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c/coa·submitted 11 months ago by u/purity_pedant

[Lab] 7th independent test on WXT — 99.2% on a claimed 98.5%, and the trend is the interesting part

Labbranch of 6 comments

7th independent test on WXT — 99.2% on a claimed 98.5%, and the trend is the interesting part. That is the headline. The document, the batch and the service are below so you can argue with the method rather than with me. Numbers, in the order they matter: 99.2% and 98.5%. Asked ERP for the batch-specific certificate…

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6 comments, started 11 months ago
u/chidi_demir341 points·11 months ago

I would not read a rounded figure as evasive. Plenty of documents round to one decimal as house style.

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[deleted]150 points·11 months ago

[deleted]

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u/tidy_vialdrawer_pls49 points·11 months 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/purity_pedantOPanalytical106 points·11 months ago

Are the related substances itemised or is it a single total?

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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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