A COA is only the beginning
A certificate of analysis tells you what one laboratory measured, on one batch, using methods it chose, at one moment in time. Learning what it leaves out matters more than the number printed on the front page.
- HPLC and mass spec explained
- Sterility vs endotoxin
- Document-integrity red flags
Identity and content
Identity versus purity
Purity says what fraction of the sample is the main component. Identity says whether that component is the molecule on the label. A 99% pure sample of the wrong peptide passes a purity test perfectly.
HPLC chromatograms
The chromatogram, not the summary number, is the evidence. Look at the baseline, the peak shape, whether the full run time is shown, and whether the image has been cropped to hide late-eluting impurities.
Mass spectrometry
Confirms molecular weight and therefore identity. A COA with a purity figure and no mass confirmation has answered the easier question and skipped the harder one.
Assay and peptide content
Net peptide content is what you actually have. Gross weight includes counterions, water and residual solvent — often 10–20% of the mass, sometimes more.
Counterions and residual solvents
Trifluoroacetate and acetate salts behave differently. Residual synthesis solvents have their own toxicity profile and their own limits.
Contamination and stability
Sterility testing
Sterility is about viable organisms. It is a specific test with a specific method and duration — not something implied by a clean-looking vial.
Endotoxin testing
Bacterial endotoxin survives sterilisation. A sterile product can still carry a pyrogenic endotoxin load. These are two separate tests and a COA needs both to say anything about injectable safety.
Microbial testing
Bioburden counts on non-sterile material. Relevant to raw material quality even where sterility is not claimed.
Water content
Residual moisture drives degradation in lyophilised peptides. It is one of the most predictive numbers on a COA and one of the most frequently omitted.
Stability and degradation
Peptides oxidise, deamidate, aggregate and hydrolyse. A COA describes one moment in a product's life — usually its best one, at manufacture.
Trust in the document
Batch traceability
A batch number that ties the certificate to the physical vial in front of you. Without it, the document describes some batch, somewhere.
Laboratory accreditation
ISO/IEC 17025 accreditation covers specific tests in a defined scope. 'Accredited laboratory' with no scope named tells you nothing.
Sample-retention policy
Whether a retained sample exists that could be re-tested independently. If nothing was retained, no claim can ever be checked.
Independent versus manufacturer-paid testing
Who chose the laboratory, who chose the sample, and who paid. A manufacturer-selected sample sent to a manufacturer-paid laboratory is a weaker form of evidence, even when it is honest.
Document-integrity warning signs
Mismatched fonts, inconsistent dates, batch numbers that do not match the vial, missing method details, edited images, and figures that do not add up internally.
Coming to Biolivon Labs
COA intelligence
A tool to upload a certificate of analysis and receive a structured reading: which laboratory, which batch, which methods, what was reported, what was not tested, what accreditation is claimed, and where the document contradicts itself.
The output will be described as document analysis and nothing more. It cannot prove a sample is authentic, safe or legal — only a laboratory holding the physical material can speak to that.
Read the full COA guide →