2.2.3. Freeze drying Freeze drying was performed in a lab-scale freeze dryer (Alpha 1–2 LDplus, Christ, Osterode am Harz, Germany) connected to a vacuum pump (RZ 2.5, Vacuubrand, Wertheim, Germany).
2.2.3. Freeze dryingFreeze drying was performed in a lab-scale freeze dryer (Alpha 1–2 LDplus, Christ, Osterode am Harz, Germany) connected to a vacuum pump (RZ 2.5, Vacuubrand, Wertheim, Germany).