LONG BEACH, Calif. — A study on relative protein quantitation by the Association of Biomolecular Research Facilities' Proteomics Research Group found that label-free mass spectrometry methods and multiplexed gel electrophoresis methods performed comparatively well in determining the relative quantitations of two unknown protein mixtures.

Non-multiplexed gel methods, such as Coomassie and silver stained gels, on the other hand, performed relatively poorly in the quantitation study.