EON RESEARCH LIBRARY // Article

Reading charge states in a peptide mass spectrum

The same peptide can appear at different m/z values when its ions carry different charges. A peak position should be read with the assigned charge state rather than compared directly to a neutral mass value.

For research use only. Not for human or veterinary use.

Use the report's assignment and supporting spectrum when supplied. Do not infer a different compound simply because a labeled peak is below the catalogued molecular-mass number. Check the analytical context first.

Reading checklist

Read the charge assignment
Keep m/z distinct from neutral mass
Inspect the supporting spectrum

Reference: Mass-to-charge ratio.

Sources and further reading

IUPAC: mass-to-charge ratio

External references explain terminology and methods. They do not certify Eon products or establish suitability for human or veterinary use.