c/coa · created 18 Aug 2023
Certificates of analysis, decoded. Post the whole document, not the headline number.
I have typed some version of this comment about four hundred times so it is going in one place. Area% is the main peak as a fraction of total UV absorbance across all…
Following on from the area% thread, because the same confusion turns up in a second form. People read a 10mg vial at 99% purity and conclude they have 9.9mg of peptide.…
FGP cagrilintide. The document has a compound name, a purity figure, a logo, and a signature image. No batch number. No date of analysis. No method beyond the word…
Short answer, for anyone who finds this from a search: no. Longer version. A COA from an actual laboratory is exported from instrument software or from a LIMS. The PDF…
Reference standards, analytical reagents and system-suitability material. If you are running your own method, start with a known.
Reference standardsRan these on the same day, same method, same column, injections back to back. One is GL Biochem raw material, one is a reseller vial of nominally the same compound and…
CPC semaglutide 10mg. COA says 96.8%, method line says "HPLC", batch and date both present. Nothing cropped, whole page. Everyone in here talks about 98 and 99 like…
I have had 21 orders now and I keep a table, so here is the honest summary rather than a vibe. Material has been consistent. Communication has not. Shipping has varied…
How to read a certificate of analysis and what it does and does not tell you. Area% versus mass%, identity versus quantity, water content, related substances, acetate counterions, and the difference between a vendor-supplied COA and an independent test on the vial you actually received.
Certified reference materials for peptide identity and purity work.
sigmaaldrich.comSeveral compounds discussed on GLP Research Hub are sold for research use only and are not approved for human use anywhere. Nothing here is medical advice and none of it is written by your clinician. If a post reads like an instruction, treat it as a description of what one stranger did.
Reference