What should I pay attention to when using a freeze dryer?

When using a freeze-drying machine, the following points need to be noted:

1. The sample should be frozen in a low-temperature environment. Usually, a temperature between -40 ° C and -80 ° C is a better choice.

2.Before starting vacuum drying, it is necessary to ensure that the vacuum system can reach a sufficiently high vacuum intensity to make the sublimation process more effective.

3. The heating rate should not be too fast, otherwise it may damage the sample and reduce the drying effect.

4. Before the sample is completely dried, do not open the drying chamber door to avoid introducing humidity from the outside.