Stability of Alkaloids during Drying Process and Their Effect on Anticoagulating Activity of <i>Uncariae Ramulus Cum Uncis</i>.

As shown in Figure 4 , the variation of the content of each alkaloid along with the passage of time in the drying process can be gained, which indicated that the content of the three alkaloids showed a trend of increasing firstly, achieving the peak at the 570th minute and then decreasing.

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In the rising stage of alkaloids content at the constant temperature of 65°C, the sum of peak area of three alkaloids of the sample indicated an increasing trend by prolonging the drying time, and the anticoagulant activity of the corresponding sample also showed a gradual increasing trend at the same time.

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