follow up tfa or acetate, how do i tell from the paperwork
#coa-reading 2026-02-01
Sunday18 messages5 participantstimes are UTC
Highlights from this day
- group_buy_gwen — purity is what fraction of the contents is the target. assay is how many mg are actually there. different questions 23:22
- VialBot — Reminder set. I will post here in 2 days. 23:30
- void_volume — nobody can authenticate a certificate from a scan. you authenticate the material by testing it yourself 23:36
- group_buy_gwen — the honest summary is that a certificate tells you what the supplier says about a lot they chose to test 23:40
- void_volume — slightly off topic but i asked QSC for the method and they sent it. that alone put them ahead of most 23:53
my 2mg vial weighed more than 20mg of powder, is the certificate lying
ask for water content
coming back after 2 months, has the pinned reading guide changed
good certificate actually
purity is what fraction of the contents is the target. assay is how many mg are actually there. different questions
no lot no certificate
why would a vial be 98.6 pure and still assay under label
Reminder set. I will post here in 2 days.
no lot number, no certificate. a document you cannot tie to the vial in your hand is decoration
nobody can authenticate a certificate from a scan. you authenticate the material by testing it yourself
sloppy not sinister
the honest summary is that a certificate tells you what the supplier says about a lot they chose to test
the retention time on this one is different from the last lot, problem
sterility and endotoxin are separate tests and almost nobody runs either on research material
same chromatogram
slightly off topic but i asked QSC for the method and they sent it. that alone put them ahead of most
does purity by hplc at one wavelength miss things