Every lot is tested, then tested again

Two-stage release

A lot is first assayed in our own laboratory against its release specification. Nothing progresses to fill until purity, identity and content are within limits. After fill, a sample from the finished vials is submitted to an independent analytical laboratory that has no involvement in the synthesis.

Only when both sets of results agree is the lot released to inventory. Where they disagree, the lot is quarantined and investigated rather than reworked into stock.

What a purity percentage does and does not tell you

The purity figure on a certificate is a relative UV peak-area measurement. It states what share of UV-absorbing material at 214 nm is the target sequence. It does not account for water, counter-ion mass, or impurities that do not absorb at that wavelength.

This is why we report measured content alongside purity. Content answers the question that actually matters for quantitative work: how much target peptide is in this vial. Read them together, and use the content figure when calculating molar concentration.

Retained samples and re-testing

A retained sample from every lot is held under specification storage conditions after release. If a purity or identity question is raised later, we can re-assay the original material rather than infer from a different lot.

Raw chromatograms and mass spectra for any released lot are available to purchasers on request through our laboratory support team.

Out-of-specification handling

Material failing any release parameter does not enter inventory. Investigations trace back through the synthesis and purification record for that lot, and where a root cause affects other lots, those are quarantined for re-testing as well.