Mass spectrometry can support identity by comparing observed mass-to-charge information with the expected molecular mass. Its conclusion depends on sample preparation, ionization, instrument range, charge-state interpretation and the selected method.
What procurement and laboratory teams should review
Compare theoretical and observed molecular mass using the correct molecular form
Check whether the report shows deconvoluted mass, charge states or fragment information
Recognize that correct mass does not quantify all impurities or net peptide content
Use orthogonal methods when sequence, modification or impurity questions require them
Read the result in the context of its method
Analytical values become decision-useful only when the sample, batch, procedure, units, acceptance criterion and result belong together. A single headline percentage cannot answer identity, purity and content questions at the same time.
- Confirm the document is lot-linked, not a generic example.
- Distinguish qualitative identification from relative purity and quantitative assay.
- Check method scope, reporting units and any stated exclusions.
Questions to resolve before quotation or release
- Which molecular form and counterion were used for the theoretical mass?
- Is the supplied report intact-mass MS, LC–MS or MS/MS?
- What other test establishes chromatographic purity?
HK PEPTIDES treats MS as identity-related evidence within an agreed analytical package. The applicable HPLC, content and other tests remain separate decisions.
Source material and further reading
This guide is informed by the following primary guidance and established technical resources. Always confirm the current version and its applicability to your material and jurisdiction.
HK PEPTIDES materials are supplied for laboratory research and documentation workflows only. They are not intended for human consumption, diagnostic use, therapeutic use, veterinary use or clinical application.