#hplc
4 pieces tagged hplc.
- Reading the paperworkWhy two laboratories get different numbers on the same lotAn HPLC purity figure is a method-dependent number. Where the differences between two reports on one lot come from, what measurement uncertainty is, and how to tell an expected gap from a real discrepancy.
- Reading the paperworkSeven ways a certificate of analysis misleadsRepresentative certificates, lot numbers that match nothing, in-house tests dressed as independent, purity without identity, stale dates and purity without net content: each pattern, and what a good certificate shows instead.
- Sourcing and provenancePeptide purity grades, salt exchange and modificationsThe grade ladder from crude to 98 per cent and what each is used for, what a salt exchange adds to price and lead time, and the modifications a custom order can specify.
- Reading the paperworkChecking a peptide lab report: lookups, registers and ISO 17025A step-by-step way to check that a laboratory report is genuine, is about the sample it claims, and comes from a lab whose competence can be confirmed in a register the lab does not control.
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