Enrichment in Antioxidant Flavonoids of Stamen Extracts from <i>Nymphaea lotus</i> L. Using Ultrasonic-Assisted Extraction and Macroporous Resin Adsorption.

The statistical analysis ( Table 4 ) evidenced the highly significant important effect ( p < 0.001) on TFC extracted from N. lotus stamens of aqEtOH concentration and US frequency through their linear coefficients X 1 and X 2 , quadratic coefficients X 1 2 and X 2 2 , as well as their interaction coefficient X 1 X 2 .

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