Kroyer G
Z Ernahrungswiss. 1986 Mar;25(1):63-9. doi: 10.1007/BF02023620.
The antioxidant properties of freeze-dried citrus fruit peels (orange, lemon, grapefruit) and methanolic extracts from the peel were studied. Freeze-dried orange peel showed the highest, lemon peel somewhat less and grapefruit peel the lowest but still remarkable antioxidant activity. This could be significantly improved by preparing methanolic extracts of the peels. Comparative examinations and autoxidation studies with the flavanon glycosides hesperidin and naringin as well as with their aglycones hesperetin and naringenin showed that the former are mainly responsible for the antioxidative activity of the citrus peel and extracts. In order to compare their antioxidative activity with that of the commercially available natural antioxidants alpha-tocopherol and ascorbylpalmitate, the freeze-dried citrus peels and their methanolic extracts should be used in higher concentrations, in consideration of their peculiar properties and complex natural composition. Furthermore, aspects of the correlation between antioxidant activity and molecular structure of the flavanones were discussed.
对冻干柑橘果皮（橙子、柠檬、葡萄柚）及其果皮甲醇提取物的抗氧化性能进行了研究。冻干橙皮的抗氧化活性最高，柠檬皮次之，葡萄柚皮最低，但仍具有显著的抗氧化活性。通过制备果皮的甲醇提取物，抗氧化活性可得到显著提高。用黄酮糖苷橙皮苷和柚皮苷及其苷元橙皮素和柚皮素进行的对比试验和自动氧化研究表明，前者是柑橘果皮和提取物抗氧化活性的主要原因。为了将它们的抗氧化活性与市售天然抗氧化剂α-生育酚和抗坏血酸棕榈酸酯进行比较，考虑到冻干柑橘果皮及其甲醇提取物的特殊性质和复杂的天然成分，应使用更高浓度的提取物。此外，还讨论了黄酮类化合物抗氧化活性与分子结构之间的相关性。
