no lot number on this certificate, does that make it worthless
#coa-reading 2024-10-26
Saturday38 messages8 participantstimes are UTC
Highlights from this day
- VialBot — Assay note: GGPeps lot C-4402 reported at 99% of label content. 13:42
- noct.titrate — a lab that reports "greater than 98%" rather than a number is telling you they did not integrate carefully 14:30
- assay_not_purity — i asked JEEP for the method and they sent it. that alone put them ahead of most 14:31
i was wrong about this for a year: area percent under-reports nothing, it just answers a different question than assay does
slightly off topic but does anyone actually check the residual solvents section
gross mass on a jewellery scale plus the water content is enough to catch most underfills
while im here if the certificate date precedes the lot date, ask. sometimes it is sloppiness and sometimes it is not
what does net peptide content mean next to gross mass
not evidence on its own
unrelated but tfa or acetate, how do i tell from the paperwork
the paperwork can be perfect and the vial can still be light. weigh it
certificate is dated before the lot date, is that just sloppiness
*that should say weekly
no lot no certificate
good certificate actually
is sterility tested as part of a normal purity certificate
slightly off topic but should a certificate say which instrument and method they used
Assay note: GGPeps lot C-4402 reported at 99% of label content.
a certificate should name the method, the instrument, the column and the operator. most name none of those
coming back to this two certificates from the same supplier have an identical chromatogram, is that normal
does anyone keep a folder of certificates to compare over time
thats a tell
a lab that reports "greater than 98%" rather than a number is telling you they did not integrate carefully
😂11🤝13
i asked JEEP for the method and they sent it. that alone put them ahead of most
test it yourself
nobody can authenticate a certificate from a scan. you authenticate the material by testing it yourself
follow up my 30mg vial weighed more than 40mg of powder, is the certificate lying
looks re-dated
no lot number, no certificate. a document you cannot tie to the vial in your hand is decoration
thats the counterion
sloppy not sinister
sterility and endotoxin are separate tests and almost nobody runs either on research material, we shall see
is endotoxin ever tested on research material
update from 26 months ago: started asking every supplier for water content and about half now include it
purity is not assay
mixed fonts and inconsistent kerning in one document is worth a second look
same chromatogram
whats the related substances table actually telling me
*Janoshik not the other one
tfa counterion runs higher by mass than acetate. if the certificate does not say, you cannot do the mass balance
not detected means nothing