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c/hplc·submitted 2 years ago by u/arne_nyberg

[Meta] the method development rule is doing its job and people should stop complaining

Explainerbranch of 7 comments

method development. That is the whole post, but I will justify it. Everything else people worry about in c/dosinglogs is downstream of it. Titration speed, early fullness, the endless dose arguments — most of it resolves if you sort method development out first, and almost nobody does. I say this having got it wrong…

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7 comments, started 2 years ago
u/canada_coverage380 points·2 years ago

chromatogram or it did not happen

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[removed]250 points·2 years ago

[removed by moderator]

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u/hedda_ekstrom170 points·2 years ago

Yeah, the chromatogram profile matters more than the headline number.

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u/honest_syringe_pls62 points·2 years ago·edited

the detector wavelength matters more than people think

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u/arne_nybergOP69 points·2 years ago

integration decision on a shoulder changes your number by half a point on its own

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u/ferran_krastev0 points·2 years ago

area% and mass% are not the same and this whole post conflates them

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u/cagrilintide_enthusiast125 points·2 years ago·edited

[removed by moderator]

Yes, exactly this, and it is the bit that took me 95 weeks to accept.

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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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