tfa counterion runs higher by mass than acetate. if the certificate does not say, you cannot do the mass balance
#coa-reading 2024-11-13
Wednesday13 messages4 participantstimes are UTC
Highlights from this day
- cold_chain_cmdr — if you only read one line on a certificate, read the lot number. if you read two, read the assay, still working it out 20:29
- cold_chain_cmdr — purity is what fraction of the contents is the target. assay is how many mg are actually there. different questions 20:52
- assay_not_purity — slightly off topic but i was wrong about this for a year: area percent under-reports nothing, it just answers a different question than assay does if you only read… 21:51
- thirty_min_wait — a certificate should name the method, the instrument, the column and the operator. most name none of those, i think 21:55
the font on this one changes halfway down, am i being paranoid
if you only read one line on a certificate, read the lot number. if you read two, read the assay, still working it out
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if the certificate date precedes the lot date, ask. sometimes it is sloppiness and sometimes it is not
purity is what fraction of the contents is the target. assay is how many mg are actually there. different questions
should a certificate say which instrument and method they used
retention time shifts between runs are normal. relative retention time is the number to compare
same chromatogram
[edited]net not gross
slightly off topic but i was wrong about this for a year: area percent under-reports nothing, it just answers a different question than assay does
if you only read one line on a certificate, read the lot number. if you read two, read the assay
i have never seen a research certificate with an endotoxin result on it. not once
no lot no certificate
[edited]a certificate should name the method, the instrument, the column and the operator. most name none of those, i think