tfa or acetate, how do i tell from the paperwork
#coa-reading 2026-04-19
Sunday14 messages5 participantstimes are UTC
Highlights from this day
- retention_time — purity is what fraction of the contents is the target. assay is how many mg are actually there. different questions 16:03
- net_peptide — net peptide is gross mass minus water minus counterion. that is why 11.4mg of powder can be a correct 10mg vial i have never seen a research certificate with an… 17:07
- split_shipment — a supplier certificate on its own is a starting point, not evidence. that is the whole reason the verification channel exists 18:09
- retention_time — retention time shifts between runs are normal. relative retention time is the number to compare, n of 1 obviously 18:15
is there a standard layout or does every lab do their own
purity is what fraction of the contents is the target. assay is how many mg are actually there. different questions
net not gross
one decimal versus two is usually just house style, not precision
thats a real table
net peptide is gross mass minus water minus counterion. that is why 11.4mg of powder can be a correct 10mg vial
i have never seen a research certificate with an endotoxin result on it. not once
not evidence on its own
if the certificate date precedes the lot date, ask. sometimes it is sloppiness and sometimes it is not
a supplier certificate on its own is a starting point, not evidence. that is the whole reason the verification channel exists
ok so no lot number, no certificate. a document you cannot tie to the vial in your hand is decoration
sorry to jump in certificate is dated before the lot date, is that just sloppiness
purity is not assay
✅12🧪1
retention time shifts between runs are normal. relative retention time is the number to compare, n of 1 obviously