retention time shifts between runs are normal. relative retention time is the number to compare
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Thread · #coa-reading · 2025-10-09
sorry to jump in the three way match is
Spun off from a message in #coa-reading on 2025-10-09. 10 messages, 5 participants.
The message this came from
- hair_month_four — sorry to jump in the three way match is vial, certificate, invoice. if all three agree you have something 22:47
the font on this one changes halfway down, am i being paranoid
a vial can be 99.4% pure and hold 8.1mg of a 10mg label. both numbers are true and only one of them is the one you care about
thats a tell
i have never seen a research certificate with an endotoxin result on it. not once
retention time shifts between runs are normal. relative retention time is the number to compare
same chromatogram
a supplier certificate on its own is a starting point, not evidence. that is the whole reason the verification channel exists
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tfa counterion runs higher by mass than acetate. if the certificate does not say, you cannot do the mass balance