“…Phytochemicals that exist in plant such as amino acid, proteins, vitamins, organic acid and secondary metabolites such as phenols, flavonoids, terpenoids and alkaloids are responsible for reducing metal oxide nanoparticles and capping them 24,25,26 .For Eucalyptus leave, it was found different types of biomolecules such as polyphenolic components, terpenoids and tannins can reduce Fe ions 27,28,29 ,in addition to proteins, alkaloids and small amount of fructose and glucose can be responsible for stability of produced nanoparticles. 30,31 Phytochemicals that exist in pomegranate leave can reduce metal oxide and stabilize the produced nanoparticles like polyphenols, punicalin, punicafolin, flavones glycosides, luteolin and apigenin 32,33,34 .In the same case for oolong tea extract contains polyphenols, flavonoids,catechins, lignin and terpenoid play important role as reducing and stabilizing agent 35,36,37 .…”