Charge detection mass spectrometry (CDMS) measures the charge of individual ions directly, alongside their mass-to-charge ratio, so a true mass can be assigned ion by ion. In the analytical laboratory it complements conventional mass spectrometry for large, heterogeneous, or highly charged species that produce crowded, hard-to-deconvolute spectra.

What CDMS shows: Because each ion is measured individually, CDMS can build mass distributions for mixtures and assemblies without first resolving a charge-state series. Researchers record trapping or transit conditions, calibration approach, and the number of ions sampled, because mass accuracy and resolution depend on those experimental details and on sampling statistics.

Use in a QC workflow: CDMS is typically paired with HPLC purity testing and conventional high-resolution mass spectrometry so identity and purity findings are cross-checked by independent methods. Run reference standards, report the mass-distribution statistics used, and document sample preparation exactly.

Limitations: CDMS is a specialized, lower-throughput technique and does not replace quantitative purity or identity testing by HPLC and mass spectrometry; it supports those methods for questions they cannot answer alone.

Disclaimer: For laboratory research purposes only. Not for human consumption. The methods described are analytical laboratory techniques; no medical or therapeutic claim is made.

Citations: Standard CDMS methods literature for single-ion mass measurement of biomolecular assemblies.