42257 2017 eng 8437 8444 16 89 article American Chemical Society Washington, D.C., USA 1 -- -- -- In this work, a family of pH-responsive fluorescent probes has been designed in a rational manner with the aid of quantum chemistry tools, covering the entire pH range from 0−14. Relying on the boron−dipyrromethene (BODIPY) core, all the probes as well as selected reference dyes display very similar spectroscopic properties with ON−OFF fluorescence switching responses, facilitating optical readout in simple devices used for detection and analysis. Embedding of the probes and reference dyes into hydrogel spots on a plastic strip yielded a test strip that reversibly indicates pH with a considerably small uncertainty of ~0.1 pH units. These strips are not only reusable but, combined with a 3D-printed case that can be attached to a smartphone, the USB port of which drives the integrated LED used for excitation, allows for autonomous operation in on-site or in-the-field applications; the developed Android application software (“app”) further simplifies operation for unskilled users. Analytical Chemistry 10.1021/acs.analchem.7b01903 0003-2700 1520-6882 urn:nbn:de:kobv:b43-422571 04.10.2017 Creative Commons - Namensnennung - Nicht kommerziell - Keine Bearbeitung 3.0 Raul Gotor Pichandi Ashokkumar Mandy Hecht Karin Keil Knut Rurack eng uncontrolled Fluorescence eng uncontrolled pH measurement eng uncontrolled BODIPY eng uncontrolled Smartphone eng uncontrolled Test strip Analytische Chemie Verlagsliteratur Datei für die Öffentlichkeit verfügbar ("Open Access") https://opus4.kobv.de/opus4-bam/files/42257/AnalChem_2017_89_8437-8444.pdf