more surrogates can be introduced in to an environment, which is then subjected to sanitation process, followed by a detection process using the DNA tag of the surrogate.