Pathogen Detection in Milk via PCR and Extraction
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Solution Overview
Problem
Current milk testing methods for pathogens are time-consuming and prone to inconclusive results due to the need for aseptic sample collection and lengthy analysis times, which are costly and inefficient, especially when using standard dairy herd information (DHI) type collection processes.
Innovation Solution
A method involving the collection of milk samples using standard DHI processes, followed by immediate analysis in a multi-well system using specific reagents and PCR amplification to detect pathogens, even in the presence of contaminants on the udder or teat, and capable of identifying DNA fragments from antimicrobial-treated samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If aseptic collection is used to avoid pathogens on udder/teat, then false positives are reduced, but sample collection complexity and time increase
Solution Approach 1:
The invention extracts only the necessary component for detection (DNA) while leaving the harmful contaminants (pathogens on udder/teat) in the environment. By using DNA-based detection rather than culturing whole organisms, the method ignores external contaminants that don't contain the target DNA sequence, thus eliminating false positives without requiring complex aseptic collection procedures
Solution Approach 2:
The invention introduces DNA as an intermediary target for detection. Instead of directly detecting live pathogens which requires sterile conditions, the method detects DNA fragments which can be identified through specific molecular biology techniques (PCR, hybridization) that are insensitive to the presence of external contaminants, thus simplifying the collection process while maintaining detection accuracy
2Measurement precision
If traditional pathogen analysis is performed, then accurate diagnosis is achieved, but analysis time exceeds twenty-four hours
Solution Approach 1:
The invention replaces the mechanical/cultural system of pathogen growth and observation with molecular biology techniques (PCR amplification, DNA hybridization, fluorescence detection). This substitution enables rapid identification of pathogen DNA within hours rather than requiring days of cultural incubation, thus maintaining diagnostic accuracy while dramatically reducing analysis time
Solution Approach 2:
The invention performs preliminary amplification of target DNA sequences using PCR before detection. By pre-amplifying the pathogen-specific DNA sequences from the sample, the method ensures sufficient target material is available for rapid detection, enabling results within hours rather than requiring extended analysis periods for pathogen cultivation and identification
3Productivity
If DHI collection process is used for sample collection, then throughput increases, but false positives occur due to external pathogens
Solution Approach 1:
The invention extracts only the specific DNA sequences of interest while ignoring external contaminants. By using pathogen-specific primers and probes in PCR-based detection, the method selectively amplifies and detects only the target pathogen DNA, rendering external contaminants on collection equipment irrelevant and enabling use of high-throughput DHI collection processes
Solution Approach 2:
The invention uses DNA as an intermediary that can be detected through molecular techniques insensitive to collection conditions. Since DNA detection through PCR or hybridization does not require sterile conditions, the method enables use of non-aseptic DHI collection processes while maintaining detection accuracy through specific molecular recognition of pathogen DNA sequences
4Stability of the object's composition
If antimicrobial preservatives are used in DHI samples, then sample stability is improved, but pathogen viability is reduced
Solution Approach 1:
The invention replaces viability-based detection (culturing live pathogens) with DNA-based detection that works on genetic material regardless of organism viability. Since PCR and DNA hybridization techniques detect DNA sequences rather than requiring live organisms, the presence of antimicrobial preservatives that kill pathogens does not prevent detection, thus maintaining reliability while allowing sample stability improvement
Solution Approach 2:
The invention creates a copy of the pathogen's genetic information (DNA) that persists even after the original organism is killed by preservatives. By detecting the stable DNA copy rather than the vulnerable live pathogen, the method enables use of antimicrobial-preserved samples while maintaining detection reliability through molecular biology techniques that target genetic material
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
This approach enables rapid and accurate detection of pathogens with high throughput, reducing analysis time to under three hours and eliminating false positives, while maintaining sensitivity even with non-aseptic sample collection and antimicrobial preservatives.
Implementation Method 1
analyzing the samples in a multi-well system using specific reagents and polymerase chain reaction (PCR) amplification approaches
Data Source
AI summary
A method of testing milk samples for the presence of pathogens. Sample day milk may be processed using specific reagents for the detection of pathogens and then subjected to polymerase chain reaction (PCR) amplification using multi-well plates for fast and accurate detection of the presence of nucleotides from specific pathogens. The sample day milk can be collected non-aseptically without compromising the accuracy of the detection results.