关键词: 辣木叶, 多酚, 超声辅助提取, 响应面, 抗氧化

Abstract:

In order to obtain the best ultrasound-assistedextracting conditions for polyphenols from Moringa oleifera
Lam. leaves, and clarified their antioxidant activities. Response surface methodology was used to explore the effects of
ultrasonic power, extraction time, extraction temperature, and solid to liquid ratio on extraction rate. Moreover, the reducing
power, the DPPH radical scavenging activities and the O₂^-· scavenging effect of polyphenols from Moringa oleifera Lam.
leaves were also investigated. The results showed that the best extraction condition were as follows: the extraction time of
19.5 min, the solid to liquid ratio of 1:30 (g/mL), the extraction temperature of 20.2 ℃, and the ultrasonic power of 250 W.
Under the optimal extractions, the extraction rate of phycoerythrin was (25.14 ± 0.46) mg/g. In addition, the polyphenols
from Moringa oleifera Lam. leaves. have strong anti-oxidative, and the reducing power, the DPPH radical scavenging activities
and the O₂^-· scavenging effect were 81.25%, 94.15% and 75.05% of L-ascorbic acid, respectively. This research could provide the
theoretical basis for higher preparation and antioxidants development of Moringa oleifera Lam. leaves.