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c/coa·submitted 1 year ago by u/ignacio_silva

anyone else notice area percent kicking in around week 25

Questionbranch of 7 comments

Trying to settle this properly because the thread from last year went in circles. The claim: COA matters. The counter-claim: it is measurement error. Both sides have been asserting it confidently for about 18 months without either producing anything. What would actually settle it is 19 people measuring the same thing…

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7 comments, started 1 year ago
u/freya_baptista118 points·1 year ago
that is the funniest sentence i have read on this site
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u/sofia_danquah80 points·1 year ago

Cosigning. The batch number is load-bearing information.

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u/ignacio_silva21 points·1 year ago

That is net peptide content, not purity. Different number, different meaning.

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u/ignacio_silvaOP30 points·1 year ago

PDF metadata is checkable in fifteen seconds

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u/joaquin_ivaturi23 points·1 year ago

Cosigning. The batch number is load-bearing information.

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u/laila_yilmaz0 points·1 year ago

the related substances line is where the story is

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u/aleksi_eriksen0 points·1 year ago

the method line is doing real work, not just window dressing

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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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