Quality & Testing

Material arrives as a lot: a quantity of one compound, received together, from one source, at one time. It is booked in under a lot number and every subsequent record — available quantity, reservations, shipments, analytical documents — is attached to that lot rather than to the product name above it.

This is the foundation everything else on this page rests on. A certificate describes a specific batch of material analysed on a specific date. Presented as a property of a product line, it tells a researcher nothing checkable about the vial they were sent. Our product pages therefore name the current lot and show its documentation, not a generic document filed under the compound.

Where an analytical report exists for a lot, its details are published on the product page and are visible to anybody, signed in or not:

• the document class — certificate of analysis, HPLC, mass spectrometry, identity
• the issuing laboratory
• the laboratory’s report number
• the date the material was tested
• the assay result, where the report states one
• the analytical method, where the report states one

The document file itself is available to account holders from the product page. The summary above is public because it is what a researcher needs in order to judge whether a supplier is worth opening an account with; the file is not, because it is a customer-facing record tied to material somebody has bought.

The page says so, in those words, on that product. It does not say documentation is “pending”, “available on request” or “being updated” unless that is specifically true, because each of those phrases asserts that a certificate exists somewhere. A missing document is a fact about a lot, and stating it plainly is the only honest option.

A COA reports what an analytical laboratory measured, on a sample it received, using methods it names, on a date it records. That is a narrower claim than it is usually read as, and the difference matters:

• It describes the sample submitted. It establishes the composition of the rest of the lot only to the degree the sampling was representative.
• A purity figure is method-dependent. An HPLC purity percentage at one wavelength is not the same measurement as mass-balance purity, and the two can differ substantially for the same material.
• Identity and purity are different questions. Mass spectrometry addressing molecular mass says little about the proportion of related substances present.
• It is a snapshot at the test date. It says nothing about how the material has been stored since.

We publish the method and the test date alongside every result for exactly this reason. How to read a peptide certificate of analysis works through a document section by section.

Lyophilised material is held at freezer temperature, protected from light and moisture. Pre-solubilised solutions are held refrigerated and are not frozen. Each product page states the storage and handling conditions for that item, and those conditions are what the material is kept under here as well as what we recommend after it arrives.

Handling conditions in transit are constrained by the shipping method chosen at checkout; the shipping policy covers what is and is not offered.

Account holders open the certificate from the product page or from the order it was supplied against. If you need a document for a lot you have already received, or a document that is not shown, raise it from the message thread on your account and it will arrive attached to your order history.

Prospective customers can see everything a certificate reports — laboratory, report number, test date, assay, method — before opening an account, on the product page for each item in the catalog.

Portland Peptide Company is a supplier, not a testing laboratory. We do not perform analysis ourselves; the reports we publish are issued by the laboratories named on them. Nothing on this page is a statement about suitability for any particular application, and nothing anywhere on this site describes or implies use in humans or animals.