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Single comment threadYou are looking at one branch of [COA] full document, nothing cropped, tell me what i am missing — 27 comments in the full submission. View in context.
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c/coa·submitted 1 months ago by u/janek_ferrari

[COA] full document, nothing cropped, tell me what i am missing

COAbranch of 9 comments

Posting this because I searched for it and got nothing useful. Setup: 10mg, week 38, sulphur burps present but not ruining anything. I changed exactly one variable — batch — and tracked it for 21 weeks. Result: a difference, but a small one, and well inside what I would call noise if someone else posted it. So I am…

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This branch

9 comments, started 1 months ago
u/dario_boateng43 points·1 months ago

the related substances line is where the story is

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[deleted]32 points·1 months ago

[deleted]

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u/janek_ferrariOP-33 points·1 months ago

The COA I was holding said 96.8% area and I thought it was trash. Turns out the method was solid and the impurity profile was clean.

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u/janek_ferrariOP1 point·1 months ago

The chromatogram trace is where the real information lives. The summary number is just a headline.

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u/nadia_fonseca1 point·1 months ago

Yeah, 96.8% area is not the problem, the missing impurity breakdown is the problem.

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u/coa_collectorarchivist1 point·1 months ago

area% is not mass%, and here is exactly why it matters

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u/aurel_boateng1 point·1 months ago

Yeah, 96.8% area is not the problem, the missing impurity breakdown is the problem.

Yes, exactly this, and it is the bit that took me 42 weeks to accept.

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u/janek_ferrariOP1 point·1 months ago

axis labels included, always

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u/milos_trevino28 points·1 months ago

purity and net content are two different numbers, same vial

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How to read a certificate of analysis and what it does and does not tell you. Area% versus mass%, identity versus quantity, water content, related substances, acetate counterions, and the difference between a vendor-supplied COA and an independent test on the vial you actually received.

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