Coffee authenticity has been a topic of interest for the Government Chemist and its collaborators for quite some time, resulting in the publication of a paper in 2017 reviewing analytical methods to detect adulteration in coffee.
Following developments in analytical techniques, and on request by the publishing journal, Dr Michael Walker and Professor Duncan Thorburn Burns, Emeritus Professor in the Institute for Global Food Security have published an update of the original paper.
The updated paper reviews the driving factors for the commercial adulteration of coffee and analytical methods for detecting different fraudulent practices:
dilution: adulteration of coffee with cheaper materials such as coffee husks, chicory, cereal grains, woody tissue, cocoa or soya beans, acai berries or exogenous sugars
incorrect geographic origin stated in label
substitution of the more expensive Arabica with cheaper beans
authenticity of Kopi Luwak coffee (coffee produced from beans digested by civet cats)
A flow diagram,
Summary of approaches to coffee authentication (PDF, 27.6KB, 1 page)
has been developed to summarise the best approaches to deal with the authentication of coffee. Encouragement is given to the interlaboratory validation of spectroscopic approaches, the exploration of civet cat DNA for the identification of Kopi Luwak, and the development of appropriately large and well-curated datasets of authenticity information across multiple techniques.