Page 473 - Applied Pharmacognosy

Drying techniques

I. Open-air drying: depend on weather.
(duration from few hours to many weeks.)
1- Sun drying…..
2- Drying in sheds….
II. Drying by artificial heat:
1- Ordinary oven…..
2- Vacuum oven….
Pre-heated ovens……
III. Freeze drying or lyophilization:

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