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New GM testing tool aims to help GM labelling enforcement


By Nathan Gray+


Better enforcement of GM labelling laws could be just around the corner thanks a new faster and more accurate technique to test for genetically modified products in foods, suggest researchers.

The study – published in Food Control – reports on new developments in technologies for the simultaneous detection of genetically modified products in food samples.

Led by Nelson Marmiroli from the University of Parma, Italy, the research team describe an optimised method for detecting levels of approved GM maize products MON810 and GA21 in foods using specific genetic markers.

“To enforce labelling a traceability policy is required together with sensitive and accurate GM detection methods,” say the researchers. “In [the] EU an incorrect labelling of foods represents a commercial fraud.”

“The use of specific primers and of labelled probes by real-time PCR allowed for the simultaneous detection and confirmation of amplicon identity and increased the reliability of the technique and the number of PCR applications to food analysis,” they add.

GM quantification

There has been great scientific and public debate concerning the safety and the need for labelling information on genetically modified foods – especially in Europe.

“While GM food is readily accepted in the USA and in other countries, European consumers have shown considerable reluctance following previous food crises,” note Marmiroli and his colleagues.

“The increased awareness of consumers regarding the composition of foods has resulted in the need to verify any labelling statements,” they add.

As a result, the researchers suggest that food authenticity is currently ‘a subject of great concern’ to food authorities – as the incorrect labelling of foodstuffs can represent a commercial fraud.

“To meet these challenges posed by potential emerging threats, the development of novel or refinement of existing analytical methodologies for GMOs quantification is required,”

“The demand for these new analytical methods has increased, not only in countries with labelling requirements, but in general in all those that export to countries with restrictions.”

Detection technique

The new study describes quantitative multiplex real-time polymerase chain reaction (PCR) methods that are optimised for the detection of maize MON810 and GA21 crops. The authors explain that two different genes – Zein and Adh1 – were evaluated for quantitative use as accountable for continuous development of maize traits.

“The first attempt for GMO quantification in foods was based on duplex real-time PCR: one GMO plus one endogenous gene,” reveal the researchers. "Here a triplex (two GMOs plus an endogenous) is presented.”

They add that the possibility of using this technique allows for the simultaneous detection and confirmation of specific DNA fragments – thus increasing the reliability of the technique and the applicability of the platform to food analysis.

Misleading labels

The authors argue that misleading labelling might have negative liability implications anywhere in the world: “In fact the precautionary principle moves all the responsibility on the side of the producer or of the retailer.”

Labelling of GM content in foods is mandatory in many countries, including: Australia, China, the European Union, New Zealand, Norway, Japan, Russia, Saudi Arabia, South Korea, Switzerland, Taiwan.

GM labelling is considered ‘voluntary’ in Canada, Hong Kong, South Africa and USA.

Source: Food Control
Published online ahead of print, doi: 10.1016/j.foodcont.2012.08.001
“Multiplex real-time PCR assays for simultaneous detection of maize MON810 and GA21 in food samples”
Authors: Maria Cristina Samson, Mariolina Gullí, Nelson Marmiroli

4 comments (Comments are now closed)

informaton regading China is inaccurate

China does require labeling of food produced from GMOs, and offially China has been growing GM papaya, GM tomato,and GM sweet pepper (in addition to GM poplar and petunia), but no such products have been labeled as GM in the markets! So the Chinese people have no choice either just as Amercan people!

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Posted by Yinghui Zhang-Carraro
23 October 2012 | 16h372012-10-23T16:37:45Z

Re: "While GM foods are readily accepted in the USA and other countries"

Gm foods are NOT readily accepted in the USA or Canada...the people of both countries are fighting extremely hard to get GM labelling mandated. In the USA, California is voting on November 6, 2012 for Prop 37 and in Canada we are pushing for Bill C-257 41-1 to require labelling of all GM foods.

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Posted by Caroline Erger-Jarvis
23 October 2012 | 14h592012-10-23T14:59:33Z

GM Comment Nonsense

The "EU labeling regulations", i.e. EU Regs (EC) Nos. 1829/2003 and 1830/2003, constitute a shift from the detection principle, as Professor Ehlermann wants to see it still today, to the application principle.
Unfortunately for many in the food industry, this requires traceability and a fair share of documentation of the same. Eventually, with the help of documented traceability, one gets back, though, to the stage where the method reported on in today’s FoodNavigator indeed does enforce EU labeling requirements.
Prof. Ehlermann errs entirely where he claims that “EU regulations require the labelling of any food which had become in contact with genetically modified products”. The coming in contact with GM products has never been a criterion.

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Posted by Jochen Koester, Member of the Board, VLOG (Berlin)
22 October 2012 | 18h192012-10-22T18:19:21Z

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