A turn-on red-emitting fluorescent probe for determination of copper(II) ions in food samples and living zebrafish

Herein, we developed a turn-on red-emitting fluorescent probe for the sensitive and selective detection of copper ions (Cu2+) in food samples and living zebrafish. The probe employs a hemicyanine scaffold as the fluorophore and a 2-pyridinecarbonyl group as the recognition receptor and quenching moiety. The 2-pyridinecarbonyl moiety can be specifically cleaved by Cu2+ and results in an approximately 18-fold fluorescence enhancement of the probe, thereby providing a fluorescence turn-on assay for Cu2+. Additionally, the probe exhibited excellent selectivity, high sensitivity, a broad linear relationship (0.020 to 8.0 mu M), and a low limit of detection (4.0 nM, S/ N = 3) for Cu2+. Concomitantly, the probe exhibited satisfactory analytical performance when used with actual food samples. Moreover, the probe could be used for in situ determination of Cu2+ in both living plant tissues and in living zebrafish.

Automated summary

A turn-on red-emitting fluorescent probe was developed for the sensitive and selective detection of copper ions (Cu2+) in food samples and living zebrafish. The probe exhibited high sensitivity, excellent selectivity, and broad linear relationship for Cu2+, with low limit of detection. Additionally, it showed satisfactory analytical performance with actual food samples and could be used for in situ determination of Cu2+ in living plant tissues and zebrafish.