Fig. 1. (a) Principle of fluorescence immunoassay; (b) Synthesis of probe and its reaction with carboxylesterase; (c) Schematic of simultaneous detection of multiple enzymes

Fig. 2. (a) Fluorescence spectra and linear fitting curve of pectinases at different concentrations; (b) Fluorescence spectra of probe (10 μmol·L^-1) reacting with carboxylesterase at different concentrations

Fig. 3. Fluorescence responses of immune-fluorescent probes with other interferences