Antioxidant and Antiradical SiO2 Nanoparticles Covalently Functionalized with Gallic Acid

摘要

Gallic acid (GA) and its derivatives are natural polyphenolic substances that have been widely used as antioxidants in food, health and polymer technologies. In the present work, we present the synthesis and characterization of hybrid nanomaterials prepared by covalently grafting GA antioxidant molecules on wellcharacterized SiO2 nanoparticles (NPs) of varying specific surface area (96-352 m~2/gr). All hybrid NPs were functionalized to yield the same surface-density of GA molecules (i.e. ～1 GA per nm2). The Radical-Scavenging Capacity [RSC] of the SiO2-GA NPs was quantified in comparison with pure GA based on the 2,2-diphenyl-1- picrylhydrazyl radical (DPPH.) method, by using Electron Paramagnetic Resonance and UV-Vis spectroscopy. The resulting hybrid nanomaterial possess superior antioxidant properties that can be employed in the food, polymer and biomedical industry.