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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 6 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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6 comments, started 2 years ago
u/aurel_boateng433 points·2 years ago

Inter-lab variance on this kind of assay is routinely 1–2 points. Different column, different gradient, different integration.

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u/low_appetite_lisa-19 points·2 years ago

post the whole document, not the headline number

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u/soren_zamora1 point·2 years ago·edited

Strongly agree. Mass% and area% are answering different questions on the same document.

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u/zaid_balogun325 points·2 years ago

Metadata check caught a COA that was created in a browser four months after the analysis date. Not evidence of fraud, but worth flagging to KP.

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u/kavya_verhoeven174 points·2 years ago

The confident tone is doing a lot of work that the evidence is not.

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u/amylin_amyOPamylin100 points·2 years ago

Tested the GLB raw material and a reseller vial side-by-side. Same purity claim, different impurity profiles. Handling matters.

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