An increasing trend of TFC was observed with a liquid–solid ratio increasing from 5:1 to 20:1 ml g −1 , and a decreasing trend appeared with the ratio increasing from 20:1 to 30:1 ml g −1 , giving a maximum TFC of 107.76 mg g −1 .
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Extraction and purification of antioxidative flavonoids from <i>Chionanthus retusa</i> leaf.
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