Page 13 of 33 · 771 questions tagged coa.
Stated plainly: GL Biochem · Chinese Peptide Company. The comparison I want does not seem to exist anywhere in a form I can evaluate. I have read the arguments for…
The specifics, since they change the answer: JEEP · orforglipron. I would rather be corrected now than propagate something wrong. I am specifically not interested in…
Conditions: 96.4% · VendorInvestigate · 98.2%. I have two candidate explanations and no way to distinguish them. The same procedure has worked without incident…
Stated plainly: 95.2% · a C18 column · survodutide. I have read the primary source rather than the summary, which has left me with more questions. I understand the…
What I am working with: mazdutide · sixteen weeks · room temperature. I would rather over-plan the first cycle and simplify later. I am prepared to do the work if…
Two COAs for the same nominal product give me endotoxin specifications of "less than 10 EU/mg" and "less than 0.5 EU/mg" respectively. Both pass. The second vendor…
This is my second independent submission on material from the same supplier. I want a method I can write down and repeat, not a rule of thumb. I would rather…
What I have: dulaglutide · two weeks · room temperature. I am trying to build something sustainable rather than something thorough that I will abandon. I have already…
Costs, fees and monitoring all included, I am trying to compare like with like. I have the document in front of me and I can read the numbers. What I cannot do is…
This is a first order from this supplier, so I have no track record to reason from. I want to know whether this is a real physical effect or an artefact of how it is…
What I have: Janoshik · mazdutide. Everything I have found on this is either a forum aside or a product page, neither of which I trust. I am comfortable with the…
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 particulars: dulaglutide · Medutest. I have read the primary source rather than the summary, which has left me with more questions. I understand the headline. I…
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…
Setup, so nobody has to ask: 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…
Conditions: 98.2% · method section. The figures are clear enough; the question is what they mean and what they do not. I can supply the numbers if the specifics…
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…
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…
The specifics, since they change the answer: ERP · cagrilintide. This is asserted often enough that I assumed it was established, and then I went looking for the…
Setup, so nobody has to ask: SSA · survodutide. Somebody stated this to me confidently and I would like to check it before repeating it. I would accept a…
Conditions: HJ · Zhuhai Kerui Biotechnology. These are treated as interchangeable and I do not think they are. If both are acceptable I would like to know that, so I…
The particulars: mazdutide · Janoshik. This is presented as though it settles something, and I am not convinced it does. I have two documents that appear to disagree,…
Conditions: 97.1% · method section. The figures are clear enough; the question is what they mean and what they do not. I can supply the numbers if the specifics…
A report I have includes traces at two wavelengths from the same injection, using a diode-array detector. The 214 nm trace integrates to 98.6% and the 280 nm trace to…