nobody can authenticate a certificate from a scan. you authenticate the material by testing it yourself, i could be wrong
#coa-reading 2026-01-08
Thursday14 messages4 participantstimes are UTC
Highlights from this day
- LC_MS_Lena — nobody can authenticate a certificate from a scan. you authenticate the material by testing it yourself, i could be wrong 16:00
- LC_MS_Lena — the certificate from GL Biochem is the one i use to teach this because it actually has a populated impurity table 16:14
- LC_MS_Lena — the paperwork can be perfect and the vial can still be light. weigh it 16:15
- LC_MS_Lena — i keep every certificate in a dated folder and compare them. two suppliers had not changed their template since 2019 16:25
- LC_MS_Lena — the related substances table is the interesting part. a row of "not detected" means they did not look hard 17:11
no lot no certificate
the certificate from GL Biochem is the one i use to teach this because it actually has a populated impurity table
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the paperwork can be perfect and the vial can still be light. weigh it
is area percent the same thing as how many mg are in the vial
why would a vial be 97.4 pure and still assay under label
ask for water content
thats a tell
i keep every certificate in a dated folder and compare them. two suppliers had not changed their template since 2019
looks re-dated
not detected means nothing
same chromatogram
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weigh the vial
the related substances table is the interesting part. a row of "not detected" means they did not look hard
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