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

[Lab] split one vial across VendorInvestigate and PeptideMeter — 98.0% and 97.9%

Labbranch of 5 comments

Confession thread, sort of. I went from 0.25mg to 10mg much faster than I should have because the scale had stalled and I got impatient. The stall broke about 24 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 early…

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5 comments, started 2 years ago
u/dead_space_doug76 points·2 years ago

Four months on the site and I was confusing area% and mass% in every post I made. One explainer thread and it clicked.

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u/step_therapy_s38 points·2 years ago

area% is not mass%, and here is exactly why it matters

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u/ismael_eriksen55 points·2 years ago

That is net peptide content, not purity. Different number, different meaning.

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u/sig_figs_sammod · analytical15 points·2 years ago

the related substances line is where the story is

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u/teodor_jansen41 points·2 years ago

Four months on the site and I was confusing area% and mass% in every post I made.

Counter-anecdote: opposite result, same dose. Which mostly tells us the variance is huge.

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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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