Peptide purity is the single most important variable in research outcomes. Impurities from synthesis — truncated sequences, residual solvents, endotoxins — can confound even the most carefully designed study.
At Peptide Labs, every lot is tested for identity by mass spectrometry, purity by HPLC, and endotoxin levels by LAL assay. We publish a Certificate of Analysis for every batch so researchers can correlate outcomes with known input quality.
What to look for in a COA
- Identity confirmation by mass spec (±1 Da of the expected monoisotopic mass)
- Purity >98% by reversed-phase HPLC
- Endotoxin <0.5 EU/mg for injectable research use
- Residual solvents within ICH Q3C limits