Researchers at The University of Manchester have developed the world's first handheld SORS device that can detect fake spirits, such as vodka and whisky, whilst still in their bottles.
SORS, or 'spatially offset Raman spectroscopy," devices give highly accurate chemical analysis of objects and contents beneath concealing surfaces, such as glass bottles. It works by using 'an optical approach' where lasers are directed through the glass, enabling the isolation of chemically-rich information that is held within the spirits.
Such devices are already commercially available but are usually used for security and hazmat detection, screening and pharmaceutical analysis. This latest version, developed at the University's School of Chemistry in the Manchester Institute of Biotechnology (MIB), is the first time such a handheld tool is being used for a food or beverage product. The reseach has been published in Nature today (21st September).
Spirit drinks are the EU's biggest agri-food export, with EU governments' revenues of at least €23 billion in excise duties and VAT, and approximately 1 million jobs linked to the production, distribution and sale of spirit drinks.
Professor Roy Goodacre, from MIB who led the research, says: "Food and beverage counterfeiting comes with the very real potential for serious health, economic and social consequences, especially when it comes to alcohol products. An essential part of ensuring consumer confidence is to provide assurance that these products are authentic and have not been either contaminated or counterfeited."
Fake booze can also have massive implications for the health of its drinkers. Counterfeit goods do not follow the same stringent health and safety procedures major brands are forced to comply with by EU law. Therefore, counterfeit spirits often contain dangerous levels of methanol, a chemical used in antifreeze, which can cause sore throats, dizziness, sickness and even blindness.
Dr David Ellis, who co-authored the project, added: "Sales of illicit spirit drinks can also have serious health impacts when industrial alcohols or methanol are used by counterfeiters and unknowingly consumed, with multiple deaths reported worldwide each year. That is why we have developed this approach, not only to ensure brand authenticity, but also to safeguard public health."
The team tested the gadget on around 150 well-known brands of Scotch Whisky, rum, gin and vodka in closed glass containers, including 40 counterfeit products. As well as detecting the contents of fake alcohol, the researchers could also discriminate between multiple well-known Scotch Whisky brands and detect different levels of alcohol.
The team also tested the device on several bottles of spirit drinks bought 'off the shelf' from local shops. These were first measured unopened, then opened and contaminated with different levels of methanol (1, 2 and 3 %) and the tops replaced. The Handheld SORS still detected the contamination with methanol through multiple colours (clear/brown/green) of glass bottles in several types of spirit drinks including Scotch Whisky, gin, and vodka.
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David I. Ellis et al. Through-container, extremely low concentration detection of multiple chemical markers of counterfeit alcohol using a handheld SORS device, Scientific Reports (2017). DOI: 10.1038/s41598-017-12263-0