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Title: Make caffeine visible: A fluorescent caffeine "traffic light" detector
Authors: Xu, W.
Kim, T.-H.
Zhai, D.
Er, J.C.
Zhang, L.
Kale, A.A.
Agrawalla, B.K.
Cho, Y.-K.
Chang, Y.-T. 
Issue Date: 2013
Source: Xu, W., Kim, T.-H., Zhai, D., Er, J.C., Zhang, L., Kale, A.A., Agrawalla, B.K., Cho, Y.-K., Chang, Y.-T. (2013). Make caffeine visible: A fluorescent caffeine "traffic light" detector. Scientific Reports 3 : -. ScholarBank@NUS Repository.
Abstract: Caffeine has attracted abundant attention due to its extensive existence in beverages and medicines. However, to detect it sensitively and conveniently remains a challenge, especially in resource-limited regions. Here we report a novel aqueous phase fluorescent caffeine sensor named Caffeine Orange which exhibits 250-fold fluorescence enhancement upon caffeine activation and high selectivity. Nuclear magnetic resonance spectroscopy and Fourier transform infrared spectroscopy indicate that π-stacking and hydrogen-bonding contribute to their interactions while dynamic light scattering and transmission electron microscopy experiments demonstrate the change of Caffeine Orange ambient environment induces its fluorescence emission. To utilize this probe in real life, we developed a non-toxic caffeine detection kit and tested it for caffeine quantification in various beverages. Naked-eye sensing of various caffeine concentrations was possible based on color changes upon irradiation with a laser pointer. Lastly, we performed the whole system on a microfluidic device to make caffeine detection quick, sensitive and automated.
Source Title: Scientific Reports
ISSN: 20452322
DOI: 10.1038/srep02255
Appears in Collections:Staff Publications

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