the honest summary is that a certificate tells you what the supplier says about a lot they chose to test
#coa-reading 2025-01-13
Monday19 messages6 participantstimes are UTC
Highlights from this day
- cold_chain_cmdr — whats the related substances table actually telling me 17:30
- retention_time — does anyone keep a folder of certificates to compare over time 19:02
- retention_time — my 40mg vial weighed more than 15mg of powder, is the certificate lying 19:11
- retention_time — two certificates from the same supplier have an identical chromatogram, is that normal 19:24
same chromatogram
whats the related substances table actually telling me
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test it yourself
if the certificate date precedes the lot date, ask. sometimes it is sloppiness and sometimes it is not
if you only read one line on a certificate, read the lot number. if you read two, read the assay
update on the earlier thing a lab that reports "greater than 98%" rather than a number is telling you they did not integrate carefully
18:00marrow.mod pinned a message to this channel
sorry to jump in single wavelength detection can miss a co-eluting impurity that does not absorb there
one decimal versus two is usually just house style, not precision, anyway
is sterility tested as part of a normal purity certificate
mixed fonts and inconsistent kerning in one document is worth a second look
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ask for water content
if you only read one line on a certificate, read the lot number. if you read two, read the assay
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does anyone keep a folder of certificates to compare over time
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why do some certificates report to one decimal and some to two
genuine question what does net peptide content mean next to gross mass
Digest for the week of 2024-06-14 has been published.
the paperwork can be perfect and the vial can still be light. weigh it
my 40mg vial weighed more than 15mg of powder, is the certificate lying
lot bought purity assay/label
A-2418 2025-03 99.1% 9.6 / 10mg
A-2601 2025-08 98.7% 9.8 / 10mg
B-0114 2026-01 99.3% 9.4 / 10mg
B-0329 2026-04 98.9% 9.9 / 10mg🧊6
two certificates from the same supplier have an identical chromatogram, is that normal
lot bought purity assay/label
A-2418 2025-03 99.1% 9.6 / 10mg
A-2601 2025-08 98.7% 9.8 / 10mg
B-0114 2026-01 99.3% 9.4 / 10mg
B-0329 2026-04 98.9% 9.9 / 10mg🧪4