建立了一种测定白桦树皮中白桦脂醇对羟自由基清除率的新方法。
A new method of determining the antioxidant activity of betulin from betula bark is established.
不同水解度的蛋白多肽清除羟自由基能力不同，结果表明水解度5%时，自由基清除率最高可达50.90%。
The different DH of walnuts peptides has different ability to scavenge hydroxyl radicals. The results showed that when DH is 5% the scavenging activity is 50.90%.
摘要 ： 以水解度（DH%）和对DPPH自由基清除率为指标，筛选出制备米糠蛋白抗氧化活性肽的最适蛋白酶。
Abstract : This study screened the most suitable prolease of preparation of bioactive peptide with the indexes of Hydrolysis (DH%) and the eliminating rate of DPPH free radical.
总酚含量、总黄酮含量可作为评价食醋抗氧化性的指标，总酚含量、总黄酮含量、DPPH自由基清除率可作为鉴别不同品种食醋的指标。
Changes of the amount of total phenolic compounds, total flavones and percent of DPPH scavenging activity in different kinds of vinegar were analyzed.
实验结果表明，超声波法可以提高山苍子油的得率，此外山苍子粗油具有较好的抗氧化作用，可以有效的清除羟自由基、超氧自由基。
The result was as the following: the extracting rate of Litsea Cubeba oil was enhanced by ultrasonic, Litsea Cubeba oil has a great effect on the elimination of free radical.
实验结果表明，超声波法可以提高山苍子油的得率，山苍子粗油可以有效清除羟自由基、超氧自由基。
The results showed that the extracting rate of Litsea Cubeba oil was enhanced by ultrasonic, and Litsea Cubeba oil has a great effect on the elimination of free radical.
通过对泡沫分离和大孔吸附树脂分离的两种不同纯度的皂苷产品清除两种自由基的考察发现，相同浓度的两种皂苷样品其清除率相近。
Although the purity of saponin from foam separation and macroporous isolated was different, the clearance ratio of these products with the same concentration was similar.
通过对泡沫分离和大孔吸附树脂分离的两种不同纯度的皂苷产品清除两种自由基的考察发现，相同浓度的两种皂苷样品其清除率相近。
Although the purity of saponin from foam separation and macroporous isolated was different, the clearance ratio of these products with the same concentration was similar.
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