#coa-reading 2025-09-26

Friday15 messages5 participantstimes are UTC

Highlights from this day

motivation_gone — two certificates from the same supplier have an identical chromatogram, is that normal 11:24
void_volume — a lab that reports "greater than 98%" rather than a number is telling you they did not integrate carefully 11:27
logrotate — tfa counterion runs higher by mass than acetate. if the certificate does not say, you cannot do the mass balance 11:47
subq_sy — why would a vial be 96.8 pure and still assay under label 12:13
logrotate — i have never seen a research certificate with an endotoxin result on it. not once 12:30

two certificates from the same supplier have an identical chromatogram, is that normal

peak   RRT    area%    note
  1   0.42     0.31    solvent front
  2   0.88     0.44    related substance
  3   1.00    98.72    main
  4   1.14     0.53    related substance

rotterdam_recon 11:26

does anyone actually check the residual solvents section

void_volumelab11:27

a lab that reports "greater than 98%" rather than a number is telling you they did not integrate carefully

is area percent the same thing as how many mg are in the vial

ask for water content

motivation_gone 11:32

thats a real table

motivation_gone 11:43

thats a tell

motivation_gone two certificates from the same supplier have an identical chromatogram, is that normal

logrotatearchive11:47