I read the earlier replies on field-by-field walk through a certificate twice before writing this, because I had assumed the opposite and wanted to be sure I was disagreeing with what was said rather than what I expected.
25 likes 3mo
Topic summary
Revisiting: A field-by-field walk through a certificate of analysis
This is a generated summary. It shows the 6 most-liked posts from a topic of 42, in their original order, with the accepted answer included where one exists. It is a reading aid and it will miss nuance — the full topic is the record.
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.
I looked this up rather than remembered it, which is the right order.
21 likes 3mo
Noted, and thank you for writing it out rather than summarising it.
29 likes 3mo
h.falk, post #1: Revisiting: A field-by-field walk through a certificate of analysis Writing it up because I had to work it out twice and would rather nobody else did. I would like to disagree carefully with the settled view on field-by-field walk through a certificate, and I would like to be argued out of it if the disagreement is bad. The disagreement… Go to post
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".
Offering a way to settle field-by-field walk through a certificate rather than another opinion about it. Two measurements, taken the same way, a fortnight apart. If the difference is within the noise, the question was not answerable at this precision.
25 likes 3mo
s.ivaturi, post #32: Reading this field-by-field walk through a certificate thread as someone who came in with a fixed view: the third and seventh replies moved me and the confident ones did not. Go to post
What fields matter on a certificate: lot number matching the vial, test date, the analytical method stated specifically, the measured result as a number, and the acceptance limit stated separately. A certificate missing any of these is weaker.
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This topic was referenced in
- Coming back to: "Greater than or equal to 99%" as a specification rather than a resultAnalytics › COA interpretation · 2 replies
- When a tidy document is a signal and when it is decoration — does this still hold?Analytics › COA interpretation · 7 replies
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