Glossary · 2026-09-24
Scientific lead: Alice Kay, Ph.D.
Analytical specification versus a lot file
An analytical specification is a written limit for a named test: a method, a unit, and a bound. A single percentage on a website is not that document. This catalogue does not publish one house limit that replaces the Certificate of Analysis for every peptide and every method. The lot file remains the record for the vial you received.
The FAQ states a replacement condition for one lot: if that lot's Certificate of Analysis, or an independent test of an unopened vial from that same lot, shows an identity mismatch or a purity figure below the figure printed on that lot's COA, the vial is replaced and the original payment is refunded. That sentence is a catalogue remedy for the lot. It is not a sitewide purity guarantee, it is not a chromatographic method, and it does not fill a blank line on a PDF. Read the policy on the independent-testing FAQ and the file in the certificates library. Research use only.
Frequently asked questions
- Is the independent-testing FAQ a universal test method?
- No. It is a replacement condition for one lot, stated on the FAQ. The method and the figures still come from the report you are reading.
- Does a missing purity line fail a specification by itself?
- A missing line is a missing line. The value was not reported. Ask the lot file, not a glossary entry, what was measured.
Research use only. BlueNex Labs does not provide medical or veterinary advice. Confirm your institution’s policies before purchase. How a comparison or class note is checked sits on documentation standards. The biochemist of record is Alice Kay, Ph.D.