[Lab] 24th independent test on QSC, and the trend is the interesting part
gradient. That is the whole post, but I will justify it.
Everything else people worry about in c/dosinglogs is downstream of it. Titration speed, reflux, the endless dose arguments — most of it resolves if you sort gradient out first, and almost nobody does.
I say this having got it wrong for 14 months. My ApoB was the thing that eventually made me pay attention, which is a stupid way to learn a lesson that was in the sidebar the whole time.
best — the order this archive was captured in
Detection wavelength? method development and that changes at different wavelengths.
Small correction: the trial was 3 weeks, not 12. Does not change your point but people will quote it.
Ran the same vial on two columns, different purity, both right, different separation. Method matters more than equipment.
Retitled to remove editorialising. Put the evidence in the body.
Dead space in the needle hub holds a small but non-trivial volume. On low-volume draws that can be several units.
two labs, two different baselines, two different purity numbers, both honest
state the method: column, gradient, detection wavelength, injection volume
i do not know.
Disagree on that part. 98.1% and 97.6% on the same vial is normal.
i do not know.
Adding to this: HPLC is doing more work than the comment implies.
state the method: column, gradient, detection wavelength, injection volume
Strongly agree. Largest single impurity tells a different story than total purity.
co-elution is real and integration is usually not enough to resolve it
two labs, two different baselines, two different purity numbers, both honest
Small correction: the trial was 20 weeks, not 36. Does not change your point but people will quote it.
Did they post the raw trace or just the summary?
a round-robin on baseline integration would be genuinely useful
Disagree. What you are describing is consistent with purity, not with what you concluded.
area% and mass% are not the same and this whole post conflates them
This is the "correlation is mechanism" thing again. You changed three variables at once.
This is the correct method framing. Column and gradient are load-bearing fields.
A shoulder on the main peak that 5 analysts integrated 28 different ways. Same trace, 98.1 spread.
- 1i do not know. that is the honest answer.12 comments in this branch · started by u/b12_baseline
- 2source?5 comments in this branch · started by u/ignacio_vanhecke