Mentha longifolia
The ethyl acetate extract of M. longifolia demonstrated overall
effectiveness against all tested bacterial and fungal pathogens, as
shown in Table 6. The minimum inhibitory concentration (MIC) values
ranged from 0.08 mg / ml (P. micra ) to 5.00 mg / ml (E.
coli ). Among the Streptococcus strains, the extract had the most
significant effect on S. oralis and S. mutans , with an MIC
value of 0.60 mg / ml. However, the MBC values indicated bactericidal
effects within a range of 0.08 mg / ml (P. micra ) to 5.00 mg / ml
(S. oralis ). No bactericidal or fungicidal effects were observed
against S. mutans , S. sobrinus , E. faecalis ,C. albicans , and E. coli .
In the biofilm assay conducted with the tested strain of S.
mutans (Figure 2), the ethyl acetate extract showed a moderate
inhibitory effect on biofilm formation. Absorbance values correlated
with the category of no biofilm production for concentrations as low as
1.25 mg / ml.