Figure 2: A: UV/Vis turbidity assay to determine the disintegration rate of HSA NP after exposure to 10 mM glutathione. B: Changes in fluorescence of the DSP-cross-linked HSA NP exposed to 10 mM glutathione. When DSP-cross-linked NP were exposed to redox conditions corresponding to extracellular conditions (0.001 mM glutathione), no significant changes in fluorescence intensity were detected.