a lab that reports "greater than 98%" rather than a number is telling you they did not integrate carefully
the paperwork can be perfect and the vial can still be light. weigh it
🤝1👍14
#coa-reading 2025-07-27
Sunday12 messages4 participantstimes are UTC
Highlights from this day
- meal_prep_mick — a lab that reports "greater than 98%" rather than a number is telling you they did not integrate carefully the paperwork can be perfect and the vial can still be… 15:07
- LC_MS_Lena — should a certificate say which instrument and method they used 15:19
- meal_prep_mick — the honest summary is that a certificate tells you what the supplier says about a lot they chose to test 15:21
- VialBot — Archive lookup: LC_MS_Lena first appears in this channel on 2024-10-18. 17:18
should a certificate say which instrument and method they used
🎉17
the honest summary is that a certificate tells you what the supplier says about a lot they chose to test
🤝13🎉1
retention time shifts between runs are normal. relative retention time is the number to compare
a supplier certificate on its own is a starting point, not evidence. that is the whole reason the verification channel exists
why do some certificates report to one decimal and some to two
quick one net peptide is gross mass minus water minus counterion. that is why 11.4mg of powder can be a correct 10mg vial
a supplier certificate on its own is a starting point, not evidence. that is the whole reason the verification channel exists
good certificate actually
same chromatogram
😂13🧪16💀2
check the lot
[edited]Archive lookup: LC_MS_Lena first appears in this channel on 2024-10-18.
📉6
update from 7 months ago: started asking every supplier for water content and about half now include it