Age & purpose verification
PeptideSeed supplies research compounds for in-vitro laboratory use only. By entering this site you confirm:
Research use only. Not for human or veterinary consumption. Full terms of supply
Status: per-lot laboratory certificates are not yet available. Every released lot has its own lot number, listed below, but the reverse-phase HPLC purity report and LAL bacterial endotoxin assay for these lots have not been generated or published. PeptideSeed is working with its supplier to obtain genuine per-lot certificates and will publish each one here, tied to its lot number, once it exists.
A certificate of analysis is the analytical record for one specific synthesis batch, identified by lot number. It is not a statement about the product line. A supplier who publishes one certificate per product rather than one per lot is showing you what some other batch looked like.
Reverse-phase HPLC separates a sample by hydrophobicity and reports the main peak's area as a percentage of total peak area. Detection is at 214 nm, where the peptide bond absorbs. Small flanking peaks are typically deletion sequences or incompletely deprotected material.
The Limulus amebocyte lysate assay measures bacterial lipopolysaccharide, reported in endotoxin units per milligram. Below 0.5 EU/mg is the PeptideSeed release specification.
Observed mass is compared against the calculated mass for the sequence. Per-lot mass-spec confirmation is not currently available for PeptideSeed lots — see the status note above.
A fuller walkthrough is in the guide on how to read a certificate of analysis, and the methods themselves are covered in HPLC purity explained and endotoxin testing explained.