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c/hplc·posted 2 months ago by u/rina_bergstrom

what would you tell week-1 you about HPLC

Lab Slow Clap ×1 The Quiet One ×3 Clean Column ×2

Week 47 update. 43kg down from the start, reflux basically gone since about week 87.

Things that worked: consistency, protein at breakfast, walking more than I want to. Things that did not: everything I bought on the internet to help with reflux.

The part that surprised me is how much of this is admin. Ordering, storing, logging, remembering. Nobody mentions that the hard bit is not the drug, it is the routine.

Happy to answer anything. Please do not ask me what dose you should be on.

4,661 up / 1,211 down79% upvoted30 commentsid xagosb26 May 2026

30 comments

16 in this archive, depth 4

best — the order this archive was captured in

u/endotoxin_elliemicro761 points·2 months ago

The practical rule people converge on is 28 days at fridge temperature after first puncture, and that comes from the preservative, not the peptide.

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u/nnt_nate264 points·2 months ago

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

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[removed]199 points·2 months ago

[removed by moderator]

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u/rasmus_kimani344 points·2 months ago·edited

The evidence standard in c/vendorvetting gets called too strict about once a month, and every time, the thread ends with the complainant agreeing.

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u/ignacio_vanhecke169 points·2 months ago

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

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u/yara_boateng51 points·2 months ago

This is the correct method framing. Column and gradient are load-bearing fields.

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u/alcohol_aversion352 points·2 months ago

I love that this community will spend 40 comments on a detail. That pedantry is why the numbers here matter.

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u/endotoxin_elliemicro-18 points·2 months ago

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

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u/marisol_frisk159 points·2 months ago·edited

This is the correct method framing. Column and gradient are load-bearing fields.

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u/hamza_weiss49 points·2 months ago

Slight fix: the number was 98.7, not 98.6. Decimal point, but a fairly consequential one.

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u/careful_gradient102 points·2 months ago

Gradient goblin mode: changed the solvent composition 4 times, finally got good resolution on a LC-MS peak.

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u/vikram_asante36 points·2 months ago

No. This is the kind of confident post that gets copied into a screenshot and repeated for years. Where is the evidence.

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u/peak_area_peteanalytical11 points·2 months ago

axis labels included, always

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u/vikram_asante6 points·2 months ago

Injection volume and flow rate? Those affect resolution.

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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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