Fluorescent measurements of Zn2+ on a smartphone

Md. Arafat Hossain; Sandra Ast; John Canning; Kevin Cook; Peter J. Rutledge; Abbas Jamalipour

doi:10.1117/12.2184246

1 July 2015 Fluorescent measurements of Zn²⁺ on a smartphone

Md. Arafat Hossain, Sandra Ast, John Canning, Kevin Cook, Peter J. Rutledge, Abbas Jamalipour

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

Abstract

Using a smartphone-based portable spectrofluorimeter, measurement of metal ion concentration in water is reported. A UV LED (λ_ex ~ 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 (λ_abs ~ 358 nm). The fluorescence emission of this dye at λ_em ~ 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.

Citation Download Citation

Md. Arafat Hossain, Sandra Ast, John Canning, Kevin Cook, Peter J. Rutledge, and Abbas Jamalipour "Fluorescent measurements of Zn²⁺ on a smartphone", Proc. SPIE 9655, Fifth Asia-Pacific Optical Sensors Conference, 965511 (1 July 2015); https://doi.org/10.1117/12.2184246

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