Purity vs identity: reading a peptide report in Saskatoon

Saskatoon runs a synchrotron, so nobody here needs convincing that measurement details matter. A peptide sample can be 99% pure and 99% something you did not order. That single sentence is the argument for reading two numbers instead of one.

What Saskatoon orders

The two measurements

HPLC purity. What fraction of this sample is a single species? A high figure says the material is homogeneous. It says nothing about identity.

Mass spectrometry. Is that species the peptide on the label? The observed molecular mass is compared against the expected value for the stated sequence.

Homogeneous and wrong is a real outcome. Both are needed, and the expected mass is peptide-specific, so it is a per-product check rather than a generic one. How to read a peptide lab report works through a real report.

Scope is the other half

An analysis describes the material it was run on. Obvious in a lab, routinely ignored in purchasing, where a product-line certificate gets treated as though it characterises whatever arrives.

Only the third is evidence about your vial. Our per-vial QR code makes that link inspectable rather than asserted: each physical vial opens the report for the batch it was filled from, and different runs open different reports.

Check the vial before you use it

Every vial we ship carries its own QR code. Scanning it opens the third-party lab report for the exact batch that vial was filled from: HPLC purity, mass-spec identity, appearance, the testing lab and the date. Scan a sample at /track before you order anything.

Four things to confirm on arrival:

1. The batch number on the label matches the report the code opens.
2. The seal and stopper are intact.
3. The lyophilized cake is dry and whole, not collapsed, shrunken or tacky.
4. The colour matches what the report describes.

A vial that fails any of those is replaced. Contact support within 7 days of delivery.

Ordering in Saskatchewan

Shipping is free to Saskatoon, Prince Albert, North Battleford - and every other Canadian address - in plain unbranded packaging with no product references outside. Payment is by Interac e-Transfer with a reference number issued at checkout. No account and no minimum order.

Research use only. These are laboratory research materials, not drugs, supplements or foods. They are not approved by Health Canada or the FDA and are not for human or animal consumption. We publish no dosing guidance.