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c/hplc·posted 4 months ago by u/nnt_nate

8 months in and HPLC is still the thing I get wrong

Method Receipts ×6 Well Actually ×1 Cold Box ×2

Long-ish post, sorry. tl;dr at the bottom.

I have been tracking method development against triglycerides for 25 weeks because I could not find anyone who had. The correlation is weaker than I expected, which is itself mildly interesting given how confidently people link the two in here.

Caveats up front: one person, one lab, one assay, no control, and I changed my training in the middle of it, which was stupid.

tl;dr: probably real, definitely smaller than the threads imply, and not worth reorganising your week around.

3,995 up / 202 down95% upvoted46 commentsid 1uvnip25 Mar 2026

46 comments

7 in this archive, depth 3

best — the order this archive was captured in

u/hamza_weiss866 points·4 months ago

the gradient is doing the separation work, not the column alone

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u/bilal_adebayo-22 points·4 months ago

the gradient is doing the separation work, not the column alone

Yes, exactly this, and it is the bit that took me 82 weeks to accept.

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u/micro_bump_mick1 point·4 months ago

Strongly agree. Largest single impurity tells a different story than total purity.

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[removed]609 points·4 months ago

[removed by moderator]

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u/peak_area_peteMOD545 points·4 months ago

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

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u/step_count_stan282 points·4 months ago

Retitled to remove editorialising.

Adding to this: gradient is doing more work than the comment implies.

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u/saskia_bakker226 points·4 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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