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Background: This research was carried out in order to study the antimicrobial effectiveness of crude latex of two varieties of "Sangre de Drago":  Croton lechleri  Muller Arg. and Croton urucurana  Baill and compare that effectiveness to the antimicrobial activity of the alcoholic extracts of its leaves and bark.  Methods: The activity of the alcoholic extracts and latex were evaluated against bacterial strains of Staphylococcus epidermidis , Bacillus subtilis  and Escherichia coli . The extraction of the alcoholic extracts (20% Tincture) of the leaves, bark and latex from the two Croton species was carried out by maceration using 70% alcohol as a menstruum, at room temperature, for 2 to 7 days, with shaking at least twice a day.  A 20% tincture was obtained, from which the physical and chemical parameters were determined as indicated by the Ecuadorian Quality Control Standard for natural medicinal products. Results: It was found that both the alcoholic extracts of the plant material and the crude latex indicate antimicrobial activity for S. epidermidis , moderate antimicrobial activity for B. subtilis  and no antimicrobial activity for E. coli . The moderate antimicrobial activity against B. subtilis , at doses of 125 p.p.m., is in line with the findings of previous studies by other authors.  Conclusions: he antimicrobial activity of the latex of the two species against S. epidermidis  is not registered in literature and, the negative antimicrobial activity for E. coli  does not agree with what has been reported by previous studies.

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The antimicrobial activity of alcoholic extracts of leaves and bark from two varieties of ”Sangre de Drago” compared with the antimicrobial activity present in the latex of the same species