Support
What is a lot number?
An identifier for one specific batch of material, printed on the vial. It is the key to that batch's certificate of analysis, and it is what makes a result traceable to the material in your hand rather than to a product name.
Because purity and net content are properties of a batch, an analytical result is only meaningful when it is tied to one. The lot number is that tie.
Every vial carries one, and it can be looked up in the certificate library without contacting us. The certificate you retrieve is issued by the laboratory rather than by us.
Lot pages are permanent. A lot's URL is never deleted or re-slugged once published, because people cite them — a certificate that stops resolving is worse than one that was never published.
Why it is the number worth recording
If you are keeping records of an experiment, the lot number is the detail that makes the material reproducible later. A note saying which compound and which supplier is not enough to reconstruct what was used, because two batches from the same supplier differ in net peptide content and in impurity profile. The lot number resolves to a specific set of measurements, which is the level of detail a methods section needs.
It is also what makes an unexpected result traceable. If two runs disagree and the material came from different lots, the certificates are the first place to look, and that comparison is only possible if both numbers were recorded at the time.
A lot number distinguishes a batch, not a vial. Several vials filled from one batch share it, which is what makes the certificate applicable to all of them. It is not a serial number and is not unique to the vial in front of you.
From the catalog
Compounds referenced on this page
For laboratory research use only. Not for human or veterinary consumption.