Effect of liquid vehicles on the enhancement of rosmarinic acid and carvacrol release from oregano extract liquisolid compacts

Spraying and freeze-drying of various herbal extracts is often used for industrial dry herbal powder preparation. However, it is possible to produce a better quality powder applying liquisolid compact technique with the simpler preparation process. The aim of this study was to evaluate the influence of liquisolid and freeze-drying techniques on physicochemical properties of Oregano powder and the yield of its active compounds - rosmarinic acid...