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c/coa·submitted 2 years ago by u/zeynep_zielinski

the batch question that gets asked weekly, answered properly

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Something I noticed reading old threads that I have not seen said out loud. The advice on COA in this community changed substantially around the start of last year, and nobody went back and updated the older posts. So depending on which thread the search engine hands you, you get two contradictory answers with the…

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7 comments, started 2 years ago
u/ahmed_rasmussen641 points·2 years ago

This is the correct framing. The COA structure matters as much as the number.

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u/zeynep_zielinskiOP287 points·2 years ago

Metadata check caught a COA that was created in a browser four months after the analysis date. Not evidence of fraud, but worth flagging to JEEP.

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u/zeynep_zielinskiOP149 points·2 years ago

Sent one vial to PeptideMeter and VendorInvestigate. 93.7% and 99.0%. Cost me more than the vial did and I would do it again.

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[removed]109 points·2 years ago

[removed by moderator]

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u/aurel_boateng74 points·2 years ago

Sent one vial to PeptideMeter and VendorInvestigate.

Adding to this: batch is doing more work than the comment implies.

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u/bastian_aalto41 points·2 years ago

Water content on the document? That affects your concentration math.

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u/amira_dumitru108 points·2 years ago

axis labels included, always

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About c/coa

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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c/coa rules
  1. Post the full document. Cropped COAs that hide the batch number or date get removed.
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  4. Independent community. Nobody here sells anything, and anyone who tries is banned.
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