This is a continuation of a long topic, addressed by post number rather than by page. Start at post 1.
Picking up post #58: that is the part I would want checked first.
Amino acid analysis gives content: it hydrolyses the peptide and quantifies the residues. It measures the peptide content independent of chromatographic purity. Very few supplier certificates report it.
Marking my place. If it changes for me I will come back and say so.
The distinction between release testing and characterisation is one industrial documents make and retail ones usually do not. It is the difference between "we tested every lot for this" and "we established this once".
The honest answer is that it depends, and here is what it depends on.
An itemised related-substances table with retention times says considerably more about the synthesis than a single total. A total tells you how much is not the main peak and nothing about what it is.
That is the version I use. It may not be the version that is correct.
Reading old certificates: if a certificate is dated years ago, the lot it describes might be old. That is not automatically a problem but it is worth noting. Fresh testing on the current lot is stronger than old testing on an older lot.
I am not the right person to answer the follow-up to this.
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