Applications of Spray Freeze Drying in Processing of Pharmaceuticals and Extracts of Plant Resource

The drying characteristics of different drying methods,namely,spray drying,vacuum freeze drying and spray freeze drying,are discussed and investigated.The principle of spray freeze drying is specially discussed.The progress of studies on spray freeze drying of natural plant extracts and pharmaceuticals by foreign scholars are introduced.The characteristics of product by spray freeze drying are analyzed,and the potentials of its application fields are put forward.These provide the bases for further studies on spray freeze drying.