01
HPLC: purity
High-performance liquid chromatography separates the sample into its components and quantifies each one. The purity figure on a product page is the percentage of the sample that is the stated compound.
Purity is a measurement, not a marketing claim.
Beyond Peptides supplies research compounds, and the whole business rests on one thing: whether you can trust what is in the vial. Here is exactly what we test, how, and what documentation you can read before you order.
What gets measured
02
Mass spectrometry: identity
Purity alone does not prove identity. Mass spec confirms the molecular weight matches the compound named on the label, so a pure sample of the wrong thing cannot pass.
03
Lot traceability
Analysis is only meaningful if it belongs to the vial in your hand. Every certificate we publish names the lot it was run on, so you can match it to the batch it describes.
04
Published specification
Purity, method and lot are on every tested size, along with the CAS number, molecular formula, molecular weight and storage conditions wherever they are published, so you can read them before you order, not after.
How to read a COA
A certificate of analysis is a lab report, not a certificate of quality. These are the fields worth checking on any vendor's paperwork, ours included.
- Does the lot number match your vial?
- A COA for a different batch tells you nothing about what you received. This is the single most common gap in this industry.
- Who ran the analysis?
- An independent laboratory carries more weight than an in-house number with no attribution and no instrument trace.
- Is there an actual chromatogram?
- A real report includes the trace, not just a number typed onto a letterhead.
- Does the mass match the formula?
- Cross-check the measured molecular weight against the formula on the label. They should agree.
Requesting documentation
Want the COA for a specific lot?
Where a certificate is on file it is linked directly from the product page. If you need documentation for a lot that is not published yet, ask. Tell us the compound and the lot number and we will send what we have.
