Lab Testing

Lab testing — HPLC chromatograms, COA reading, Janoshik testing, peptide purity analysis, and sterility testing.

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Pinned Lab-talk ground rules — data first, feelings second
pepsreview_mod
2
2545
victor705 Aug 29
I paid out of pocket to double-check a lab sheet
Victor_C
0
384
Victor_C Today at 8:10 AM
HPLC says 98.7% but independent lab shows 1.4% shoulder
trial_tracker
18
873
lab32 Saturday at 2:33 PM
Same vial, two HPLC labs, 5.5% purity gap?
protein_patricia
9
1572
casey64 Sep 29
Same sample, two labs, 1.8% purity gap — normal?
carlos81
16
2218
amber_83 Sep 28
Same batch, two COAs: 4.2% purity gap — method or sample?
old_school_pep
15
1293
grant_reviewer Sep 27
Independent HPLC 91.2% vs COA 98.7% - same vial?
stocked_steve
14
2148
data_miner_dan Sep 27
Independent HPLC 93.2% vs COA 97.8% — method artifact?
sourcing_sue
15
3254
fiona_14 Sep 3
HPLC 98.7% but LC-MS TIC shows extra peaks?
nauseous_nina
14
1767
stable_stella Aug 22