An Alcohol-Free SiO₂ Sol-Gel Matrix Functionalized with Acetic Acid as Drug Reservoir for the Controlled Release of Pentoxifylline

Figure 3

Electron dispersive spectroscopy of (a) bare PTX and (b) PTX-acetic acid-SiO₂ and (c) SiO₂. Elemental composition of particles surface is provided where carbon, nitrogen silicon, and oxygen can be detected.

(a)

(b)

(c)