Study on comparison of different extraction methods and outfieds enhancing mass-transfer mechanism of Ginkgo biloba active component
The technology conditions of solvent reflux extraction,microwave and ultrasonic extraction of flavonoids from Ginkgo biloba leaves were optimized and compared by orthogonal experiment. From microcosmic point scanning electron microscope was employed to study enhancing mass-transfer mechanism of the three methods.The results showed that under optimum extraction conditions,the flavonoids yield by these techniques were 3.10%,4.09%,3.68% respectively. The variation of cell microcosmic structure showed different extraction ways had different effect on cell organization. Microwave and ultrasonic fields made cell rupure and break more easier and lowered the mass -transfer resistance while solvent reflux extraction couldn't. For higher yield and less extraction time,microwave had obvious superiority.