A "heterogeneous mixture" is a combination of different substances that can be seen separately, like a colorful salad with different ingredients. Full definition
The approach is based on field - flow fractionation (FFF), which can be used to separate complex heterogeneous mixtures of fluids and particles into their component parts — while simultaneously sorting the key components by size. (sciencedaily.com)
Unlike traditional, small - molecule drugs that can be precisely engineered in chemistry labs, biological therapeutics are proteins and similar biomolecules that are produced by plant, animal or bacterial cells, resulting in heterogeneous mixtures of closely related compounds. (scientificamerican.com)
The compounds reported in this study, particularly the phenylguanides, have advantages largely because they showed higher affinities for CXCR4 and were compounds with a defined chemical composition, rather than heterogeneous mixtures such as NB325. (thno.org)