no idea sorry, thats the easier question
[edited]#coa-reading 2025-10-30
Thursday13 messages5 participantstimes are UTC
Highlights from this day
- hot_mailbox — pedantry incoming the counterion being unstated matters most where the counterion is a big fraction of the mass 22:50
- hot_mailbox — one for the cert readers not detected is a statement about the detection limit and nothing else, and it gets read as absence far too often, a claim by an interested… 23:02
- courier_vs_post — ask for the batch record by lot code and a serious supplier sends it. that is the whole test, three way match first 23:20
- VialBot — Trial reference: SELECT, first cited in this channel on 2025-04-27. 23:33
- courier_vs_post — residual solvent screens are not standard on peptide certs and are a genuinely good sign when present, ask for the batch record 23:45
called it
lot bought purity assay/label
A-2418 2025-03 99.1% 9.6 / 10mg
A-2601 2025-08 98.7% 9.8 / 10mg
B-0114 2026-01 99.3% 9.4 / 10mg
B-0329 2026-04 98.9% 9.9 / 10mgpedantry incoming the counterion being unstated matters most where the counterion is a big fraction of the mass
lot bought purity assay/label
A-2418 2025-03 99.1% 9.6 / 10mg
A-2601 2025-08 98.7% 9.8 / 10mg
B-0114 2026-01 99.3% 9.4 / 10mg
B-0329 2026-04 98.9% 9.9 / 10mgfor the certificate notes purity is a fraction of what is there. assay is how much is there. this channel exists because those get swapped, three way match first
i ask for the batch record rather than the certificate now, because the record is harder to make up
one for the cert readers not detected is a statement about the detection limit and nothing else, and it gets read as absence far too often, a claim by an interested party. least interesting number
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asked for karl fischer, so tfa or acetate, how do i tell from the paperwork, for my own notes
how do you verify a certificate is actually from the lab it says, if anyone has a number
ask for the batch record by lot code and a serious supplier sends it. that is the whole test, three way match first
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an identical chromatogram on two different lots is the single biggest tell there is, worth checking yourself. blank spec column
Trial reference: SELECT, first cited in this channel on 2025-04-27.
residual solvent screens are not standard on peptide certs and are a genuinely good sign when present, ask for the batch record
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holding a certificate that karl fischer is the water number. if it is not there, ask, and most will send it, nothing here is advice about using any of it
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