Antioxidant activity of rosemary and its effect on oxidation stability of algal oil

Based on the comparative study of scavenging abilities on DPPH free radical and the reducing powers of rosemary and synthetic antioxidant BHT,the antioxidation effect of rosemary on algal oil was researched by Schaal oven method with POV(peroxide value),TBA(thiobarbituric acid) and DHA content as oxidation stability indexes,and the synergistic activity of synergist on rosemary was analyzed. The results showed that the scavenging ability on DPPH free radical and the reducing power of rosemary powder was the strongest,followed by BHT and rosemary essential oil; rosemary powder and rosemary essential oil had great protective effects on algal oil,and the antioxidant capacity of 0. 02% rosemary powder was the largest,followed by 0. 02% BHT,0. 02% rosemary essential oil and 0. 02% VE; 0. 02% rosemary powder and 0. 01% VCpalmitate exhibited excellent synergistically antioxidant activity in algal oil.