GMO Detection Panel Using PCR and Immunoassay for Processed Food
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Solution Overview
Problem
Current methods for detecting genetically modified organisms (GMO) in food samples are prone to false negatives and false positives, leading to mislabeling of products, especially in processed foods where GMO content can be degraded or unknown, necessitating more accurate and reliable detection methods.
Innovation Solution
A method combining PCR amplification for detecting GMO gene elements and immunoassays for GMO proteins, using specific protein standards and digital PCR for processed samples, to accurately identify and quantify GMO content, including the use of P35S promoter, NOS terminator, and Cry proteins, with optional confirmation steps for DNA and protein presence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current GMO detection methods are used, then detection can be performed, but false negatives and false positives occur leading to mislabeling
Solution Approach 1:
The patent combines PCR amplification for detecting GMO gene elements with immunoassay for detecting GMO proteins into a single integrated detection system. This multi-method approach allows cross-validation of results, reducing false positives and false negatives by requiring concordance between DNA-based and protein-based detection methods
Solution Approach 2:
The detection method is segmented into multiple independent detection targets: multiple GMO gene elements (P35S promoter, NOS terminator, P34S promoter) and multiple GMO proteins (Cry1Ab, Cry2Ab, Cry34Ab1, Cry1Ac, Cry3Bb, Cry1F, VIP3a, NPTII, PMI, CP4 EPSPS, PAT). By detecting multiple separate markers rather than relying on a single marker, the system improves reliability through redundancy
2Device complexity
If single-marker detection is used, then detection is simpler, but accuracy decreases due to marker combinations shared by different GMOs
Solution Approach 1:
The patent employs detection of multiple gene elements and proteins beyond what a single-marker system would use. By detecting excessive markers (multiple promoters, terminators, and various Cry proteins), the system ensures that even if some markers are absent or degraded, others remain detectable, improving reliability at the cost of increased complexity
3Ease of operation
If only DNA detection is used, then detection is straightforward, but results are inaccurate when DNA is degraded or absent due to processing
Solution Approach 1:
The patent uses proteins as an intermediary detection target that can serve as a backup when DNA detection fails. Since proteins are more stable than DNA in processed foods and can persist even when DNA is degraded, the immunoassay detection of GMO proteins acts as a mediator to confirm GMO presence when PCR amplification yields negative or inconclusive 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
This method provides more accurate and reliable detection of GMO content, reducing false positives and negatives, and allows for precise labeling of products regarding their GMO status, even in complex food matrices where GMO origin is unknown.
Implementation Method 1
the methods described herein include the use of PCR amplification for detecting GMO gene elements
Implementation Method 2
an immunoassay for the detection of GMO proteins in a sample
Data Source
AI summary
The present application relates to the detection of material from genetically engineered Genetically Modified Organisms (GMO) using a panel of GMO proteins and GMO gene elements. In particular, the present application discloses an improved method for detecting the presence or absence of a panel of GMO proteins and gene elements in a sample.