Fig. 3 | Nature Communications

Fig. 3

From: Amine-responsive cellulose-based ratiometric fluorescent materials for real-time and visual detection of shrimp and crab freshness

Fig. 3

Amine-response behavior of cellulose-based ratiometric fluorescent materials. a Schematic illustration for the mechanism of the cellulose-based ratiometric fluorescent material. b Emission spectra of the nanofibrous membrane dipping in different concentrations of ammonia. c Plot of the fluorescence intensity ratio of CA-FITC to CA-PpIX (IFITC/IPpIX) versus concentration of ammonia. Inset: fluorescence images of the membrane treated with a series of different concentrations of ammonia. d Fluorescence enhancement and quenching cycles of the emission peak at λem = 525 nm upon the nanofibrous membrane dipping in 2500 ppm ammonia and following heated. Inset: reversible color change of the nanofibrous membrane in a cycle. e Fluorescence response of the nanofibrous membrane to ammonia and other organic amines in water (2500 ppm). Excitation wavelength, 365 nm

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