Research and documentation scope
Educational laboratory information only. No medical advice, dosing, injection, administration or personal-use guidance.
What HPLC measures
High-performance liquid chromatography separates components under defined conditions. A UV chromatogram commonly reports the target peak as a percentage of total integrated detected area. That is a method-dependent purity estimate—not structural identification and not necessarily milligrams of peptide.
Column chemistry, gradient, wavelength, run time and integration rules can change the result. A percentage without the method and full peak table is difficult to interpret.
What LC-MS measures
Liquid chromatography–mass spectrometry couples separation to mass-to-charge measurement. It can support molecular-mass identity and show charge-state or isotope information. A matching mass narrows the possibilities but may not distinguish every sequence, positional isomer or stereochemical variant.
Why both are stronger together
HPLC asks how the detected components separated; MS asks whether an observed ion is consistent with the expected mass. When a report includes both, read identity first, then purity. Neither automatically reports net peptide content, sterility or safety.
A practical COA checklist
- Exact sample and batch identifier on both result sets.
- HPLC column, mobile phase, wavelength, run time and peak table.
- Expected and observed mass, ionisation mode and charge-state interpretation.
- Named laboratory, report number, dates and authorisation.
Frequently asked questions
Is HPLC the same as mass spectrometry?
No. HPLC separates detected components; mass spectrometry measures mass-to-charge information.
Can LC-MS prove the exact sequence?
It can strongly support identity, but nominal mass alone may not distinguish every isomer or sequence arrangement.
Related external reading:
- ZENTRA testing and verification overviewexternal · supplier educational page
Editorial reference only; not an endorsement.