Research Article

Origanum majorana Essential Oil Lacks Mutagenic Activity in the Salmonella/Microsome and Micronucleus Assays

Figure 1

Micronucleus frequency of V79 cells exposed to different O. majorana essential oil (OMEO) concentrations for 3 h (white columns) and 21 h (black columns). Negative control: DMSO (0.5%); positive control: 0.75 μg/mL colchicine (3 h) and 0.25 μg/mL etoposide (21 h). ; , in relation to the negative control (Student’s t-test).