GLPHubglpresearchhub.com
Read-only archive. GLP Research Hub is a static community record — nothing here is for sale, no account is needed, and no vote you cast is counted. Why?
289
c/hplc·posted 2 months ago by u/isabela_nilsen

[Lab] SSA cagri — Medutest came back 97.4% against a claimed 96.2%

Lab Receipts ×5

Trying to settle this properly because the thread from last year went in circles.

The claim: integration matters. The counter-claim: it is measurement error. Both sides have been asserting it confidently for about 2 months without either producing anything.

What would actually settle it is 33 people measuring the same thing the same way. I have started; my numbers are below. They lean one way but not strongly enough for me to declare victory.

If you have data, post the data. If you have an opinion, flair it as an opinion.

299 up / 10 down97% upvoted12 commentsid x0h33c30 May 2026

12 comments

4 in this archive, depth 2

best — the order this archive was captured in

u/niels_lindqvist65 points·1 months ago

instrument quality is less important than analyst consistency

replysharereportpermalink
u/reverse_image_ron22 points·1 months ago

What was the column and what gradient?

replysharereportpermalink
u/step_count_stan50 points·1 months ago

Gradient goblin mode: changed the solvent composition 5 times, finally got good resolution on a chromatogram peak.

replysharereportpermalink
u/sofia_petrescu34 points·1 months ago

I am going to push back on this slightly.

replysharereportpermalink
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.

32kmembers
130submissions
Sep 2023created
submissions / month, last year
Sponsored

Sigma-Aldrich Standards

Certified reference materials for peptide identity and purity work.

sigmaaldrich.com
More in c/hplc
c/hplc rules
  1. Chromatogram or it did not happen. Axis labels included.
  2. State the method: column, gradient, detection wavelength, injection volume.
  3. Area% is not mass%. Posts that conflate them get a correction flair, not a removal.
  4. Independent community. Nobody here sells anything, and anyone who tries is banned.
  5. Not medical advice. Describe what you did; never prescribe to a stranger.
  6. Claims need evidence. Batch numbers, dated screenshots, independent test reports, or a citation.
  7. No referral links, discount codes or affiliate URLs. Permanent ban, no appeal.
  8. No contact handles, wallet addresses or tracking numbers — they identify people.
  9. Be recognisably decent. Disagree hard, insult nobody.
Full rules and how they are enforced →
Moderators
u/sig_figs_samu/hplc_hobbyistu/peak_area_peteu/mass_spec_maggie
Volunteers. Unpaid, unaffiliated, and reachable through modmail only.
Before you read on

Several compounds discussed on GLP Research Hub are sold for research use only and are not approved for human use anywhere. Nothing here is medical advice and none of it is written by your clinician. If a post reads like an instruction, treat it as a description of what one stranger did.

Full disclaimer →