In vitro cytotoxicity was evaluated using cultured NCTC 929
fibroblasts and antiparasitic activity was estimated in cultured
mammalian cells and the parasitic agents T. cruzi, L. braziliensis
and L. infantum. HELZJ showed an IC50 of 119.34 lg/mL in N-CTC
929 fibroblasts, demonstrating a low toxicity. Regarding anti-T.
cruzi activity using epimastigote forms, the IC50 was 612.06 lg/
mL, and for the protozoans L. braziliensis and L. infantum, IC50 values
were >5000 and 693.67 lg/mL, respectively (Table 2). These
results demonstrate that HELZJ has an antiparasitic effect. However,
this activity is not considered clinically relevant according
to Santos et al. (2012), who believe that only an IC50 less than
500 lg/mL can be considered therapeutically relevant.