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Emir. J. Food Agric. 2011; 23(3): 258-264

Antibacterial activity of flower extracts from
Helenium mexicanum H.B.K.

B. E. Barrera-Figueroa1
, P. D. Loeza-Lara2
, A. Hernández-García3
J. E. López-Meza4
, J. Molina-Torres5
, R. E. N. del Río-Torres3
M. M. Martínez-Pacheco3
, R. López-Gómez3
and R. Salgado-Garciglia3?.

Helenium mexicanum (Asteraceae) is used in traditional Mexican medicine. Severalstudies have shown its insecticidal activity but its antibacterial properties have not been studied. Theaim of this work was to assess the antibacterial activity of flowers extracts from H. mexicanum onten human pathogen bacteria by disc-diffusion, broth dilution and bioautographic methods. Eightdifferent extracts were obtained from H. mexicanum flowers and the antibacterial activity wasevaluated. The acetone macerates (MA) and the soxhlet-chloroform (SC) extracts showed the highestactivity against seven bacterial isolates. The MA extract was fractionated and the highest activityagainst S. aureus was shown by chloroform (CF) and methanol (MF) fractions, with MICs values of0.125 mg/mL. Bioautography analysis of CF revealed at least six antibacterial components withdifferent inhibition zones, whereas MF revealed only one inhibitory spot. Given the solubilityproperties of the active fractions, sesquiterpene lactones may comprise most of the antibacterialactive compounds of H. mexicanum. This work systematically demonstrated the antibacterial activityof flower extracts from H. mexicanum.

Key words: Medicinal plant, Helenium mexicanum, antibacterial activity, bacterial pathogens

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