Hi, you can use different speeds of a centrifuge to separate different size of molecules. Or use different size pore of filter paper.

Please could you clarify the type of solution?

Hi, depending on the particle size of the molecules you can use reverse osmosis for larger size particle, ultra-filtration for macro molecules and micro filtration for suspension particles. for your case ultra-filtration membrane separation system is the appropriate way

The best way I foind to remove Chitosan unsolubilized particles was by using G2 or G3 glass filters under vaccum (very simple and easy to build apparatus)