1. Freeze sample (tissue, solution, etc.) in dry ice/ethanol or -70 °C.
2. Turn on the lyophilization chamber to cool down to -20 to -40 °C.
3. Cool down the trap to -70 °C.
A poor man's lyophilization chamber.
4. Put in the sample, and turn on the vacuum.
5. Turn on the centrifugation if equipped.