net peptide is gross mass minus water minus counterion. that is why 11.4mg of powder can be a correct 10mg vial
#coa-reading 2025-12-16
Tuesday18 messages6 participantstimes are UTC
Highlights from this day
- underfill_uma — net peptide is gross mass minus water minus counterion. that is why 11.4mg of powder can be a correct 10mg vial 19:04
- VialBot — Purity check: no report on file for lot H-2814. Nothing logged either way. 19:42
- chaser_chris — water content is why an honest 10mg vial assays at 9.1. karl fischer titration, and most certificates omit it 21:30
single wavelength detection can miss a co-eluting impurity that does not absorb there
a certificate should name the method, the instrument, the column and the operator. most name none of those
whats the related substances table actually telling me
coming back after 23 months, has the pinned reading guide changed
the paperwork can be perfect and the vial can still be light. weigh it, i have it written down somewhere
what does net peptide content mean next to gross mass
Purity check: no report on file for lot H-2814. Nothing logged either way.
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thats a tell
net not gross
not evidence on its own
one decimal versus two is usually just house style, not precision, i think
thats the counterion
sloppy not sinister
looks re-dated
water content is why an honest 10mg vial assays at 9.1. karl fischer titration, and most certificates omit it
vial-h-2814-front.png
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gross mass on a jewellery scale plus the water content is enough to catch most underfills
thats a real table