GOTS, OCA, Textile Exchange Bring Clarity On GMO Testing For Organic Cotton

Cotton Acreage

In 2019, Global Organic Textile Standard (GOTS), the Organic Cotton Accelerator (OCA) and Textile Exchange partnered to develop the ISO IWA 32:2019 protocol to create a common language among laboratories worldwide to screen for the potential presence of genetically modified (GM) cotton along the organic cotton value chain.

Following that project, the partners set out on a new initiative to bring much-needed clarity regarding the laboratories that perform testing against the international ISO reference protocol and carry out qualitative GMO testing in cottonseed, leaf, fibre, and chemically unprocessed fibre-derived materials.

The global ISO IWA 32:2019 proficiency test initiative is a collaboration between GOTS, OCA and Textile Exchange with technical support from Wageningen Food Safety Research. The joint project has reached a significant milestone: fourteen laboratories from China, Germany, India, the Netherlands, and Portugal have successfully passed the proficiency test. An overview of the laboratories that can currently conduct GMO testing as per the ISO IWA 32:2019 method has now been jointly published by GOTS, OCA & Textile Exchange, which constitutes an important milestone on the journey towards the widespread use of this standardised protocol.

Bringing clarity on GMO testing methods for the organic cotton sector
While GMOs are excluded from organic systems, organic isn’t a claim of absolute freedom from contamination or GMOs’ presence in organic products. It is a claim that GMOs are not deliberately or knowingly used and that organic producers take far-reaching steps to avoid GMO contamination along the organic cotton value chain, from farmers to spinners, to brands. To manage this, it is essential that organic cotton stakeholders can reliably test their products for the potential presence of GM cotton.

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The ISO IWA 32:2019 is a globally accepted reference protocol that was developed to screen for the potential presence of genetically modified (GM) cotton. The protocol provided the organic cotton sector with an essential tool for taking all reasonable precautions to prevent GM cotton in their organic cotton produce. Since the publication of this globally accepted reference protocol, qualitative GM cotton screening as per the ISO IWA 32:2019 is mandatory within the GOTS and OCS (Organic Content Standard) supply chain and OCA’s Farmer Engagement and Development programme.

The sector now recommends using the ISO IWA 32 protocol throughout the organic cotton value chain as the only recognised method for GMO testing. Therefore, the global ISO IWA 32:2019 proficiency test initiative’s success is vital in building confidence within the industry.

Commenting on the global ISO IWA 32:2019 proficiency test initiative, OCA’s Programme Officer, Mathilde Tournebize, said: “As a global platform, we are committed to increasing the clarity and reliability of GMO screening for the organic cotton sector. The first results of the global proficiency test initiative have given us an overview of the laboratories that can be contacted to conduct such tests. We’re hopeful that as we see more laboratories implementing the ISO IWA 32:2019 worldwide, several rounds of proficiency tests will help us all chart the labs that can be contacted to reliably conduct GMO tests. We are proud to be working in partnership with both GOTS and Textile Exchange as we are united in our belief that this proficiency test will contribute to standardising GMO testing along the organic cotton value chain. Our ambition is to reach out to more laboratories and geographies to increase the widespread use of the ISO IWA 32:2019 protocol.”

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Rahul Bhajekar, Managing Director at GOTS, added, “I am glad to see a high level of interest from laboratories across the world and results showing competence from producing and buying countries. We shall continue to further advance this collaboration with like-minded organisations to further develop the standardisation of GMO testing in cotton fibre products. We remain committed to ensuring that GOTS goods are free from GMOs.”
Amish Gosai, South Asia Manager at Textile Exchange, said, “The success of standardised testing methods depends on adaptability and uniform results. Labs achieving a successful outcome in the proficiency test, indicates both lab performance and the effectiveness of this method. We are glad to see that this initiative shows that the global ISO IWA 32 testing method gives consistent outcomes, and we look forward to more labs joining the next round of the proficiency test.”

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A first step into unifying the sector on GMO screening
The ISO IWA 32:2019 proficiency test initiative will not cease with the current laboratories; the joint initiative will be repeated regularly. More laboratories can apply for the next round of proficiency test, which will be organised, once sufficient demand has been reached.
The ISO IWA 32 protocol is also currently in the process of being converted to an International Standard by the ISO TC 34/SC 16/JWG 12 ‘Molecular biomarkers of agricultural fibres’. GOTS, OCA and Textile Exchange are participating in the working group to ensure that the organic cotton sector interests are represented.


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