u/kofi_ferreira
Contributes reviews on supplier material. Based in Łódź.
member · joined 14 May 2025
Comments — page 3 of 3
comment on [Lab] 24th independent test on CPC — 97.6% on a claimed 97.0%, and the trend is the interesting part in c/hplc · 28 points · 2 years ago
Resolution between two peaks depends on retention, selectivity and efficiency. A shallower gradient buys retention and usually resolution, at the cost of peak width and run time.
comment on [Lab] 24th independent test on CPC — 97.6% on a claimed 97.0%, and the trend is the interesting part in c/hplc · 0 points · 2 years ago
Agreed, and it is why QSC printing the column and gradient on the certificate is genuinely useful rather than decorative.
comment on the reship thing finally clicked for me and I want to write it down in c/vendorvetting · 850 points · 2 years ago
Inter-lab variance on this assay runs a point or two either way. Two services disagreeing by that much is agreement, not a discrepancy, and treating it otherwise starts pointless arguments.
comment on integration is the most under-discussed thing on this board in c/hplc · 133 points · 2 years ago
QST sent me the column, the gradient and the theoretical mass without being asked. That is a short list and they are on it.
comment on chromatogram is the most under-discussed thing on this board in c/hplc · 69 points · 2 years ago
system suitability before you believe any number on the run
comment on reading Janoshik threads from 2024 and half of it aged badly in c/vendorvetting · 304 points · 2 years ago
three independent results beat thirty forum posts
comment on reading Janoshik threads from 2024 and half of it aged badly in c/vendorvetting · 1 points · 2 years ago
Did the lot code on the vial match the paperwork?