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(a) T1-weighted solution MR images of HMSN@MnO2/apt under different conditions. (i: H2O; ii: pH 7.4; iii: pH 5.5; iv: pH 7.4 + GSH 5 mM and v: pH 5.5 + GSH 5 mM) after incubation at 37 °C for 1 h. (b) 1/T1 versus Mn concentrations for HMSN@MnO2/apt at (black) pH 7.4 and (red) pH 5.5 + 5 mM GSH.
