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COA & Analytical Testing

145 threads · 1.9K posts
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Study Amino acid analysis for peptide identity — beyond mass spec
PeptideSynthNJ · May 27, 2026
21Replies
716Views
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PeptideSynthNJ
May 27, 2026
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Guide How to commission independent testing — labs that accept consumer samples
PurityPaulOR · May 25, 2026
9Replies
430Views
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PurityPaulOR
May 25, 2026
CT
Study Particulate matter testing — USP <788> for injectable peptides
CarlaRPh_TPA · May 24, 2026
20Replies
606Views
CT
CarlaRPh_TPA
May 24, 2026
HG
Study Inter-lab variability in peptide testing — why results differ between labs
HPLC_Greg · May 21, 2026
15Replies
493Views
HG
HPLC_Greg
May 21, 2026
CK
Warning COA red flag compilation — real examples of suspicious certificates
COA_Karl · May 19, 2026
8Replies
388Views
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COA_Karl
May 19, 2026
NN
New What even IS a COA and why should I care
nick_newbie · May 17, 2026
5Replies
356Views
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nick_newbie
May 17, 2026
JS
New My vendor COA looks sketchy - can someone take a look
jason_sac26 · May 15, 2026
7Replies
508Views
JS
jason_sac26
May 15, 2026
HM
New Are all COAs created equal? Mine looks different from others I see
hannah_MT · May 12, 2026
4Replies
438Views
HM
hannah_MT
May 12, 2026

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Hot Paid for independent testing and results did not match vendor COA
PurityPaulOR · May 9, 2026
36Replies
1.1KViews
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PurityPaulOR
May 9, 2026
MP
New Is 98% purity actually good or should I be worried
mona_PHX · May 6, 2026
11Replies
559Views
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mona_PHX
May 6, 2026
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New HPLC vs UPLC for peptide purity — 6 month update
PeptideChemSF · May 4, 2026
8Replies
504Views
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PeptideChemSF
May 4, 2026
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Hot Mass spectrometry for peptide identity verification — March 2026
Dr.ObesityMed · Apr 30, 2026
29Replies
706Views
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Dr.ObesityMed
Apr 30, 2026
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Study Endotoxin testing methods — what worked for you?
Dr.KarenChen · Apr 27, 2026
15Replies
838Views
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Dr.KarenChen
Apr 27, 2026
SN
Guide Red flags on COAs — my results so far
sarah_nash92 · Apr 24, 2026
8Replies
642Views
SN
sarah_nash92
Apr 24, 2026
PM
New USP reference standards for peptide verification — anyone have experience?
pete_manc_UK · Apr 21, 2026
5Replies
571Views
PM
pete_manc_UK
Apr 21, 2026
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