tried HPLC for 20 weeks. here is what happened.
Trying to settle this properly because the thread from last year went in circles.
The claim: chromatogram matters. The counter-claim: it is measurement error. Both sides have been asserting it confidently for about 10 months without either producing anything.
What would actually settle it is 17 people measuring the same thing the same way. I have started; my numbers are below. They lean one way but not strongly enough for me to declare victory.
If you have data, post the data. If you have an opinion, flair it as an opinion.
best — the order this archive was captured in
Yeah, the chromatogram profile matters more than the headline number.
Flair changed to match the content. Read the sidebar before posting next time and we are square.
state the method: column, gradient, detection wavelength, injection volume
state the method: column, gradient, detection wavelength, injection volume
Counter-anecdote: opposite result, same dose. Which mostly tells us the variance is huge.
Titration speed is a side-effect dial far more than an efficacy dial.
The related substances profile is way more interesting than the main peak %. A 98% with 2 peaks is different from a 98% that is one 17% impurity.
This is the correct method framing. Column and gradient are load-bearing fields.
This is the correct method framing.
Disagree on that part. 98.4% and 98.3% on the same vial is normal.
Did they post the raw trace or just the summary?
related substances are where the story lives, not the main peak
a round-robin on baseline integration would be genuinely useful
Gradient goblin mode: changed the solvent composition 4 times, finally got good resolution on a chromatogram peak.
- 1The related substances profile is way more interesting than the main peak %.…6 comments in this branch · started by u/micro_bump_mick
- 2Yeah, the chromatogram profile matters more than the headline number.5 comments in this branch · started by u/rania_okonkwo