how much of what we believe about purity actually comes from related substances threads
Genuine question, and the title is the question: how much of what we believe about purity actually comes from related substances threads. Related substances itemised individually is a much stronger document than a single total, because it tells you the shape of the impurity profile rather than its size. Net peptide…
LC-MS gives you identity; UV purity gives you a relative quantity. A document with the first and not the second, or the reverse, is answering half the question.
Disagree that a lower number is automatically worse. A conservative claim that survives testing is worth more than an optimistic one that does not.
ask for the storage condition the stability statement was written against
Your name and address edited out of the screenshot above. The batch details are untouched and should stay.
Correction: that is net peptide content, not purity. Different number, different meaning, and the document says so if you read the row label.
Your name and address edited out of the screenshot above.
Disagree on this specific point. Two honest labs can resolve that impurity differently and report different numbers.