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.