We built what should have been here long ago. Peptides with the most tests on the market.

Share of the main peptide in the chromatogram, with measurement uncertainty. The foundation everything else rests on.

Every side peak above 0.05 % is identified by its mass, for example oxidation or deamidation. You know what the rest is made of.

D-amino acids form during synthesis and standard HPLC often does not separate them. The mirror form changes how the molecule behaves in an experiment.

We look for fentanyl and its analogues, other peptides and synthesis intermediates. It catches a mix-up or cross-contamination that purity will not show.

A lyophilisate also contains water and salt. This number tells you how much of the mass is actually peptide.

Powder weight in the vial against the label.

The real milligrams of peptide you calculate the solution concentration from.

Two vials from one batch may differ by no more than 5 %.

Peptide, salt and water should add up to almost 100 %. If they do not, something unmeasured is in the powder.

Endotoxins trigger an inflammatory response in cells and ruin an experiment even at high purity.

Incubation in two culture media for 14 days. Nothing may grow.

Bacterial and fungal counts, and absence of E. coli, Salmonella, S. aureus and P. aeruginosa.

Cadmium, lead, arsenic, mercury and other elements within the strictest ICH Q3D limits.

Acetonitrile, DMF, dichloromethane and other synthesis solvents within ICH Q3C limits.

Residual TFA from synthesis inhibits cell growth even at low concentrations and distorts cell experiments.

Acetate or another peptide salt. Without it, the mass calculation does not add up.

A lyophilisate attracts moisture. Water speeds up degradation and changes the weighed amount.

Whether the powder dissolves into a clear, particle-free solution, and at what pH.