🍪 The GLP Lounge uses cookies to improve your experience, analyze traffic, and personalize content. By continuing to use this site, you agree to our Cookie Policy.
Evidence-based GLP-1 & peptide discussion since 2023
ForumsCOA & Analytical TestingMass spectrometry for peptide identity verification — March 2026 Page 5

Mass spectrometry for peptide identity verification — March 2026

JakeBK_lifts Thu, Oct 31, 2024 at 6:08 AM 37 replies 2,134 viewsPage 5 of 8
MaxMetOK
Member
312
1,123
Dec 2024
Oklahoma
Nov 11, 2024 at 7:21 PM#21
AussieAnna said:
Whether it is right for the case being asked about depends on a detail that has not been given.

Can confirm. Same sequence, different timescale. Posting only so the count is not one.

8 6PharmHunterJen, TomTeleRx, DoseLogDan and 5 others
Reply Quote Save Share Report
oliver_london
Member
312
1,345
Aug 2024
London, UK
Nov 13, 2024 at 2:35 PM#22
AussieAnna said:
Whether it is right for the case being asked about depends on a detail that has not been given.

Adding the part of the answer the thread has not reached. The honest answer is that the effect is real, the magnitude is contested, and the individual variation is larger than either. Those three things can all be true at once, and most arguments here are two people holding different parts of that.

Happy to go further on any of that.

9 7MikeNYC_runner and 6 others
Reply Quote Save Share Report
BiostatsBrad
Member
456
2,345
Jul 2024
Durham, NC
Nov 15, 2024 at 9:48 AM#23

One concrete data point for the thread. For anyone reading later: the numbers in this thread are worth checking against a primary source before you act on them, including mine. Half the figures circulating in this community trace back to a secondary summary that dropped a qualifier.

10 8FranDenver, Dr.BariatricHTX, LindaRN_retired and 7 others
Reply Quote Save Share Report

Sigma-Aldrich — Research-Grade Standards

Certified reference materials, analytical reagents, and research-grade standards for peptide verification. Trusted by laboratories worldwide.

Shop Reference Standards
HPLC_Greg
Senior Member
1,890
8,901
Feb 2024
Research Triangle, NC
Nov 17, 2024 at 5:00 AM#24

A narrower follow-up, since the general answer is now clear:

What would you measure differently if you were starting again?

Last edited: Nov 17, 2024 at 11:00 AM
11 9Dr.MetabolicMD, RetaRick_CA, JenPlateau and 8 others
Reply Quote Save Share Report
DanielChem_CHI
Senior Member
1,234
5,678
Mar 2024
Chicago, IL
Nov 19, 2024 at 12:11 AM#25
BiostatsBrad said:
For anyone reading later: the numbers in this thread are worth checking against a primary source before you act on them, including mine.

Pushing back on BiostatsBrad here. The counter-case has not been addressed. Somebody upthread described the situation that does not fit, and the thread moved on rather than engaging with it, which is the failure mode this board is supposed to avoid.

12 10nick_SD_fit, ben_calgary, patPC_UT and 9 others
Reply Quote Save Share Report

Similar Threads

HPLC vs UPLC for peptide purity — method comparison study18 replies
Mass spectrometry for peptide identity verification — ESI-MS guide7 replies
Endotoxin testing methods — LAL vs recombinant Factor C17 replies
Red flags on COAs — how to spot a fake certificate5 replies
USP reference standards for peptide verification — sourcing guide3 replies
ForumsNewTrendingMembersAccount

Log In

Forgot password?
No account? Register