关键词: 和田玫瑰, 总黄酮, 总多糖, 抗氧化活性

Abstract:

Using VC as a positive control, the antixoidant activities of total flavonoids and total polysaccharides from rose
petals collected from Hotan, Xinjiang were evaluated by scavenging rates against DPPH, superoxide anion and hydroxyl
radicals and inhibitory rate against lipid oxidation of liver homogenate. Both total flavonoids and total polysaccharides
from rose petals had scavenging effects on DPPH, superoxide anion and hydroxyl radicals. Over the studied concentration
range, the radical scavenging activity of both extracts showed linear concentration dependence. In DPPH, superoxide anion
and hydroxyl radical scavenging assays, the IC50 of the total flavonoid extract were 2.21, 2.39 μg/mL and 2.54 μg/mL,
respectively, compared to 2.78, 2.86 μg/mL and 3.44 μg/mL for the total polysaccharide extract. Moreover, both extracts
possessed potent inhibitory effects on lipid peroxidation in a dose-dependent manner, with maximum inhibory rates of
49.87% and 69.52%, respectively. The total flavonoid extract exhibted stronger fradical scavenging activity than the total
flavonoid extract despite having anti-lipid peroxidation activity.

Key words: Hotan grown rose, total flavonoids, polysaccharides, antioxidant activity