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This study aims to characterize and determine the antibacterial activities of synthesized  Strobilanthes crispus -mediated AgNPs (SC-AgNPs) against  Streptococcus mutans ,  Escherichia coli  and  Pseudomonas aeruginosa. S. crispus  water extract acts as a reducing and capping agent in the synthesis of AgNPs. The synthesized AgNPs were characterized by using UV-Vis spectrophotometer, dynamic light scattering (DLS), field emission scanning electron microscope (FESEM), X-ray diffractometer (XRD) and Fourier transform infra-red (FTIR). FESEM images showed a rough surface with a spherical shape. The average size distribution of 75.25 nm with a polydispersity index (PDI) of 0.373. XRD analysis matched the face-centred cubic structure of silver. FTIR analysis revealed a shifted peak from 1404.99 to 1345.00 cm −1 . MIC and MBC values of SC-AgNPs were 1.25 mg/mL and 2.5 mg/mL against  E. coli ,  P. aeruginosa and S. mutans , respectively. Time-kill assay showed that SC-AgNPs significantly reduced bacterial growth as compared to non-treated bacteria. Morphologies of bacteria treated with SC-AgNPs were shrunk, lysed, irregular and smaller as compared to control. SC-AgNPs significantly disrupted the gene expression of  eae  A,  gtf  B and  Pel  A ( p  &lt; 0.05). This study indicated that the synthesized SC-AgNPs were stable with enhanced antibacterial activities.

artificial cells, nanomedicine, and biotechnology

Green synthesis, characterisation and antibacterial activities of  Strobilanthes crispus- mediated silver nanoparticles (SC-AGNPS) against selected bacteria