Fullerenol-Capped Porous Silica Nanoparticles for pH-Responsive Drug Delivery

Figure 4

(a) UV/VIS absorbance spectra of 9-AA released from FNP/9-AA@PSN at pH values 7.35, 6.75, and 5.75. (b) Calibration curve for determination of 9-AA concentration.

(a)

(b)