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Proceedings Paper

Smartphone-enabled filterless fluorescence assay utilizing the pyrene excimer
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Paper Abstract

Fluorescence microscopy offers a number of advantages for cell- and biomarker-based diagnostics with regards to ease of use and interpretation, sensitivity, and specificity. However, its use in low-resource settings is often hindered by the need for bulky microscopes with expensive excitation and filter setups. While many advances have been made towards utilizing smartphones as microscopes, there remains a reliance on complex attachments to facilitate fluorescence microscopy. Here, we report progress towards a filter-less fluorescent assay utilizing ultraviolet light, an unmodified smartphone, and pyrene-labeled aptamers. The pyrene monomer is excited at a wavelength of 350 nm and emits at approximately 390 nm; when two pyrene molecules are brought into close proximity, however, they form an excimer which emits at approximately 490 nm. We have engineered pyrene-conjugated DNA sequences such that the fluorophores, normally in monomeric configuration, are brought into proximity upon binding of the DNA to its target. The large Stokes shift between excitation and emission of the excimer allows us to detect such biorecognition events with an unfiltered smartphone camera, enabling the use of this assay in low-resource settings where portability and easeof- use are paramount.

Paper Details

Date Published: 12 March 2015
PDF: 6 pages
Proc. SPIE 9314, Optics and Biophotonics in Low-Resource Settings, 93140U (12 March 2015); doi: 10.1117/12.2080225
Show Author Affiliations
John P. Goertz, Univ. of Maryland, College Park (United States)
Ian M. White, Univ. of Maryland, College Park (United States)

Published in SPIE Proceedings Vol. 9314:
Optics and Biophotonics in Low-Resource Settings
David Levitz; Aydogan Ozcan; David Erickson, Editor(s)

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