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c/coa·submitted 4 months ago by u/nadia_fonseca

small win: batch stopped being a problem at week 6

Labbranch of 8 comments

Been lurking in c/survodutide for about 10 months and finally have something worth posting. Short version: week 87, 1.0mg, and batch is the bit I still cannot get a straight answer on. I have read the wiki, I have read the last 7 threads, and the answers split roughly down the middle. What I actually want to know is…

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8 comments, started 4 months ago
u/rania_okonkwo46 points·4 months ago

Water content matters more than people think. If a vial is carrying residual moisture, your "10mg" is not 10mg of peptide.

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u/sofia_ferreira14 points·4 months ago·edited

Not to be pedantic but batch and certificate of analysis are being used interchangeably and they are not interchangeable in real life.

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u/yara_antonsen12 points·4 months ago

the counterion is part of the mass you paid for

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u/zeynep_zielinski22 points·4 months ago

no "is this good?" without saying what the compound and claimed purity are

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u/tomas_lehtinen6 points·4 months ago

axis labels included, always

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u/tidy_vialdrawer_pls2 points·4 months ago·edited

the method line is doing real work, not just window dressing

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u/nadia_fonseca1 point·4 months ago

Disagree but this is the good kind of wrong — it is specific enough to be checked.

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u/valeria_karlsen66 points·4 months ago

Cosigning. The batch number is load-bearing information.

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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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