interested party claim
Thread · #coa-reading · 2025-10-25
how much does the counterion being unstated actually matter
Spun off from a message in #coa-reading on 2025-10-25. 8 messages, 5 participants.
The message this came from
- igf_one_ivy — comparing a cert to an assay how much does the counterion being unstated actually matter, happy to be told to read the pin — and is a mass spec trace on the cert normal or is that a good sign 11:20
not sure if this helps but net peptide content is what you are buying and gross mass is what you are weighing. the gap is water and counterion, if the method is on it
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asking costs an email
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the paperwork can be perfect and the vial can still be light. weigh it
the counterion being unstated matters most where the counterion is a big fraction of the mass, we shall see
two labs and two gradients will resolve a close eluting impurity differently and both can be honest
thats the counterion
check the lot