Hi Sepehr

There are a very large number of encapsulation methods that can be classified as follows:

- Physical methods: spray-drying, fluid bed coating, extrusion-spheronization, centrifugal

extrusion, processes using the supercritical fluids;

- Physicochemical methods: spray-cooling, hot melt coating, ionic gelation, solvent evaporationextraction, simple or complex coacervation;

- Chemical methods: interfacial polycondensation, in situ polymerization, interfacial

polymerization, interfacial cross-linking.

But if you want more detail then read this paper. I hope it will be helpful for you.

http://www.mdpi.com/1999-4923/3/4/793

Thanks muhammad.