to an absorbance of 0.70 ± 0.02
at 734 nm. The resulting solution was equilibrated at 30 ◦C. An aliquot of 100 l of methanolic solution of volatile oil samples (20–100 mg/ml) and standard trolox solution (10–100 M) was
taken in different test tubes. To this 1.9 ml of ABTS radical cation solution was added to make reaction mixture with the following concentrations (1–5 mg/ml) of volatile oil.