The essential oils obtained from Origanum glandulosum Desf., collected in four different localities of the Sètif region (north‐eastern Algeria), were analysed by GC–MS and assayed for their antioxidative effectiveness. The antioxidant capacity of the oils was measured by the modified thiobarbituric acid reactive species (TBARS) assay, using egg yolk as oxidizable substrate in presence of the radical inducer 2,2′‐azobis‐(2‐amidinopropane) dihydrochloride (ABAP). The activity was compared with those of α‐tocopherol and 2,6‐di‐tertbutyl‐4‐methyl phenol (BHT, butylated hydroxytoluene). The four oils were also endowed with a high degree of activity at the lowest concentration (100 ppm). This activity is to be ascribed to the high content of phenol components, viz. thymol and carvacrol, which strongly characterize the composition of these oils.
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Ruberto et al. (2002) studied this question.
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