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Single comment threadYou are looking at one branch of genuine question about area percent that I am slightly embarrassed to ask — 44 comments in the full submission. View in context.
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c/coa·submitted 2 months ago by u/ismael_eriksen

genuine question about area percent that I am slightly embarrassed to ask

Explainerbranch of 6 comments

genuine question about area percent that I am slightly embarrassed to ask. I am not trying to be the "source?" guy. I would just like a source. The four things a certificate must carry, and what each one is for. Batch identifier ties the document to your vial; without it the document is about somebody else’s…

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6 comments, started 2 months ago
u/halima_boateng36 points·2 months ago

net peptide content and purity are two different numbers on the same vial

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u/milos_trevino23 points·2 months ago·edited

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

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u/emeka_chowdhury25 points·2 months ago

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

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u/yara_antonsen12 points·2 months ago·edited

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

This is the sentence to take away. The rest of the thread is footnotes to it.

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u/wrong_network_w4 points·2 months ago

the related substances line is where the story is

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u/sofia_danquah8 points·2 months ago

That is the catalogue certificate rather than the batch-specific one. Same layout, completely different status.

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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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