Category · Quality
Quality & HPLC Testing
Purity is the foundation of a valid study. Learn how HPLC and mass spec verify what's in the vial — and why suppliers like PeptidesUK4U publish batch-specific CoAs.
HPLC & Certificate of Analysis — Master Guide
The complete pillar guide: how HPLC works, reading a chromatogram, mass spec identity confirmation, anatomy of a CoA and purity tiers.
ReadReading a Chromatogram
Retention time, peak area, main-peak percentage, resolution — what every line on the trace actually means.
ReadMass Spectrometry Identity
Why HPLC alone is insufficient. How MS confirms molecular weight and identity to complement purity.
ReadAnatomy of a CoA
Batch number, test methods, purity %, water content, residual solvents, endotoxin — every field on a Certificate of Analysis.
ReadPurity Tiers: What ≥98% Actually Means
Research-grade vs pharmaceutical-grade, why <95% is a red flag, and how impurities affect study outcomes.
ReadSupplier Verification Checklist
Batch-specific CoAs, third-party testing, chain of custody. What separates a credible supplier from a repackager.
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