How biomimetic amino modified mesoporous silica xerogel regulates loading and in vitro sustained delivery of levorotary ofloxacin

The purpose of this study was to facilely develop biomimetic amino modified mesoporous silica xerogel (AMSX) and study how AMSX regulated loading and in vitro sustained delivery of carboxyl-containing drug levorotary ofloxacin (LOFL). Characteristics of AMSX, including morphology, porous structure, elements and crystalline state were investigated and pharmaceutical performance of AMSX for the delivery of LOFL was studied. The result showed that AMSX was accumulational spherical nanoparticles with mesoporous structure. Hydrogen bonding force was formed between carboxylic groups of LOFL and amino groups grafted on the surface of AMSX. Furthermore, a three-level three-factorial Box–Behnken experimental design was applied to optimize the amount of major agent for synthesizing AMSX with expected drug loading capacity and also to figure out how AMSX regulated in vitro delivery of LOFL. It is believed that the present work will provide novel insights for designing mesoporous silica as drug carrier and favored the development of sustained release system.