Solvents left behind by synthesis and purification - acetonitrile, TFA, DMF, DCM - their ICH limits, how they are measured by headspace GC, and why they are usually absent from a research-grade certificate.
Numbers first: SWB · WuXi TIDES. I have used one of these for a while and I am considering switching, which requires a reason. What I care about is reproducibility,…
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…
The case in front of me: 40 mg · oral semaglutide. I want the working, not the result — I need to be able to redo it with different numbers. I care about the…
I have the report as a PDF with the chromatogram on page two, so I can quote specifics. I would like the mechanism, because I want to be able to reason about the…
The lot number on the vial matches the certificate, which at least rules out the easy problem. I have done this once and I suspect I got away with it rather than got…
Numbers first: cagrilintide · six weeks · 4 °C. This is a planning question. I know what my options are; I do not know how to weigh them. What I want is the minimum…
The case in front of me: HJ · oral semaglutide. The figures are clear enough; the question is what they mean and what they do not. I can supply the numbers if the…
What I am working with: dulaglutide · a C18 column · survodutide. Both of these get recommended confidently by different people, which suggests neither is obviously…
Conditions: semaglutide · 2 mg/mL. 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…
The pharmacy is accredited and I have verified that on the accreditor register. I have read the primary source rather than the summary, which has left me with more…
Conditions: list of related substances · GGPeps. I want to decide this in advance so that I am not deciding it under pressure later. Assume I will follow the plan I…
The particulars: PeptideMeter · Hunan Aslsen Technology. I have the document in front of me and I can read the numbers. What I cannot do is interpret them. I am…
What I have: cagrilintide · six weeks · 2–8 °C. This is a planning question. I know what my options are; I do not know how to weigh them. What I want is the minimum…
Concretely: 95.2% · VendorInvestigate · 97.9% · Medutest. I would like the axes of comparison first and the recommendation second. I have tried the first option and…
Aggregated, published test results and vendor ratings built from submitted batches. Methodology stated, dataset browsable, no listing fees.
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