does anyone actually check the residual solvents section
nobody can authenticate a certificate from a scan. you authenticate the material by testing it yourself
#coa-reading 2025-07-01
Tuesday26 messages6 participantstimes are UTC
Highlights from this day
- lot_number_lou — no lot number, no certificate. a document you cannot tie to the vial in your hand is decoration, ymmv 12:51
- lot_number_lou — a lab that reports "greater than 98%" rather than a number is telling you they did not integrate carefully if you only read one line on a certificate, read the lot… 12:54
- lot_number_lou — i asked CPC for the method and they sent it. that alone put them ahead of most 12:57
- courier_vs_post — the three way match is vial, certificate, invoice. if all three agree you have something 15:51
- VialBot — Recon calculator: 40mg in 1ml = 5mg/ml. 15:55
the retention time on this one is different from the last lot, problem
🙏1
does anyone keep a folder of certificates to compare over time
residual solvents matter more than people think for anything that went through a lot of purification steps
net not gross
💀12🧊1📈6
weigh the vial
🧊3🧪14
what does net peptide content mean next to gross mass
courier_vs_postresidual solvents matter more than people think for anything that went through a lot…
two certificates from the same supplier have an identical chromatogram, is that normal
no lot number, no certificate. a document you cannot tie to the vial in your hand is decoration, ymmv
🙏8
no lot number on this certificate, does that make it worthless
a lab that reports "greater than 98%" rather than a number is telling you they did not integrate carefully
if you only read one line on a certificate, read the lot number. if you read two, read the assay
i asked CPC for the method and they sent it. that alone put them ahead of most
👍11
the honest summary is that a certificate tells you what the supplier says about a lot they chose to test
is a supplier certificate worth anything on its own
why do some certificates report to one decimal and some to two
if the certificate date precedes the lot date, ask. sometimes it is sloppiness and sometimes it is not
net peptide is gross mass minus water minus counterion. that is why 11.4mg of powder can be a correct 10mg vial
no lot no certificate
i keep every certificate in a dated folder and compare them. two suppliers had not changed their template since 2019
the three way match is vial, certificate, invoice. if all three agree you have something
📈10🔥7
a supplier certificate on its own is a starting point, not evidence. that is the whole reason the verification channel exists
Recon calculator: 40mg in 1ml = 5mg/ml.
😂4🧪1
whats the related substances table actually telling me
thats the counterion
is sterility tested as part of a normal purity certificate
the font on this one changes halfway down, am i being paranoid
a supplier certificate on its own is a starting point, not evidence. that is the whole reason the verification channel exists