Expert articles on peptide analysis, quality control, and analytical techniques from our laboratory scientists
From HPLC purity data and mass spectrometry guides to GLP-1 peptide testing trends and compounding pharmacy compliance, practical guidance for researchers and pharmacies.
A line-by-line walkthrough of a peptide certificate of analysis: which numbers matter, which ones suppliers inflate, and how to verify a COA independently.
How independent labs test retatrutide for purity, identity, and related substances — and why the triple agonist structure raises specific analytical challenges.
Independent peptide purity testing pricing explained — method breakdown, why HPLC-only is cheaper than a full panel, and how sample count changes per-sample cost.
Independent testing considerations for 5-Amino-1MQ (5-amino-1-methylquinolinium) — a small molecule NNMT inhibitor, not a peptide, and why testing it correctly uses different methods.
A direct comparison of what a good tirzepatide COA and semaglutide COA should show — purity thresholds, related substances, identity confirmation, and contaminant panels.
A practical guide to endotoxin testing for peptides — when the LAL kinetic chromogenic assay is required, how EU per mg limits are set, and what a compliant endotoxin report looks like.
A field guide to reading HPLC chromatograms and purity tables on a peptide COA — retention time, area percent, related substances, and the peaks reviewers actually check.
A side-by-side breakdown of manufacturer Certificates of Analysis vs independent third-party COAs — what data is included, what is omitted, and why it matters for compounding pharmacies and research labs.
Independent testing considerations for MOTS-c — a 16-residue mitochondrial-derived peptide — including purity, identity confirmation, water content, and shelf stability.
ACS Laboratory operates peptide identity and purity testing under ASTM D8558 today and is helping shape the upcoming ASTM F49 standards for peptide therapeutics.
Which kinds of labs can test research peptides for purity, what a real purity test includes, how to spot a weak lab, and how to send a sample. Written by the analytical team at Peptide Testing Labs.
ACS Peptide Testing Labs now offers quantitative endotoxin testing via LAL assay per USP <85>. Learn why endotoxin screening is critical for injectable peptides, compounding pharmacies, and research applications.
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