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

three years of COA threads, summarised so you do not have to read them

Questionbranch of 7 comments

three years of COA threads, summarised so you do not have to read them. It is the sort of thing everyone half-believes and nobody writes down. Asked GL Biochem for the batch-specific certificate and had the full document — batch, date, method line naming the column — inside six hours. That is now my baseline for…

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7 comments, started 1 year ago
u/katrin_girard32 points·1 year ago·edited

Related substances itemised individually is a much stronger document than a single total, because it tells you the shape of the impurity profile rather than its size.

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u/valeria_girardOP22 points·1 year ago

Asked for the storage condition behind the stability statement. Got it in a sentence. It is a two-line email and almost nobody sends it.

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[removed]9 points·1 year ago

[removed by moderator]

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u/receptor_bias_rick25 points·1 year ago

Batch number and date of analysis, are both on there?

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u/amira_dumitru7 points·1 year ago

That is not what the method line says. It names the technique; it does not certify the operator.

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u/coa_collectorarchivist18 points·1 year ago

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

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u/nikhil_lindqvist14 points·1 year ago

ask for the storage condition the stability statement was written against

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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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