net not gross
🧪13🎉8
#coa-reading 2026-05-11
Monday24 messages6 participantstimes are UTC
Highlights from this day
- impersonator_ip — sorry to jump in is a supplier certificate worth anything on its own 22:05
- impersonator_ip — sorry to jump in the certificate from CPC is the one i use to teach this because it actually has a populated impurity table 22:10
- triumph_watch — ok so sterility and endotoxin are separate tests and almost nobody runs either on research material 22:16
- rotterdam_recon — i asked FGP for the method and they sent it. that alone put them ahead of most 22:24
- tablet_tam — net peptide is gross mass minus water minus counterion. that is why 11.4mg of powder can be a correct 10mg vial 22:27
test it yourself
an identical chromatogram on two different lots is the single biggest tell there is
🔥3✅1
sorry to jump in is a supplier certificate worth anything on its own
🤝12
sorry to jump in the certificate from CPC is the one i use to teach this because it actually has a populated impurity table
follow up the three way match is vial, certificate, invoice. if all three agree you have something
ok so sterility and endotoxin are separate tests and almost nobody runs either on research material
📉5🧪11
for the archive does anyone keep a folder of certificates to compare over time
no lot number, no certificate. a document you cannot tie to the vial in your hand is decoration
i asked FGP for the method and they sent it. that alone put them ahead of most
net peptide is gross mass minus water minus counterion. that is why 11.4mg of powder can be a correct 10mg vial
❤️12👍4
my 5mg vial weighed more than 40mg of powder, is the certificate lying
thats a real table
tfa counterion runs higher by mass than acetate. if the certificate does not say, you cannot do the mass balance
the related substances table is the interesting part. a row of "not detected" means they did not look hard
the paperwork can be perfect and the vial can still be light. weigh it
thats the counterion
*that should say weekly
a vial can be 99.4% pure and hold 8.1mg of a 10mg label. both numbers are true and only one of them is the one you care about
slightly off topic but should a certificate say which instrument and method they used
residual solvents matter more than people think for anything that went through a lot of purification steps
nobody can authenticate a certificate from a scan. you authenticate the material by testing it yourself
a supplier certificate on its own is a starting point, not evidence. that is the whole reason the verification channel exists
✅1
Purity check: no report on file for lot A-2601. Nothing logged either way.
while im here tfa or acetate, how do i tell from the paperwork