Profile of Total Polyphenols, Flavonoids, and Antioxidant Activities of Different Solvent Extracts of Forsythia suspensa Leaves
Keywords:
Forsythia suspensa leaves, Extraction solvents, Polyphenols, Flavonoids, Antioxidant activityAbstract
In this paper, the effects of different solvents (aether, ethyl acetate, acetone, ethanol, and methanol) on the content of total polyphenols and flavonoids, as well as antioxidant activities of extracts from Forsythia suspensa leaves were investigated. The results showed that the contents of total polyphenols and flavonoids were significantly affected by extraction solvents, and resulting in variation of antioxidant activities of Forsythia suspensa leaves. The methanol extract exhibited high antioxidant activities because it possessed the highest total polyphenols and flavonoids content. The acetone and ethanol extracts exhibited higher antioxidant activities, while other extracts had both lower the content of active compounds and bioactivities. These results indicated that selective extraction from Forsythia suspensa leaves, by an appropriate solvent, is important for obtaining fractions with high antioxidant activity, which will be useful for the developing and application of Forsythia suspensa leaves as a new local source of bioactive compounds in foods and medicine industries.
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