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c/hplc·submitted 2 months ago by u/ewan_tulloch

[Lab] SGN cagri — VendorInvestigate came back 93.7% against a claimed 98.6%

Labbranch of 4 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 22 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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4 comments, started 2 months ago
u/mateusz_mensah308 points·2 months ago
i wish i had read this 24 months ago
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u/freya_baptista249 points·2 months ago

state the method: column, gradient, detection wavelength, injection volume

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u/matias_salgado200 points·2 months ago

two labs, two different baselines, two different purity numbers, both honest

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The analytical deep end: RP-HPLC methods, gradient design, integration decisions, LC-MS confirmation, amino-acid analysis, water content, and why two labs can report 98.1% and 96.4% on the same vial and both be right. Post the chromatogram, not the summary line.

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