Figure 2.

(a) Fluorescence spectra of MOBDP-I (10 μM) in response to ONOO⁻ (0~10 μΜ) in PBS (pH = 7.4), λ_ex = 460 nm. (b) Linear relationship between the fluorescence intensity ratio (I₅₁₀/I₅₉₆) and ONOO⁻ concentration from 0 to 10 μM. (c) Fluorescence spectra of MOBDP-I (10 μM) in the presence of 10 μM of ONOO⁻ or 50 μM of other relevant analytes. (d) The fluorescence response intensity (I₅₁₀/I₅₉₆) of MOBDP-I to ONOO⁻ (10 μM) and other relevant analytes (50 μM). Analytes: ¹O₂, ClO⁻, H₂O₂, ROO⁻, ·OH, NO₃⁻, NO₂⁻, H₂S, SO₃²⁻, HSO₃⁻, GSH, Cys, K⁺, Na⁺, Ca²⁺, Mg²⁺, Zn²⁺, Cu²⁺, Ni²⁺, Co²⁺. Samples were measured in PBS (pH = 7.4) at room temperature with λ_ex = 460 nm. The error bars represent ± standard deviation (SD) (n = 3).