Antioxidant properties of water and ethanol extracts from hot air-dried and freeze-dried daylily flowers
Antioxidant properties of water and ethanol extracts from hot air-dried and freeze-dried daylily flowers
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DOI：
10.1007/s00217-005-0007-0
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发表时间：
2006-02-01
影响因子：
3.3
通讯作者：
Fang, XH
中科院分区：
文献类型：
--
作者：
Mao, LC;Pan, X;Fang, XH
黄花菜（Hemerocallis fulva Linn.）花收获后进行热风干和冷冻干燥。从这些干花中制备水提取物和乙醇提取物，并通过总抗氧化活性、还原能力、金属螯合活性、DPPH 和超氧阴离子自由基清除活性来评估其抗氧化性能，并与标准进行比较。黄花菜花提取物表现出很强的抗氧化活性。乙醇比水更能有效地提取抗氧化剂，并且冷冻干燥比风干保留了更高的活性。冻干黄花菜的乙醇提取物显示出最高的抗氧化活性和酚含量。
Daylily (Hemerocallis fulva Linn.) flowers were hot air-dried and freeze-dried after harvest. Water and ethanol extracts were prepared from these dried flowers and their antioxidant properties were evaluated using total antioxidant activity, reducing capacity, metal chelating activity, and DPPH and superoxide anion radical scavenging activities, comparing with standards. Extracts from daylily flowers exhibited strong antioxidant activity. Ethanol was more efficienct to extract antioxidants than water and that freeze-drying preserved higher activities than air-drying. Ethanol extract from freeze-dried daylily flowers showed the highest antioxidant activity and phenol content.