الفهرس 
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Abstract
Ginkgo biloba is one of the oldest tree species. Most Ginkgo biloba products are made with an extract prepared from its leaves due to its containment of flavonoids, which have strong antioxidant properties, and terpenoids that help improve blood circulation. Melissa officinalis is an aromatic plant whose leaves are rich in many powerful antioxidants that protect the cells of the body from destruction, and rosmarinic acid works to maintain the health of brain cells. The purpose of this study was to evaluate the chemical properties and antioxidant activity of the active compounds of Ginkgo biloba and Melissa officinalis dried leaves powder, in addition to the biosynthesis of zinc and selenium nanoparticles from ethanol (30%) extracts of Ginkgo biloba and Melissa officinalis dried leaves powder. Additionally, studied the effect of these extracts as natural antioxidants at concentrations of (200, 400, 800) ppm in both of corn oil and mixed soybean oil compared to the synthetic antioxidant Tri butyl hydroxyl quinone (TBHQ) at concentration of (200) ppm.