Abstract: Objective To study the antioxidant capacity of camel milk powder from a brand in Xinjiang in different seasons. Methods The different batches of 2020 camel milk powder purchased in January 2021 were divided into groups according to the season,and dissolved with the appropriate proportion. The antioxidant capacity was detected by chemical model method. The oxidation and degradation ability of lipid was measured by thiobarbituric acid method,free radical scavenging ability was measured by superoxide anion scavenging method,and reducing ability was measured by ferric reduction ability plasma assay （FRAP）. Results In the ratio of oil∶camel milk powder solution=1∶1 group,the oxidation inhibition rate of camel milk powder content 25% mixed group had the highest oxidation inhibition rate,and in the ratio of oil∶camel milk powder solution=1∶3 group,the oxidation inhibition rate of camel milk powder content 25% summer group had the highest oxidation inhibition rate（all P<0.05）. When the content of camel milk powder was dissolved at 14.29%,the superoxide anion clearance rate of summer camel milk powder was lower than that of winter camel milk powder and mixed camel milk powder（both P<0.05）,and there were no statistically significant differences in the superoxide anion clearance rate of the other three groups（content was 50%,25% and 11.11%）（all P>0.05）. When the content of camel milk powder was 25% dissolved,the iron ion reduction ability of the mixed camel milk powder was the strongest,when the content of camel milk powder was 14.29% dissolved,the iron ion reduction ability of the mixed camel milk powder was the strongest,when the content of camel milk powder was 11.11% dissolved,the iron reduction ability of winter camel milk powder was strong（all P<0.05）. Conclusions The camel milk powder has certain antioxidant activity,and the antioxidant capacity of mixed camel milk powder is stronger. There is no statistically significant difference in antioxidant capacity between summer and winter camel milk powder. The inhibition rate of lipid oxidation is related to the concentration of milk powder,however,its antioxidant capacity is affected by many factors,such as sample quality,detection method and region.

Key words: Camel milk powder, Antioxidant, Thiobarbituric acid method, Superoxide anion removal, Iron ion reduction