🍪 CompoundTalk 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 TestingAmino acid analysis for peptide identity — beyond mass spec Page 5

Amino acid analysis for peptide identity — beyond mass spec

PeptideSynthNJ Wed, May 27, 2026 at 3:38 AM 21 replies 716 viewsPage 5 of 5
kate.chem
VIP Member
3,890
17,654
Dec 2023
California
May 31, 2026 at 2:34 PM#21
Dr.PathRoch said:
One practical note: write down what you did and when, before you need it.

Right, and the exception is worth naming rather than left implied, because the exception is where people get into trouble.

16 14steve_okc, dave_SLC, FDA_TrackerJim and 13 others
Reply Quote Save Share Report
Dr.BariatricHTX
Senior Member
1,456
7,234
Feb 2024
Houston, TX
Jun 2, 2026 at 10:47 AM#22
Dr.PathRoch said:
One practical note: write down what you did and when, before you need it.

Saving this. It is the first explanation that did not require me to already understand it. Taking it to my next appointment.

17 15pete_RVA, CarlaRPh_TPA, steph_laguna and 14 others
Reply Quote Save Share Report
DebRD_ATL
Senior Member
1,678
7,890
Feb 2024
Atlanta, GA
Jun 4, 2026 at 6:59 AM#23

Clinical perspective, offered as context rather than as advice. Worth answering the question that was asked rather than the one behind it. The narrow version usually has an answer; the broad version usually does not, and answering the broad one is how a thread stops being useful.

Last edited: Jun 4, 2026 at 10:59 AM
18 16SleepDoc_PDX, RegAffairsDC, BiostatsBrad and 15 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
CryptoCarl
Member
789
3,456
May 2024
Arizona
Jun 6, 2026 at 3:10 AM#24
DebRD_ATL said:
Worth answering the question that was asked rather than the one behind it.

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

Last edited: Jun 6, 2026 at 7:10 AM
19 17BethLabQueen, ChrisMacros, KetoKyle and 16 others
Reply Quote Save Share Report
alex_tucson
Member
567
2,345
May 2024
Tucson, AZ
Jun 7, 2026 at 11:20 PM#25
DebRD_ATL said:
Worth answering the question that was asked rather than the one behind it.

There is a second half to this that has not been said yet. Take it one variable at a time. Almost every unanswerable question in these threads is unanswerable because three things changed in the same fortnight, and no amount of subsequent argument can untangle them after the fact.

20 18FDA_TrackerJim, ricardo_MIA, BrianDallas92 and 17 others
Reply Quote Save Share Report
1345

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