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Quality & Testing
Articles on the analytical side of peptide research: what HPLC and mass spectrometry each establish, how to read a certificate of analysis, and how to evaluate a supplier's documentation.
Lab Quality & Testing
How to Read a Peptide COA: A Complete Walkthrough
A certificate of analysis is only useful if you can interrogate it. Here is what each section should contain and which omissions should stop an order.
August 25, 2026 · 8 min read
Lab Quality & Testing
HPLC vs Mass Spectrometry: Two Questions, Two Instruments
HPLC separation and mass spectrometry provide complementary evidence, with distinct limits. Learn what each method can and cannot establish.
August 23, 2026 · 6 min read
Lab Quality & Testing
LC-MS: Confirming Peptide Identity in One Run
Coupling chromatography to a mass spectrometer answers separation and identity questions simultaneously — and catches co-eluting impurities a UV trace hides.
August 21, 2026 · 5 min read
Lab Quality & Testing
Net Peptide Content vs Purity Percent
The two numbers most often confused on a certificate — and the reason your actual concentration may be lower than your calculation assumes.
August 19, 2026 · 5 min read
Lab Quality & Testing
Endotoxin and Sterility Testing Explained
LAL, rFC and USP <71> answer different questions. Sterility is about live organisms; endotoxin is about what dead ones leave behind.
August 17, 2026 · 6 min read
Lab Quality & Testing
Research Peptide Quality Standards: What Good Looks Like
A practical specification for evaluating a supplier: documentation, testing scope, traceability and consistency across lots.
August 15, 2026 · 6 min read
Lab Quality & Testing
Why Third-Party Testing Matters
In-house data can be excellent and still be unverifiable. Independent testing removes the incentive problem entirely.
August 13, 2026 · 5 min read
Lab Quality & Testing
How to Spot a Grey-Market Peptide Vendor
Eight signals that separate a documented research supplier from a reseller repackaging unknown material.
August 11, 2026 · 6 min read
Lab Quality & Testing
What Research Use Only Actually Means
The label is a regulatory classification with real consequences, not a formality or a disclaimer for show.
August 9, 2026 · 5 min read
Lab Quality & Testing
Why Domestic Manufacturing Matters for Research Peptides
Shorter supply chains mean fewer temperature excursions, faster documentation and traceability that can actually be audited.
August 7, 2026 · 5 min read
Lab Quality & Testing
Solid-Phase Peptide Synthesis, Explained
How a peptide is actually built, one residue at a time, on an insoluble resin — and why the impurities on your COA look the way they do.
August 5, 2026 · 7 min read