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

reading batch threads from 2024 and half of it aged badly

Labbranch of 5 comments

Confession thread, sort of. I went from 5mg to 1.7mg much faster than I should have because the scale had stalled and I got impatient. The stall broke about 20 weeks later, at which point I had no way of knowing whether the dose increase did anything or whether it would have broken anyway. So now I have…

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5 comments, started 1 year ago
u/aleksi_eriksen1.6k points·1 year ago·edited

Three years on this site and the questions have not changed at all. Which is depressing or reassuring depending on the day.

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u/yannick_haddad760 points·1 year ago

Yeah, 96.8% area is not the problem, the missing impurity breakdown is the problem.

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u/low_appetite_lisaOP-21 points·1 year ago

Asked BCH for the batch-specific COA and they sent it within six hours, full document, batch number, date, everything. That is the baseline.

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u/low_appetite_lisaOP1 point·1 year ago

The chromatogram trace is where the real information lives. The summary number is just a headline.

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u/janek_ferrari1 point·1 year ago

Asked BCH for the batch-specific COA and they sent it within six hours, full document, batch number, date, everything.

Yes, exactly this, and it is the bit that took me 72 weeks to accept.

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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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Independent HPLC and mass spec. The number you get is the number they found.

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