|Title:||檸檬葉甲醇萃取物抗氧化性之研究||Other Titles:||Studies on Antioxidative Activity of Methanol Extracts from Lemon (Citrus limon Burm.) Leaves||Authors:||張明照
|Keywords:||冷凍乾燥檸檬老齡葉甲醇萃取物;自由基;抗氧化性;Methanol extracts from freeze-dried lemon elder age leaves (MEFDL);free radical;antioxidative activity||Issue Date:||Mar-2004||Publisher:||臺灣園藝學會||Journal Volume:||50||Journal Issue:||1||Start page/Pages:||85-98||Source:||中國園藝||Abstract:||
The objectives of this research were to investigate the antioxidative properties of methanol extracts from lemon leaves. The study items included antioxidation, antioxidative activity in different lipid peroxidation systems, and contents of antioxidants. Results showed that the extraction by methanol had higher than those by other solvents. Antioxidant capacity of methanol extracts of both freeze-dried and hot-dried elder age lemon leaves were higher than those in middle or young age. Compared with methanol extracts from hot air-dried lemon leaves (MEHDL), we found methanol extracts from freeze-dried lemon leaves (MEFDL) had better antioxidant activity. MEFDL had 63.1, 67.9, and 75.6% scavenging effect onα,α-diphenyl-β-picryhydrazyl(DPPH), superoxide anion, and hydrogen peroxide, respectively. MEFDL also showed high reducing power and chealting ability with Cu+2. MEFDL exhibited the highest antioxidative activity in autoxidation system than in other induced systems, and had higher inhibited peroxidation effects at higher dosage in any peroxidation systems. The primary antioxidant contents of ascorbic acid, α-tocopherol, β-carotene, and total phenol and in MEFDL were 0.93, 0.8, 1.69, and 2.8 mg/g, respectively.
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