Abstract: The leaves of Minguecao were used as raw materials, and the leaves were subjected to natural drying,microwave drying equipment and vacuum freeze-drying. The extraction of flavonoids from Minguecao by solvent extraction was carried out with ethanol as extraction reagent. Compare the effects of three drying treatment methods on the antioxidant properties of the extract.
The results showed that the extraction rate of flavonoids reached 1.73% when 65% ethanol was extracted at a ratio of 1:25 at 80 °C. The flavonoids were extracted from the leaves of Minguecao with different drying methods. The compound concentration is improved, its reducing power and ability to scavenge DPPH free radicals and superoxide anions are gradually increased; the ability to scavenge DPPH free radicals at 2mg/mL, vacuum freeze-dried samples reach a maximum of 92%; concentration is 10mg/ In mL, the ability to remove superoxide anion was achieved, and the vacuum freeze-dried sample reached a maximum of 66%; at a concentration of 0.5 mg/mL, the vacuum freeze-dried sample reached a maximum of 0.970. Therefore, vacuum freeze-drying is a better way to maintain the antioxidant activity of flavonoids in leaves of Minguecao.
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