[Extraction optimization study of flavonoids from Humulus lupulus].
OBJECTIVE
To optimize extracting parameters of flavonoids from Humulus lupulus.


METHODS
Based on the single factors test on ethanol concentration, material and solvent ratio, extracting temperature and extracting time, orthogonal test was performed and the best combination was confirmed.


RESULTS
With the optimized technology, the maximal extracting amount of flavonoids from H. lupulus was 78 mg x g(-1).


CONCLUSIONS
The optimal techniques obtained are 45% ethanol extracting at 60 degrees C with material and solvent ratio 1:25 for 90 min.
Xiong
Hao-ping
HP
College of Biosystem Engineering and Food Science, Zhejiang University, Hangzhou 310029, China.
He
Guo-qing
GQ
Xuan
Guo-dong
GD
Ruan
Hui
H
D000431:Ethanol; D005419:Flavonoids / Q000302:isolation & purification*; D035264:Flowers / Q000737:chemistry; D027582:Humulus / Q000737:chemistry*; D010946:Plants, Medicinal / Q000737:chemistry*; D013678:Technology, Pharmaceutical / Q000379:methods*; D013696:Temperature; D013995:Time
D005419:Flavonoids; D000431:Ethanol