How to Read a Peptide Certificate of Analysis
A certificate of analysis is the only document that connects a vial in your hand to an actual measurement. It is also the document most often padded, reused across batches, or quietly produced in-house. This note sets out what a usable certificate contains, how to read one, and which absences should stop a purchase. The […]
HPLC vs Mass Spectrometry: What Each Test Actually Proves
Suppliers tend to list HPLC and mass spectrometry side by side as though they are two ways of saying the same thing. They are not. They answer different questions, and a certificate that carries only one of them leaves a specific gap. This note explains what each method actually establishes and why serious catalogues report […]
Reconstitution and Storage of Lyophilised Research Compounds
A lot that tests at 99% purity on arrival can be materially degraded a fortnight later if it is handled carelessly. Stability is a property of the whole chain — transit, storage, reconstitution, and the container the material ends up in — not just of the synthesis. This note covers laboratory handling of lyophilised research […]