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

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

Explainer Clean Column ×9 Cold Box ×2 Slow Clap ×2

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 for 21 months. My eGFR was the thing that eventually made me pay attention, which is a stupid way to learn a lesson that was in the sidebar the whole time.

12,341 up / 718 down95% upvoted17 commentsid uvp7d019 Apr 2024

17 comments

14 in this archive, depth 4

best — the order this archive was captured in

u/downvote_magnet524 points·2 years ago
okay but what dose
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u/coa_janitormod · c/coa127 points·2 years ago

axis labels included, always

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u/freya_baptista185 points·2 years ago

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

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u/enzo_petrescu145 points·2 years ago

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

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u/hplc_hobbyistMOD426 points·2 years ago

Retitled to remove editorialising. Put the evidence in the body.

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u/hamza_weiss347 points·2 years ago

related substances are where the story lives, not the main peak

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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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About c/hplc

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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