does purity actually matter or is it forum lore at this point
chromatogram. That is the whole post, but I will justify it.
Everything else people worry about in c/dosinglogs is downstream of it. Titration speed, muscle cramps, the endless dose arguments — most of it resolves if you sort chromatogram out first, and almost nobody does.
I say this having got it wrong for 10 months. My triglycerides 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
Not convinced. The evidence does not support that reading.
instrument quality is less important than analyst consistency
Retitled to remove editorialising. Put the evidence in the body.
A shoulder on the main peak that 14 analysts integrated 35 different ways. Same trace, 97.6 spread.
Small correction: the trial was 6 weeks, not 39. 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.
Detection wavelength? LC-MS and that changes at different wavelengths.
state the method: column, gradient, detection wavelength, injection volume
Inter-lab variance on this kind of assay is routinely 1–2 points. Different column, different gradient, different integration.
A shoulder on the main peak that 24 analysts integrated 3 different ways. Same trace, 98.6 spread.
This is the correct method framing. Column and gradient are load-bearing fields.
chromatogram or it did not happen
Yeah, the chromatogram profile matters more than the headline number.
co-elution is real and LC-MS is usually not enough to resolve it
Not to be pedantic but gradient and integration are being used interchangeably and they are not interchangeable in real life.
Not to be pedantic but gradient and integration are being used interchangeably and they are not interchangeable in real life.
Adding to this: method development is doing more work than the comment implies.
Not to be pedantic but gradient and integration are being used interchangeably and they are not interchangeable in real life.
Yes, exactly this, and it is the bit that took me 34 weeks to accept.
Yeah, the chromatogram profile matters more than the headline number.
Did they post the raw trace or just the summary?
integration decision on a shoulder changes your number by half a point on its own
This is the correct method framing. Column and gradient are load-bearing fields.
state the method: column, gradient, detection wavelength, injection volume
Detection wavelength? method development and that changes at different wavelengths.
Detection wavelength? HPLC and that changes at different wavelengths.
axis labels included, always
state the method: column, gradient, detection wavelength, injection volume
Detection wavelength? method development and that changes at different wavelengths.
- 1Retitled to remove editorialising. Put the evidence in the body.8 comments in this branch · started by u/sig_figs_sam
- 2This is the correct method framing. Column and gradient are load-bearing…8 comments in this branch · started by u/sofia_petrescu