Short question, hopefully short answer. This is the sort of thing that never gets written down anywhere so I figured I’d ask.
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Watched three vendors rebrand under new names after bad results. Check domain registration dates.
RE ResearchRN ·
Reversed-phase HPLC with UV detection at 214nm is the standard here because the peptide bond absorbs there. If a vendor reports purity without stating the method or wavelength, the number is not comparable to anything.