Table 1 Growth inhibition zone diameter of synthesized nanoparticles and extract of N. sessilifolia, S. hydrangea and antibiotics against microbial strains

Gram-negative bacteria

14.00 ± 0.00^b

9.50 ± 0.50^a

8.00 ± 0.00^d

8.00 ± 0.00^d

12.00 ± 0.00^c

24.00 ± 0.00^a

K. pneumoniae

P. aeruginosa

26.00 ± 0.00^a

21.00 ± 1.00^c

ND

ND

11.00 ± 0.00^d

23.00 ± 0.00^b

Gram-positive bacteria

27.00 ± 1.00^c

23.50 ± 0.50^d

8.00 ± 0.00^e

8.00 ± 0.00^e

36.00 ± 0.00^a

31.00 ± 0.00^b

S. aureus

S. epidermidis

25.00 ± 1.00^c

22.00 ± 0.00^d

9.00 ± 0.00^e

8.50 ± 0.50^f

46.00 ± 0.00^a

32.00 ± 0.00^b