Designing Of Optimum Dynamical Extracting Flavonoids In Gingko Leaves With Ethanol

The extraction of natural plants has a long history. increasing the yield and decreasing the cost should be analyzed and researched by modern technology during the process of extraction. Dynamic extraction of natural plants to take the valid composition is distinct from stationary extraction. Under the influence of agitation, there is a strong mobility between the solvents and materials, so the velocity of convection mass transfer is enhanced. In this experiment, with the leaf of Gingko leaf as the material, with the falconoid compound as quality criterion, the affect of dynamic extraction and stationary extraction has been compared, and the affect of the temperature ,the ratio of stuff and impregnate, the velocity of whisk and the figure of oar have been investigated.Stieeed tank reactors are widely used in industry. In a stirred tank, the swirling flow driven by the impeller interacts with the stationary baffles,and complex three-dimensional unsteady flow is resultd. The flow becomes more complex if a second phase in introduced. Tremendous efforts have been devoted to modeling of the flow in stirred tanks,and great progress has been achieved.The extracting technology of flavonoids in gingko leaves with ethanol was studied. Combined dynamical equipment whisking system with traditional orthogonal design, the change regularity of each factor can be analysed and the optimum combination can be found. The flavonoids in gingko leaves were measured by 722 raster spectrophotometer. By using this new method, the optimum extraction condition was obtained as follows: extracting temperature 75℃, ethanol concentration 50%, ratio of solid-liquid 1:30 and whisking rate 160r/min. Applying this extracting technology, the costs of production was reduced, the energy consuming was decreased, and the flavonoid content was increased. The results show that this new method is reasonable and practicable.The results show that, The effect of three—leaves axis flow oar is the best. Along with the increase of the velocity of whisk, the velocity of extraction and the quantity of extraction increase too. Along with the ratio of stuff and impregnate increase, the velocity of extraction increases too. Along with the dynamic extraction, in stated bound of temperature, the effect of the velocity of convection is comparably bigger, the quantity of extraction aggrandizement with the hoist of temperature.