Study on optimization of extraction conditions of total flavonoids from ginger by orthogonal test

Objective To explore the optimization conditions for extraction of total flavonoids from ginger. Methods Various trials were conducted for the extraction of total flavonoids from ginger with a three-factor at three-level orthogonal array experimental design,and the content of the extracted total flavonoids was determined with UV spectrophotometry. Results The optimized experimental parameters of extraction were ratio of ginger-50% ethanol,extraction time of one reflux and reflux times as 1∶10,1.5 hours and 3 times,respectively. Conclusion The method of is simple and feasible for extracting total flavonoids from ginger.