A Working Glossary of Research-Material Quality Terms

Every certificate of analysis leans on a shared vocabulary, and most of it is never defined where a buyer can see it. These are the terms that appear on Elevate's own published certificates, defined as the laboratory uses them.

Documents and identifiers

Certificate of Analysis (COA) — the laboratory's signed record of what a specific lot was tested for and what the results were. A COA describes one lot, not a product line: a certificate without a lot number on it describes nothing.

Lot (batch) number — the identifier tying a group of vials to one production run and one set of test results. On our labels it reads like BC10-2026-001. If two vials carry the same lot number, the same certificate covers both.

Accession number — the identifier the testing laboratory assigns to the physical sample it received. It links the certificate to the lab's own internal record, which is what an access-code lookup resolves against.

Access code — a code printed on the certificate that resolves on the issuing laboratory's website to the lab's own copy of the record. It is the difference between a document a seller shows you and a record a third party holds.

Measurements

Purity (HPLC area %) — the share of everything the chromatography detector saw that was the target compound. A result like 99.72% means other detectable peaks summed to 0.28%. It does not, by itself, prove the peak is the compound named on the label — that is identity's job.

Identity — confirmation that the material is the named compound, established by comparing against a certified reference standard. Purity without identity tells you the vial is mostly one thing, not which thing.

Net peptide content — the measured mass of actual peptide in the vial, as distinct from counter-ions, residual water, and salts that also carry mass. A vial labeled 10 mg may measure above or below that in net peptide terms; the certificate reports the number rather than grading it.

Endotoxin (USP <85>) — bacterial-origin pyrogens measured per USP chapter 85. On research-material certificates this value is reported, not graded: acceptable limits depend on application and matrix, so no universal pass line exists and an honest certificate does not print one.

Elemental impurities (ICP-MS) — heavy-metal screening (lead, arsenic, cadmium, mercury) by inductively coupled plasma mass spectrometry, reported against specification limits.

Sterility (by PCR) — a nucleic-acid-based screen for microbial contamination in the sampled material.

Materials

Lyophilized — freeze-dried. The compound is supplied as a solid cake or powder from which water was removed under vacuum, which is how peptides are stabilized for storage and shipping.

Bacteriostatic water — water containing 0.9% benzyl alcohol, used in laboratories as a diluent. It is a consumable, not a peptide, which is why no peptide certificate applies to it.

Reference standard — a certified sample of known identity and purity against which a test sample is compared. The quality of an identity claim is bounded by the quality of the standard behind it.

Every term above appears on a real, signed certificate you can check yourself — start from any lot number on the verification page.