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. Author manuscript; available in PMC: 2017 Nov 1.
Published in final edited form as: ACS Appl Mater Interfaces. 2017 Jun 13;9(25):21133–21146. doi: 10.1021/acsami.7b04351

Figure 5.

Figure 5

Degradation kinetics of the nanoparticles: (A) On the basis of ICP-MS, mesoporous nanoparticles degraded faster than nonporous nanoparticles, and (B) OPA-GSH assay confirms more consumption of GSH in mesoporous nanoparticles than in nonporous nanoparticles. (C) Schematic of the reaction between GSH and OPA. OPA with two aldehyde groups can bind selectively to sulfur and nitrogen atoms in GSH leading to the formation of isoindole ring in GSH. The latter compound has fluorescence at excitation/emission wavelengths of 340/420 nm. (D) Nanoparticle dissolution after 15 days in DI water without GSH. Data are mean ± SD (n = 3). **, data are statistically different.