Page 4 of 8 · 179 questions tagged reference-standard.
The specifics, since they change the answer: 98.4% · PeptideMeter · 98.2% · PeptideMeter. The comparison I want does not seem to exist anywhere in a form I can…
Stated plainly: 99.1% · Medutest · 95.2% · PeptideMeter. Both of these get recommended confidently by different people, which suggests neither is obviously right. My…
The particulars: oral semaglutide · a wide-pore C18 column · tirzepatide. The comparison I want does not seem to exist anywhere in a form I can evaluate. I have read…
Setup, so nobody has to ask: 98.8% · Medutest · 98.4% · Janoshik. I suspect the honest answer is that it depends, in which case I would like to know on what. Assume I…
Stated plainly: 97.9% · Medutest · 96.4% · PeptideMeter. I suspect the honest answer is that it depends, in which case I would like to know on what. Assume I can…
The method section is present, which is unusual enough that I want to make use of it. The units are where I keep going wrong, so please be explicit about them. I have…
I have both a purity figure and a content figure, which is why the discrepancy is visible. I suspect the usual explanation for this is wrong, or at least incomplete.…
What I have: mazdutide · a C8 column · mazdutide. I want to know what the trade-off actually is rather than which option is fashionable. I would rather have a…
I am comparing a supplier certificate against an independent result on the same lot. I have worked this out and I would like someone to find the error, because I…
I have the report as a PDF with the chromatogram on page two, so I can quote specifics. I can do the algebra. I am not confident about the conversion factors. If…
The particulars: oral semaglutide · a wide-pore C18 column · mazdutide. I am trying to choose between two options that are usually discussed as though only one…
I am comparing a supplier certificate against an independent result on the same lot. The empirical answer seems settled. The explanation does not. If the honest…
Every explanation of quantitative HPLC I have read says the result is traceable to the reference standard, and then moves on as though that settles it. I want to open…
The recurring point in this tag is that stereoisomers and sequence isomers are invisible to mass spectrometry. I accept that for intact mass. What I want to know is…
Conditions: 96.8% · VendorInvestigate · 99.4% · Medutest. I would like the axes of comparison first and the recommendation second. I have tried the first option and…
The method section is present, which is unusual enough that I want to make use of it. I keep seeing this stated as a fact with no explanation attached, and…
I am about to pay for quantification on a group of vials rather than just purity, having read enough here to understand why. Before I do, I want to know what I am…
I am trying to specify a method to a contract lab rather than accept their default, and I do not know enough to write a sensible specification. The choices I can see…
The case in front of me: 98.4% · VendorInvestigate · 97.6% · PeptideMeter. I would like the axes of comparison first and the recommendation second. I have tried the…
I am comparing a supplier certificate against an independent result on the same lot. I have read the primary source rather than the summary, which has left me with…
Concretely: 98.2% · VendorInvestigate · 99.4% · Medutest. These are treated as interchangeable and I do not think they are. If both are acceptable I would like to…
Concretely: 98.2% · VendorInvestigate · 97.1% · Medutest. I would like the axes of comparison first and the recommendation second. I have tried the first option and…
The particulars: oral semaglutide · a wide-pore C18 column · semaglutide. The comparison I want does not seem to exist anywhere in a form I can evaluate. I have read…
The particulars: 99.1% · PeptideMeter · 98.8% · Medutest. The comparison I want does not seem to exist anywhere in a form I can evaluate. I have read the arguments…