Fig. 1. (a) ¹H NMR spectra of GC in D₂O and GC–NABP in D₂O/DMSO-d₆. (b) FTIR spectra of GC and GC–NABP. (c) TEM image of GC–NABP nanoprobe. Inset: TEM image with high magnification. (d) Zeta potential of GC–NABP nanoprobe in buffers with pH values ranging from 6.0 to 7.8. (e) UV-vis spectra of GC–NABP nanoprobe (200 μg mL^–1) with and without treatment with 200 μM H₂O₂ at 37 °C for 30 min. (f) Fluorescence spectra of GC–NABP nanoprobe with and without treatment with 200 μM H₂O₂. Inset images show GC–NABP nanoprobe solutions in the absence and presence of H₂O₂ under UV light at 365 nm.