conditions tested, probably because these extracts contained the
same compounds with activity against the bacillus.
Tosun et al. (2004) working with M. tuberculosis H37Ra,
considered an extract or compounds that prevent bacillus growth
up to a concentration of 200 mg/mL as a good anti-M. tuberculosis
drug candidate. Other authors have considered values such as
MIC 128 and 64 mg/mL to indicate activity against M. tuberculosis
H37Rv for extracts and pure compounds, respectively (Cantrell
et al., 2001; Gu et al., 2004).