A material separation objective aiming to separate a material entity that has parts of different types, and end with at least one output that is a material with parts of fewer types (modulo impurities).

We should be using has the grain relations or concentrations to distinguish the portioning and other sub-objectives

separation into different composition objective

The objective to obtain cells contained in a sample of blood.

http://purl.obolibrary.org/obo/IAO_0000120