Following up on How to perform solvent extraction of a solid I realized that I haven't quantified the size of the contaminants. I know they aren't soluble in acetone and the target is, but I don't know how small the contaminants are.
Once the target is dissolved presumably I must assume that suspended contaminants are as small as their molecular size. In this case is a filter-based extraction still possible? I don't see lab filters like extraction thimbles sold by filtration size.
In a case like this is the correct approach to run the solution through a centrifuge and then suck out the middle solution with a pipette? (Or what is the lab best practice for mechanical extraction following spinning?)