A Certificate of Analysis is the batch-specific report produced when a lot of material is tested, and it is the only honest way to answer “how pure is it?”. Every research compound we stock is listed below. Where a certificate is published you can open the full report, check the batch number and follow the link to verify it on the laboratory’s own website; compounds still in testing are marked and their certificate is available by email. The batch printed on your vial always matches the certificate shipped with your order.
How every batch is tested
HPLC purity
Reverse-phase HPLC at 214–220 nm. The main peak must be at least 99% of total peak area for release.
Mass-spec identity
LC-MS confirms the observed molecular mass matches the theoretical mass for the sequence.
Independent laboratory
Testing is performed by a third-party analytical laboratory, not by the manufacturer or by us.
Reading the certificate
Check that the batch number matches your vial, that the purity method is stated, and that the identity test reports an observed mass. Our guide to interpreting a peptide COA walks through each field.
