Figure 4 c demonstrates that the extraction yield of flavonoids maintained a significant trend of increase until the extraction time reached 40 min, but there was only a small growth in yield when the extraction time ranged from 40 to 60 min, which indicated that the dissolution of flavonoids had been completed within 40 min.
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Ultrasound-Assisted Extraction of Flavonoids from <i>Potentilla fruticosa</i> L. Using Natural Deep Eutectic Solvents.
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