Scientists in Switzerland have synthesised a dye (3,4:3’,4’-bibenzo[b]thiophene-2,2’-disulfonate) that can be used as a sensitive and selective molecular probe for the fluorimetric detection of caffeine in water.
The system’s sensitivity and selectivity are higher than those of current synthetic caffeine sensors, so much so that caffeine can be detected in the sub-millimolar concentration range, the researchers claim. The team prepared sensor test strips on which a change in emission colour on addition of caffeine was easy to detect by the naked eye.
A ratiometric fluorescence sensor for caffeine
Nicolas Luisier, Albert Ruggi, Stephan N. Steinmann, Laurane Favre, Nicolas Gaeng, Clémence Corminboeuf and Kay Severin