Development and application of a selective detection method for genetically modified soy and soy-derived products

Area of Science:

• Agricultural Science
• Biotechnology
• Food Science

Background:

• Distinguishing between conventional and genetically modified (GM) soybeans is crucial for regulatory compliance and consumer choice.
• Transgenic Roundup Ready soybeans possess glyphosate resistance due to an inserted Agrobacterium-derived 5-enol-pyruvyl-shikimate-3-phosphatesynthase (EPSPS) gene.

Purpose of the Study:

• To develop and validate a sensitive detection method for Roundup Ready soybeans.
• To assess the applicability of the detection method across diverse soy-based matrices.

Main Methods:

• A nested Polymerase Chain Reaction (PCR) assay was designed for specific detection of the EPSPS gene in soybeans.
• The method's sensitivity was determined using purified DNA and whole soybean samples.
• Validation was performed on various food products including soy flour, infant formula, tofu, and meat alternatives.

Main Results:

• The nested PCR method demonstrated high sensitivity, detecting as little as 10 femtograms of soybean DNA.
• Detection of Roundup Ready DNA was achieved at a minimum level of 1 modified soybean in 5000 conventional soybeans (0.02%).
• The method successfully identified Roundup Ready soybeans in complex processed food products.

Conclusions:

• The developed nested PCR method provides a reliable and sensitive tool for identifying Roundup Ready soybeans.
• This assay is applicable to a wide range of soy-based food products, supporting traceability and quality control.
• The method facilitates accurate monitoring of GM soybean content in the food supply chain.