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

Table 1

Elemental analysis by electron dispersive spectroscopy (EDS) of the sample PTX-SiO₂.

Element	Atomic number	wt%; (unnormalized)	wt%; (normalized)	at%	Error wt%; (1 sigma)
O	8	45.75	41.42	46.99	7.42
Si	14	44.84	40.60	26.23	1.97
C	6	17.84	16.15	24.40	4.86
N	7	2.03	1.83	2.38	1.22