Peptide testing, explained by the people who run the assays
No marketing copy. The technical background that makes a certificate useful rather than decorative.
- Articles
- 17
- Guides
- 4
- Topics
- 5
Start with a complete guide
Interpreting Results
How to read a Certificate of Analysis, what each number means, and the errors that make a good report look like a bad one.
- 7 min
Purity Versus Net Peptide Content
Why a 99% pure sample can contain far less peptide than its label claims, and where the missing mass actually goes.
- 7 min
Reading the Chromatogram Behind Your Result
Peak shape, baseline drift and shoulders: what the raw trace shows that a purity percentage cannot.
- 5 min
What 'Not Detected' Means on a Lab Report
Why 'not detected' never means zero, and what a certificate must state for the result to mean anything.
Analytical Methods
The instrumentation behind each result: chromatography, mass spectrometry, elemental analysis and microbiology, explained without hand-waving.
- 7 min
Bacterial Endotoxin Testing Explained
How the LAL assay quantifies endotoxin burden, what EU per milligram means, and why the test needs its own vial.
- 7 min
ICP-MS Heavy Metal Testing for Peptides
How ICP-MS quantifies elemental impurities to sub-ppb limits, and where the contamination usually originates.
- 7 min
LC-MS Identity Confirmation for Peptides
How mass spectrometry confirms identity, what ppm accuracy means, and the one thing a mass match cannot tell you.
- 6 min
Residual Solvent Testing for Peptides
Which solvents survive synthesis and purification, how headspace GC detects them, and why drying does not remove everything.
- 8 min
RP-HPLC Purity Testing for Peptides
How reverse-phase HPLC measures purity, what the percentage actually represents, and why the detection wavelength changes the answer.
- 7 min
Sterility Testing Under USP <71>
How membrane filtration sterility testing works, why it takes fourteen days, and what the result actually covers.
Certificate Verification
How certificate verification works, why a document alone proves nothing, and how to detect an altered or fabricated report.
Submission Guidance
Planning a submission: which assays answer which question, how many vials to send, and how to ship without losing weeks to customs.
- 6 min
Shipping Peptide Samples to a Laboratory
Packaging, temperature and the customs wording that decides whether your samples arrive next week or next month.
- 6 min
Why Sterility and Endotoxin Need Dedicated Vials
The chain-of-custody reason these assays cannot share material, and how to count vials before shipping.
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