Journal
BIOSENSORS & BIOELECTRONICS
Volume 91, Issue -, Pages 408-416Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2016.12.066
Keywords
Stacked genetically modified soybean; Event-specific TM-LAMP; DNAzyme-lateral flow biosensor
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Funding
- National GMO Cultivation Major Project of New Varieties [2014ZX0801202B]
- Natural Science Foundation of China [31671922]
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Stacked genetically modified organisms (GMO) are becoming popular for their enhanced production efficiency and improved functional properties, and on-site detection of stacked GMO is an urgent challenge to be solved. In this study, we developed a cascade system combining event-specific tag-labeled multiplex LAMP with a DNAzyme-lateral flow biosensor for reliable detection of stacked events (DP305423x GTS 40-3-2). Three primer sets, both event-specific and soybean species-specific, were newly designed for the tag-labeled multiplex LAMP system. A trident-like lateral flow biosensor displayed amplified products simultaneously without cross contamination, and DNAzyme enhancement improved the sensitivity effectively. After optimization, the limit of detection was approximately 0.1% (w/w) for stacked GM soybean, which is sensitive enough to detect genetically modified content up to a threshold value established by several countries for regulatory compliance. The entire detection process could be shortened to 120 min without any large-scale instrumentation. This method may be useful for the in-field detection of DP305423x GTS 40-3-2 soybean on a single kernel basis and on -site screening tests of stacked GM soybean lines and individual parent GM soybean lines in highly processed foods.
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