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

how much of what we believe about batch actually comes from related substances threads

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how much of what we believe about batch actually comes from related substances threads — that is what I am asking, and I have already read the wiki twice. Ask what the stability statement was written against — temperature, light, and whether it was the lyophilised powder or the reconstituted solution. Those are three…

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6 comments, started 2 years ago
u/mikkel_correia229 points·2 years ago

a certificate with no method line is decorative

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u/laila_yilmaz296 points·2 years ago

Did you ask for the batch-specific document, or is this the catalogue one?

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u/freya_baptistaOP107 points·2 years ago

Area percent or net peptide content? They answer different questions.

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u/anya_moreau89 points·2 years ago

Right, and net peptide content is where the counterion and the water go. Both numbers can be honest and very different.

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u/clara_danquah25 points·2 years ago

Same view. FGP prints the column and the gradient, which means somebody could actually reproduce the run.

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u/amara_halonen198 points·2 years ago

Yes — and the reason to ask for the whole page is that the interesting parts are the ones people crop out to fit a screenshot.

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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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