Page 2 of 2 · 38 questions tagged mass-spec.
What I have: an HPLC purity test · aggregation · oral semaglutide. I want to know what the trade-off actually is rather than which option is fashionable. I would…
Details up front: +2 · 4731.3 Da. This should be a straightforward calculation and I keep getting two different answers. The numbers are arbitrary; the method is what…
Setup, so nobody has to ask: +3 · 3751.0 Da. The units are where I keep going wrong, so please be explicit about them. I have sanity-checked the order of magnitude…
Numbers first: +2 · 3751.0 Da. This should be a straightforward calculation and I keep getting two different answers. The numbers are arbitrary; the method is what I…
The case in front of me: a quantified content assay · fibrillation · dulaglutide. These are treated as interchangeable and I do not think they are. If both are…
I have the report as a PDF with the chromatogram on page two, so I can quote specifics. The comparison I want does not seem to exist anywhere in a form I can…
Concretely: +5 · 4731.3 Da. Please show the division. I want to check my own against yours. I would like the general form as well as the specific number, so I can…
Setup, so nobody has to ask: +3 · 4207.2 Da. The units are where I keep going wrong, so please be explicit about them. I have sanity-checked the order of magnitude…
The particulars: +4 · 4113.6 Da. I would like the arithmetic checked rather than the conclusion asserted. I have deliberately not used an online calculator because I…
The specifics, since they change the answer: +4 · 4813.5 Da. I would rather understand the derivation than memorise the outcome. Two people I asked gave two answers…
This matters because it predicts what a related molecule should do. These are treated as interchangeable and I do not think they are. If both are acceptable I would…
What I am working with: +3 · 4731.3 Da. The units are where I keep going wrong, so please be explicit about them. I have sanity-checked the order of magnitude and it…
Concretely: +5 · 3751.0 Da. I want the working, not the result — I need to be able to redo it with different numbers. I care about the precision as well as the value…
Conditions: a Karl Fischer water content test · deamidation · dulaglutide. I would like the axes of comparison first and the recommendation second. I have tried the…