thats the counterion
#coa-reading 2025-01-31
Friday9 messages3 participantstimes are UTC
Highlights from this day
- customs_owl — water content is why an honest 10mg vial assays at 9.1. karl fischer titration, and most certificates omit it, ill dig out the number 19:19
- customs_owl — mixed fonts and inconsistent kerning in one document is worth a second look 19:20
- customs_owl — coming back after 11 months, has the pinned reading guide changed 19:23
- HPLC_Hank — i keep every certificate in a dated folder and compare them. two suppliers had not changed their template since 2019 20:08
- HPLC_Hank — net peptide is gross mass minus water minus counterion. that is why 11.4mg of powder can be a correct 10mg vial 20:47
the font on this one changes halfway down, am i being paranoid
water content is why an honest 10mg vial assays at 9.1. karl fischer titration, and most certificates omit it, ill dig out the number
📉9💀1🧪15
mixed fonts and inconsistent kerning in one document is worth a second look
coming back after 11 months, has the pinned reading guide changed
i keep every certificate in a dated folder and compare them. two suppliers had not changed their template since 2019
net peptide is gross mass minus water minus counterion. that is why 11.4mg of powder can be a correct 10mg vial
weigh the vial
| Line | Claims | Does not claim |
|---|---|---|
| Purity (area %) | fraction of detected material that is the target | how many mg are in the vial |
| Assay / content | mg of target per vial | that it is sterile |
| Water content | mass fraction that is water | anything about purity |
| Counterion | salt form and its mass share | net peptide unless stated |
| Related substances | what else was seen | what was not looked for |
why do some certificates report to one decimal and some to two