The presence of metabolites like flavonoids, tannins, saponins, carbohydrates, proteins, etc. in the embedded-SFG may be responsible for the greater antibacterial activity than other AgNPs. PGKG showed good zone of inhibition against E. coli (29 mm) and S. paratyphi (25 mm). PAKG exhibits greater activity compared to all other AgNPs and standard against S. paratyphi and S. aureus.