Antibacterials Activity of Escherichia coli and Salmonella typhi by Acetone Extract of the Lichen Usnea sp.

Abstract

Lichen organisms have been used by the community as traditional herbal ingredients, especially lichens of the genus Usnea sp.. In this study, we focused on examining the effect of the acetone extract lichen Usnea sp. in inhibiting the growth of Escherichia coli and Salmonella typhi bacteria. The sample of Usnea sp. lichen was extracted using the maceration method with acetone solvent for 3×24 hours. An antibacterial test was carried out by measuring the diameter of the inhibition zone using a caliper. The results of the antibacterial test on inhibition zones at concentrations of 1.25%, 2.5%, and 5% were 21.25 mm, 26.33 mm, and 30.5 mm (E. Coli) and 23.08 mm, 26.41 mm, and 33.0 mm (S. typhi), respectively. The lichen organism Usnea sp. has very potential for treating diarrhea and fever.