For 10 points, name this analytic technique in chemistry that, as its name implies, measures the weight of the fragments of a chemical compound.
SILAC involves differentially labeling two populations of cells, then analyzing them with this technique. Using this method on compounds containing bromine produces results with two peaks of equal intensity 2 units apart on the x-axis. Phenyl groups are easily identifiable because they produce a value of (*) 77 in this technique, and it usually reports a base peak of 100 on its m/z ["m over z"] scale. This technique measures the time-of-flight of fragmented ions, and then reports bar peaks based on ratios of its namesake value to charge. For 10 points, name this analytic technique in chemistry that, as its name implies, measures the weight of the fragments of a chemical compound.
SILAC involves differentially labeling two populations of cells, then analyzing them with this technique.
mass spectrometry (accept MS)