Table 2: Antimicrobial effect of N. officinale ethanolic extract on bacteria isolated from food.

Bacteria Ethanolic extract (%)
1.56 3.12 6.25 12.5 25 50
E. coli PTCC 1270 + + + + + -
E.coli +3 +3 +3 +3 +3 -3
S. enteric PTCC 1709 + + + + + -
S. enteric +3 +3 +3 +3 +3 -3
S. aureus PTCC 1112 + + + + - -
S. aureus +3 +3 +3 +3 -3 -3
B. cereus ATCC 11778 + - - - - -
B. cereus +3 -1 -2 -3 -3 -3

(+) Bacterial growth; (-) Bacterial non-growth; (PTCC) Persian Type Culture Collection; (ATCC) American Type Culture Collection