Study on extraction technics and variety trends of flavonoids in Chrysanthemum morifolium / 中草药

extraction hours. No significant difference of flavonoids content was observed among the different collecting time of C. morifolium. Conclusion The optimum extraction conditions were 75% ethanol, refluence for 1 5 h at 100 ℃ water bath for three times. The flavonoids would not be bound up with the harvest time.