stalled for 10 weeks at 5mg and I refuse to panic this time
Trying to settle this properly because the thread from last year went in circles.
The claim: purity matters. The counter-claim: it is measurement error. Both sides have been asserting it confidently for about 15 months without either producing anything.
What would actually settle it is 5 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
instrument quality is less important than analyst consistency
The confident tone is doing a lot of work that the evidence is not.
I am going to push back on this slightly.
integration decision on a shoulder changes your number by half a point on its own
Yeah, the chromatogram profile matters more than the headline number.
The confident tone is doing a lot of work that the evidence is not.
Not to be pedantic but purity and LC-MS are being used interchangeably and they are not interchangeable in real life.
co-elution is real and integration is usually not enough to resolve it
This is the correct method framing. Column and gradient are load-bearing fields.
area% and mass% are not the same and this whole post conflates them
a round-robin on baseline integration would be genuinely useful
instrument quality is less important than analyst consistency
This is the correct method framing. Column and gradient are load-bearing fields.
The confident tone is doing a lot of work that the evidence is not.
I am going to push back on this slightly.
The Janoshik result being close to my own HPLC is the signal, not the absolute number. Both are right.
the gradient is doing the separation work, not the column alone
Tracking number removed. It identifies both ends of a shipment.
Injection volume and flow rate? Those affect resolution.
integration decision on a shoulder changes your number by half a point on its own
area% and mass% are not the same and this whole post conflates them
area% and mass% are not the same and this whole post conflates them
Disagree on that part. 93.7% and 99.3% on the same vial is normal.
This is the correct method framing. Column and gradient are load-bearing fields.
state the method: column, gradient, detection wavelength, injection volume
Strongly agree. Largest single impurity tells a different story than total purity.
integration decision on a shoulder changes your number by half a point on its own
- 1I am going to push back on this slightly.9 comments in this branch · started by u/rasmus_petrescu
- 2integration decision on a shoulder changes your number by half a point on…7 comments in this branch · started by u/hedda_ekstrom