Comparative Study On Antioxidant Activity Of Astaxanthin And 5 Natural Antioxidants

In recent years,due to concerns about the safety of synthetic antioxidants,natural antioxidants have become a hot spot in the research,among which,astaxanthin is widely concerned by domestic and foreign scholars because of its strong antioxidant ability.Astaxanthin is one of the most economically important carotenoids.It has a bright red color and belongs to a kind of lipid soluble pigment.In this paper,astaxanthin is the main object of study,and compared with the 5 natural antioxidants of lutein,lycopene,beta carotene,V_C and V_E.The antioxidant effects of the two vegetable oils were evaluated by in vitro antioxidant tests,and their scavenging ability to DPPH free radicals and hydroxyl radicals was also compared.It provides a theoretical basis for the application of astaxanthin as natural antioxidants.The main contents are as follows:The antioxidant effects of astaxanthin and 5 other natural antioxidants in rapeseed oil and soybean oil two edible oil and fats were studied by Schaal oven method under different add quantity,and the antioxidant effects of antioxidants were also studied under the influence factors.In addition,the ability of astaxanthin and other samples to remove DPPH free radicals and hydroxyl radicals was studied by spectrophotometry.The main results are as follows:1.In the oil system experiment,astaxanthin has good antioxidant ability to rapeseed oil and soybean oil;lycopene has some advantages in rapeseed oil,but it has poor antioxidant performance in soybean oil;lutein has a very good effect to inhibit the oxidantion of soybean oil,which is relatively low in rapeseed oil.2.The research results of the antioxidant factors showed that 0.2%of the water content has a stronger effect on the antioxidant effect of?-carotene,but the antioxidant resistance of V_E in soybean oil is slightly decreased,and it has less effect on other samples;2 mg/kg Fe³⁺and 0.2 mg/kg Cu²⁺reduce the antioxidant resistance of lycopene in soybean oil and have less effect on other samples.3.Astaxanthin and other samples in the free radical scavenging capacity,all the antioxidants have strong ability to remove DPPH free radical.V_C,astaxanthin and lycopene removal ability is the strongest,followed by?-carotene,lutein and V_E.4.When the concentration>1.0 mg/m L,the color of astaxanthin,lycopene,?-carotene and lutein is affected by the determination of the absorbance value,and the clearance rate can not be accurately determined when the high concentration is reached.V_C scavenging hydroxyl radical ability needs to be effective in the appropriate concentration range,too high concentration can not determine the authenticity of the results.The above results show that,compared with other natural antioxidants,astaxanthin has a strong antioxidant ability in oil antioxidant and scavenging free radicals,and it is a good natural antioxidant,which has great research space and application prospect in food antioxidant and health function.