1 July 2015 Fluorescent measurements of Zn2+ on a smartphone
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Proceedings Volume 9655, Fifth Asia-Pacific Optical Sensors Conference; 965511 (2015) https://doi.org/10.1117/12.2184246
Event: Fifth Asia Pacific Optical Sensors Conference, 2015, Jeju, Korea, Republic of
Using a smartphone-based portable spectrofluorimeter, measurement of metal ion concentration in water is reported. A UV LED (λex ~ 370 nm), which is powered by the internal source of the smartphone was implemented to function as the excitation source. The emission peak of the UV LED overlaps well with the absorption peak of the Zn2+-responsive molecular probe 6-(1,4,8,11-cyclam-1-yl)ethyl-1,2,3-triazol-4-yl)2-ethyl-naphthalimide fluoro-ionophore (λabs ~ 358 nm). The fluorescence emission of this dye at λem ~ 458 nm is enhanced upon coordination of Zn2+. A customized Android application digitally processes the image from a nano-imprinted polymer diffraction grating and analyses the spectral changes. Zn2+ concentration in water samples were measured with a detection limit of δ ~ 5 μM.
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Md. Arafat Hossain, Md. Arafat Hossain, Sandra Ast, Sandra Ast, John Canning, John Canning, Kevin Cook, Kevin Cook, Peter J. Rutledge, Peter J. Rutledge, Abbas Jamalipour, Abbas Jamalipour, "Fluorescent measurements of Zn2+ on a smartphone", Proc. SPIE 9655, Fifth Asia-Pacific Optical Sensors Conference, 965511 (1 July 2015); doi: 10.1117/12.2184246; https://doi.org/10.1117/12.2184246

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