not detected means nothing
#coa-reading 2025-11-17
Monday22 messages5 participantstimes are UTC
Highlights from this day
- assay_not_purity — genuine question single wavelength detection can miss a co-eluting impurity that does not absorb there 16:51
- patent_2026 — update from 12 months ago: started asking every supplier for water content and about half now include it, i have it written down somewhere 16:56
- assay_not_purity — one decimal versus two is usually just house style, not precision, someone check my working 16:58
- assay_not_purity — is there a standard layout or does every lab do their own 17:16
- power_through_no — genuine question i asked KP for the method and they sent it. that alone put them ahead of most 18:04
i have never seen a research certificate with an endotoxin result on it. not once
does anyone actually check the residual solvents section
is sterility tested as part of a normal purity certificate
the honest summary is that a certificate tells you what the supplier says about a lot they chose to test
is endotoxin ever tested on research material
why would a vial be 96.8 pure and still assay under label
genuine question single wavelength detection can miss a co-eluting impurity that does not absorb there
[edited]peptidemeter-summary-g-0641.pdf
2 pages · 568 KB · not retained in the public archive
is a supplier certificate worth anything on its own
update from 12 months ago: started asking every supplier for water content and about half now include it, i have it written down somewhere
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one decimal versus two is usually just house style, not precision, someone check my working
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same chromatogram
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does purity by hplc at one wavelength miss things
thats a tell
is there a standard layout or does every lab do their own
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no lot number on this certificate, does that make it worthless
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water content is why an honest 10mg vial assays at 9.1. karl fischer titration, and most certificates omit it
purity is not assay
how do you verify a certificate is actually from the lab it says
sterility and endotoxin are separate tests and almost nobody runs either on research material
whats the minimum a certificate has to have before you take it seriously
genuine question i asked KP for the method and they sent it. that alone put them ahead of most
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