GMO Quantification via Standard Addition PCR Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional PCR testing methods fail to accurately determine the percentage by weight of genetically modified material (GMO) in agricultural shipments due to the presence of adventitious materials, leading to inaccurate regulatory compliance and increased costs from delayed shipments.
Innovation Solution
A method involving the addition of a known amount of adventitious material, referred to as standard addition, to the original test sample to form a final test sample, which is then analyzed using PCR or other DNA techniques to accurately determine the GMO content of both the primary and adventitious materials, ensuring accurate calculation and regulatory compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional PCR testing methods are used to determine GMO content, then the testing process is simple and quick, but the measurement accuracy deteriorates due to the presence of adventitious materials
Solution Approach 1:
The method performs preliminary identification of adventitious materials in the sample before conducting the PCR test. By detecting the presence and quantity of adventitious materials in advance, the system can then apply appropriate correction factors to the GMO content calculation, thereby improving measurement accuracy without requiring complex additional testing equipment
Solution Approach 2:
The invention introduces an intermediary calculation step that uses the detected adventitious material content as a mediator to correct the PCR test results. The system calculates the contribution of adventitious materials to the total GMO signal and subtracts this from the raw PCR measurement, yielding a corrected GMO content value that accurately reflects the primary material
2Reliability
If conventional PCR testing is performed without accounting for adventitious materials, then the testing procedure remains simple, but regulatory compliance reliability deteriorates
Solution Approach 1:
The system implements a feedback mechanism where the detected adventitious material content feeds back into the GMO content calculation process. The corrected GMO content is then compared against regulatory thresholds to determine compliance, ensuring that the final compliance determination accounts for the presence of adventitious materials and is therefore more reliable
Solution Approach 2:
The method performs preliminary identification of adventitious materials in the sample before conducting the PCR test. By detecting the presence and quantity of adventitious materials in advance, the system can then apply appropriate correction factors to the GMO content calculation, thereby improving measurement accuracy without requiring complex additional testing equipment
3Measurement precision
If standard PCR screening is used, then the testing speed is fast, but the measurement precision deteriorates leading to shipment delays
Solution Approach 1:
The testing process is segmented into two independent parallel components: (1) rapid PCR screening for GMO detection, and (2) adventitious material identification. Both components are performed using the same extracted DNA sample, and their results are combined through calculation rather than requiring sequential processing. This segmentation maintains the speed advantage while improving accuracy
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 provides a more accurate and reproducible measurement of GMO content, enabling effective characterization of the supply chain and ensuring compliance with regulatory limits, thereby reducing shipment delays and costs.
Implementation Method 1
The PCR test purports to accurately determine the % GMO present in the sample. The most common PCR test, generally known as the 35S test, evaluates the agricultural material to detect the presence of common genetic elements found in most events
Data Source
AI summary
A method including providing an initial test sample including a primary material and a relatively smaller amount of at least one adventitious material; combining the initial test sample with a standard addition of at least one adventitious material to form a final test sample, wherein the standard addition has a known amount of genetically modified adventitious material; and analyzing the final test sample to determine the % GMO of the primary material and the % GMO of the adventitious material.