Fig. 3. Dual-responsive release behaviour of CM-ss-MONs-Ber. (A) TEM image of CM-ss-MONs treated with glutathione (GSH) after 0 days (I), 1 day (II), 3 days (III) and 5 days (IV). (B) Ber release from ss-MONs-Ber at different pH values (pH 7.4 and 5.5) with or without GSH at the designed intervals (C) the fluorescence intensity of Ber in HepG2 cells and HL-7702 cells after treatment with ss-MONs-Ber or CM-ss-MONs-Ber for 24 h.