Please read the below references and attached PDF, hope you will get fairly good idea.
1. Enhanced radical scavenging activity by antioxidant-functionalized gold nanoparticles: A novel inspiration for development of new artificial antioxidants by Nie et al (2007), Free Radical Biology and medicine , 1243-1254.
2. Antioxidant and antibacterial activity of silver nanoparticles biosynthesized using Chenopodium murale leaf extract by Mohamed et al (2014), Journal of Saudi Chemical Society 18, 356-363.
Thanks for your suggestions and help, but our work is research of enzymatic and non enzymatic components in natural foods, feed and their presence in milk, research in the samples of animal origin.Nanotechnology may apply but need expert who can apply those models.