The composition of the essential oil obtained by hydrodistillation from Dalea strobilacea Barneby (Fabaceae) aerial parts was examined by GC and GC/MS. β-Phellandrene (44%) together with α-pinene (18%) were the main essential oil components. Antimicrobial activity of the essential oil was evaluated against eight bacterial strains. A moderate growth inhibition of Klebsiella pneumoniae, Staphylococcus aureus and Enterococcus faecalis was shown by the essential oil.La composición del aceite esencial de Dalea strobilacea Barneby (Fabaceae) obtenido por hidrodestilación de las partes aereas fue examinada por CG y CG/EM. β-felandreno (44%) junto con α-pineno (18%) fueron los principales componentes del aceite esencial. La actividad antimicrobiana del aceite esencial fue evaluada contra ocho cepas bacterianas. El aceite esencial inhibió moderadamente el crecimiento de Klebsiella pneumoniae, Staphylococcus aureus y Enterococcus faecalis
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