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ForumsCOA & Analytical TestingHow to read a Certificate of Analysis — complete guide Page 14

How to read a Certificate of Analysis — complete guide

COA_Karl Mon, Feb 26, 2024 at 4:00 PM 245 replies 11,691 viewsPage 14 of 20
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Mar 24, 2024 at 4:25 AM#66

Moderator note: a post naming a supplier has been edited. Discuss suppliers in the review sections, not here. Thread quality here is what the rules are for. Keep it up.

45 18PedsEndoPhilly, SleepDoc_PDX, RegAffairsDC and 42 others
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PeptideChemSF
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Mar 24, 2024 at 3:49 PM#67

The figures, for anyone assembling their own picture. If you are going to change something, change one thing and give it long enough to express itself. Four weeks is the usual minimum for anything pharmacological on this board, and two weeks of data has told you almost nothing.

Last edited: Mar 24, 2024 at 7:49 PM
46 19dave_SLC, FDA_TrackerJim, ricardo_MIA and 43 others
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maria_elpaso
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Mar 25, 2024 at 3:13 AM#68

One thing that is still open after COA_Karl’s answer:

How would you tell the difference between that and the alternative explanation?

47 20TrialNerd_Beth, HPLC_Greg, LibrarianMeg and 44 others
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Sigma-Aldrich — Research-Grade Standards

Certified reference materials, analytical reagents, and research-grade standards for peptide verification. Trusted by laboratories worldwide.

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Dr.RheumBOS
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Mar 25, 2024 at 2:37 PM#69
PeptideChemSF said:
If you are going to change something, change one thing and give it long enough to express itself.

I am going to disagree with the direction of travel here. The thread has converged on the tidiest answer rather than the best-supported one, and those are not the same thing.

Last edited: Mar 25, 2024 at 8:37 PM
48 21lori_vegas, Dr.PulmRoch, maya_sedona and 45 others
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Dr.DermMIA
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Mar 26, 2024 at 2:00 AM#70
PeptideChemSF said:
If you are going to change something, change one thing and give it long enough to express itself.

Correct as far as it goes. The part it does not cover is what to do when the honest answer is "not enough data", which is more often than anyone likes.

That is the short version; the long version is somebody else's post.

20 18SurmountFan_IN, PeptideChemSF, A1cHero_PHX and 17 others
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