Antioxidative activity of purple peril (Perilla frutescens L.), Moldavian dragonhead (Dracocephalum moldavica L.), and Roman chamomile (Anthemis nobilis L.) extracts in rapeseed oil

The antioxidant activities (AA) of acetone oleoresins (AO) and deodorized a cetone extracts (DAE) of Roman chamomile (Anthemis nobilis L.), purple peri l (Perilla frutescens L.), and Moldavian dragonhead (Dracocephalum moldavic a L.) were tested in refined, bleached, and deodorized rapeseed oil by the Schaal oven test at 50 degrees C. The addition of 1,000 ppm of AO and DAE o f moldavian dragonhead and Roman chamomile significantly stabilized rapesee d oil. Their AA at the used concentration were higher than AA of a syntheti c antioxidant, butylated hydroxytoluene (200 ppm), in reducing the rate of peroxide value increase to 20 meq/kg. AA of AO of purple peril was not sign ificant, while DAE of this plant increased autoxidation induction period by 22%. It is also worthy of notice that AA of DAE from all investigated plan ts was slightly higher than AA of AO obtained from the same plants.