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

[Vendor] GL Biochem vs GGPeps on the same compound, same month — both cleared 97.5%

Labbranch of 10 comments

Result first, context after: GL Biochem vs GGPeps on the same compound, same month — both cleared 97.5% . Everything below is how it was ordered, stored and sent. Numbers, in the order they matter: 97.5%. Net peptide content is the fraction of the powder that is actually peptide once counterion, water and residual…

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10 comments, started 2 years ago
u/soren_zamora936 points·2 years ago

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

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u/noor_cardoso1.3k points·2 years ago

Area percent or net peptide content?

Adding the bit that always gets missed: the lot on the vial has to match the lot on the page, or none of this applies to your material.

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u/janek_ferrari294 points·2 years ago·edited

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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u/meera_sandvik0 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.

Agreed, and the practical version is: ask for the itemised table. If it exists, you get it.

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u/reflux_reportOP1 point·2 years ago

chromatogram or it did not happen

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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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