#hplc
3 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.
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