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1 Freeze drying or lyophilization is a drying method where the solvent is frozen prior to drying and is then sublimed, i.e., passed to the gas phase directly from the solid phase, below the melting point of the solvent.
Freeze drying of the product was carried out at â20Â° C, with a controlled pressure in the chamber in the range of 0.4 torr, and a shelf temperature of 30Â° C. When the injection of non-condensable gas was terminated, the product cooled rapidly, and the vapor removal rate slowed.