In the freeze-drying process, the ice crystals in materials sublimated to the outside, and the space of the ice would remain and formed a very porous structure of the final product, therefore, it had the highest Sb value
In the freeze-drying process, the ice crystals in materialssublimated to the outside, and the space of the icewould remain and formed a very porous structure of thefinal product, therefore, it had the highest Sb value