Objective:

to compare the in vitro antibacterial activity of the extract and essential oil of pineapple (Minthostachys mollis) leaves against two genera and five pathogenic bacterial strains.

Materials and methods:

experimental study, quantitative approach, modified Kirby-Bauer agar well method used to measure antibacterial activity.

Results:

the essential oil yield was 1,19%. The 100% essential oil was more effective in inhibiting the growth of S. aureus, Proteus spp, K. pneumoniae, E coli and P. aeruginosa with mean inhibition halos of 27 mm, 25 mm, 22 mm, 21 mm and 20 mm greater than that of the extract and doxycycline. In turn, it inhibited the growth of E. faecalis and Enterobacter spp, with greater effectiveness compared to the extract, doxycycline and ciprofloxacin. On the other hand, significant differences in inhibition means were observed in at least 2 of the groups analyzed with a p <0,05 and 95% confidence, from Tukey's one-factor ANOVA and Kruskal-Wallis.

Conclusions:

Proteus spp, S. aureus, K. pneumoniae, E. coli and P. aeruginosa were inhibited by 100% essential oil of pineapple more effectively than by the extract and doxycycline. Similarly, compared to the extract and antimicrobials, the oil was the only one that effectively inhibited the growth of Enterobacter spp. and E. faecalis.

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