Understanding batch-specific peptide testing

What a batch is

A batch, or lot, is material produced in one defined run under one set of conditions. Two batches of the same compound are made from different starting material, on different days, with different handling in between.

Because of that, they are separate populations. Impurity profiles differ between runs even when the process is well controlled.

Why testing is only meaningful per batch

An analytical result describes the sample tested. Extending that result to a different production run is an assumption, not a measurement — and it is exactly the assumption a generic certificate quietly asks a reader to make.

This is why the batch identifier is the most important field on a certificate. Without it, the document cannot be tied to any particular material.

How traceability works in practice

Traceability is a chain of matching identifiers: the batch recorded at intake, the identifier printed on the vial label, the batch named on the certificate, and the record kept against the order.

• Intake — material is received and its batch identifier recorded.
• Documentation — any certificate received is stored against that batch.
• Labelling — the identifier is carried onto the label supplied with the material.
• Publication — where a certificate exists, it is published against the product and searchable by batch.

Where the chain breaks

• A vial with no batch identifier on the label.
• A certificate whose batch number does not appear on any label.
• Repackaging that discards the original batch reference.
• A supplier who cannot say which run a given vial came from.

Finding documentation for a specific batch

The certificate library on this site can be searched by product, strength or batch number. Where a batch has a published certificate, it appears there and on the relevant product page. Where nothing is published, no record is held for that batch.