HPLC area purity: why a percentage is not a complete specification
Understand HPLC area purity, the stated report specification and measured content without treating one percentage as proof of every property.
Read the specification on the actual report
The currently published CPT reports state an area-purity specification of at least 98.0%. The older wording on this page described a universal 99% floor; that did not accurately describe this report set. Use the measured result and specification on the individual document.
Pure North commissioned Canada Peptide Testing, as a paying client. Published reports cover RP-HPLC-UV area purity and measured content for named samples and vial sizes. They do not include mass-spectrometry identity, endotoxin, sterility or water-content results. Read the original documents at Lab Results.
Area purity and content answer different questions
Area purity describes the target peak’s share of the integrated chromatographic response. It is not the peptide mass fraction of the vial, and the percentage cannot be multiplied by the label claim to calculate measured content.
Our BPC-157 worked example reads both fields from an original report. The Retatrutide walkthrough provides another example with the report’s qualifications.
What a percentage cannot establish
A purity percentage does not establish identity by mass spectrometry, sterility, endotoxin status or stability after reconstitution. It also does not predict experimental reproducibility by itself: method, sample handling and the research model matter.
Match the compound, vial size and lot or assigned reference before relying on a report. If a reference differs from the vial label, contact purenorthpeptides@proton.me for the documented connection. A report does not cover another size or future lot.
For laboratory research use only. Published analytical results do not establish clinical safety or Health Canada or FDA approval.
For laboratory research use only. Reference information, not medical advice or human-use guidance.
