Caffeine test to tell if decaf coffee really is decaffeinated

Graphical abstractScientists 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
DOI: 10.1039/C2OB26117K

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One Response to “Caffeine test to tell if decaf coffee really is decaffeinated”

  1. Ib Knutsen says:

    Wow, I forgot to fill the captcha, and then the form didnt remember my text! Fortunately, from my old hotmail days, i remembered to select all and copy the text before pressing submit, but how annoying, You should have someone look into that.

    Now over to my previously copied message 🙂

    Hello, I am looking for a simple way of testing caffeine content of coffee, as I have come across a brand that I am sure must add coffeine to the powder, as I could not sleep from 03:00 last night, after having just one cup of latte at 12 the day before. Would you know any such method? It can be complicated, but I would prefer avoiding ancy recipies with ether or similar. Thank you.

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