Study on the flocculation of water-extraction solution of lotus leaves with composite flocculants

In order to overcome the disadvantage of high losing rate of active ingredients of traditional Chinese medicine,improve the clarity and quality of the Lotus Leaf water-extraction solution,and optimize the production process,the chitosan and the tannin flocculants were composite used to flocculate Lotus Leaf water-extraction solution in this experiment.The flocculation rate and the losing rate of flavones were used as two main parameters to estimate the different influencing factors on flocculation.Through the orthogonal experiments,the best operating flocculation condition was as follows: the dosage of chitosan was 1.071g·L-1;the dosage of tannin was 5.3579 g·L-1;the temperature was 30 ℃;the stirring rate was 60 r·min-1.Based on the orthogonal experiment,further studied the variation trend with flocculation process of each factor and the effection of the flocculation.The result turned out that the method of using the composite flocculants treat with the water-extraction solution of Lotus Leaves is more effective,and has the both advantages of reducing the losing rate of flavones and the production period.