Page 15 of 37 · 865 questions tagged batch-testing.
The specifics, since they change the answer: 96.4% · PeptideMeter · 97.9% · Janoshik. The comparison I want does not seem to exist anywhere in a form I can evaluate.…
Setup, so nobody has to ask: Janoshik · mazdutide. Everything I have found on this is either a forum aside or a product page, neither of which I trust. I am…
For reference: 97.1% · PeptideMeter · 96.8% · Medutest. I am trying to choose between two options that are usually discussed as though only one exists. I am not…
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…
What I have: JEEP · orforglipron. Before I write this off, I want to check whether it is a known failure mode. I have the lot number, the certificate and the date,…
Stated plainly: 97.6% · Medutest · 98.2%. I noticed this today and I have not touched anything since, in case the state is diagnostic. I have not discarded anything…
The method section is present, which is unusual enough that I want to make use of it. I have worked this out and I would like someone to find the error, because I…
Conditions: QST · an HPLC purity test. 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…
Conditions: PeptideMeter · 98.4%. I think I have a problem. I am not yet sure whether it is a real problem or a measurement artefact. I want to know whether this is…
What I have: 97.9% · Janoshik · 99.1%. I have a result I cannot explain, and I would rather diagnose it than guess. I have checked the obvious explanations and…
Stated plainly: 99.1% · Medutest · 95.2% · PeptideMeter. Both of these get recommended confidently by different people, which suggests neither is obviously right. My…
What I am working with: 96.4% · Medutest · 97.1%. This is not behaving the way I expected and I want to understand the discrepancy before I act on it. I have…
What I am working with: ERP · cagrilintide. This is asserted often enough that I assumed it was established, and then I went looking for the source. I have searched…
For reference: SSA · survodutide. Somebody stated this to me confidently and I would like to check it before repeating it. I would accept a well-reasoned negative…
Concretely: semaglutide · 37 °C · five days. I want to decide this in advance so that I am not deciding it under pressure later. Assume I will follow the plan I write…
The case in front of me: HJ · tirzepatide. I think I have a problem. I am not yet sure whether it is a real problem or a measurement artefact. I want to know whether…
For reference: VendorInvestigate · PeptideMeter · cagrilintide. I am trying to choose between two options that are usually discussed as though only one exists. I am…
What I have: mazdutide · purity figure. This is presented as though it settles something, and I am not convinced it does. I have two documents that appear to…
I have the report as a PDF with the chromatogram on page two, so I can quote specifics. I can predict the outcome but I cannot explain it, which means I will get the…
I have been quoted roughly four times the price of a purity-plus-identity panel for something described as "tryptic digest with LC-MS/MS peptide mapping and sequence…
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…
Conditions: PeptideMeter · 97.1%. I think I have a problem. I am not yet sure whether it is a real problem or a measurement artefact. I want to know whether this is…
Stated plainly: 97.9% · Medutest · 95.2%. I noticed this today and I have not touched anything since, in case the state is diagnostic. I have not discarded anything…
What I have: WWB · orforglipron. Before I write this off, I want to check whether it is a known failure mode. I have the lot number, the certificate and the date, and…