Methods / Note 05

What does a mass spectrum tell you?

Learn what mass-to-charge ratios and LC–MS measurements mean when interpreting analytical evidence in laboratory research.

Mass spectrometry characterizes ions according to their mass-to-charge ratio, commonly written as m/z, and relative abundance. The displayed values concern ions; they should not automatically be read as the mass of a neutral molecule.

Keep the method in view.

The observed pattern depends on how ions are formed and analyzed. In LC–MS, liquid chromatography separates sample components before mass-spectrometric detection. Interpret the result alongside the expected structure and the analytical method.