Topic
Reading a certificate of analysis
Page 4 of 6 — What a COA certifies, what it omits, and how to read the related-substances table rather than just the headline number.
Messages — page 4 of 6
quiet.hoursthe related substances table is the interesting part. a row of "not detected" means they did not look hard#coa-reading · 2026-02-08area_percentwhats the related substances table actually telling me#coa-reading · 2026-02-08rotterdam_reconshallow gradients hide related substances behind the main peak. a steeper one separates and looks worse, honestly#hplc-massspec · 2026-02-08karl_fischerthe related substances table is the interesting part. a row of "not detected" means they did not look hard#coa-reading · 2026-02-09first_and_last_fourshallow gradients hide related substances behind the main peak. a steeper one separates and looks worse, honestly#hplc-massspec · 2026-02-09lot_number_loushallow gradients hide related substances behind the main peak. a steeper one separates and looks worse, honestly#hplc-massspec · 2026-02-10area_percentshallow gradients hide related substances behind the main peak. a steeper one separates and looks worse, honestly#hplc-massspec · 2026-02-12vienna_vialwhats the related substances table actually telling me#coa-reading · 2026-02-14truncation_truthe related substances table is the interesting part. a row of "not detected" means they did not look hard, i could be wrong#coa-reading · 2026-02-16mhra_unlicensedthe related substances table is the interesting part. a row of "not detected" means they did not look hard#coa-reading · 2026-02-18retention_timeshallow gradients hide related substances behind the main peak. a steeper one separates and looks worse, honestly, from memory#hplc-massspec · 2026-02-19void_volumeupdate on the earlier thing the related substances table is the interesting part. a row of "not detected" means they did not…#coa-reading · 2026-02-20retention_timethe related substances table is the interesting part. a row of "not detected" means they did not look hard#coa-reading · 2026-02-23peak_splitwhats the related substances table actually telling me#coa-reading · 2026-02-25gip_glp_gilslightly off topic but shallow gradients hide related substances behind the main peak. a steeper one separates and looks…#hplc-massspec · 2026-02-25travel_coolerthe related substances table is the interesting part. a row of "not detected" means they did not look hard#coa-reading · 2026-02-26per_mg_petewhats the related substances table actually telling me#coa-reading · 2026-02-28per_mg_petethe related substances table is the interesting part. a row of "not detected" means they did not look hard#coa-reading · 2026-02-28apob_over_ldlshallow gradients hide related substances behind the main peak. a steeper one separates and looks worse, honestly#hplc-massspec · 2026-03-01deamidationwhats the related substances table actually telling me#coa-reading · 2026-03-02gradient_gregshallow gradients hide related substances behind the main peak. a steeper one separates and looks worse, honestly#hplc-massspec · 2026-03-02void_volumewhats the related substances table actually telling me the certificate from QSC is the one i use to teach this because it…#coa-reading · 2026-03-06salt_bridgeshallow gradients hide related substances behind the main peak. a steeper one separates and looks worse, honestly#hplc-massspec · 2026-03-06HPLC_Hankwhats the related substances table actually telling me#coa-reading · 2026-03-07month_six_meslightly off topic but the related substances table is the interesting part. a row of "not detected" means they did not look…#coa-reading · 2026-03-08area_percentshallow gradients hide related substances behind the main peak. a steeper one separates and looks worse, honestly#hplc-massspec · 2026-03-11electrolyte_elishallow gradients hide related substances behind the main peak. a steeper one separates and looks worse, honestly, for what…#hplc-massspec · 2026-03-12yyz_vialright so the related substances table is the interesting part. a row of "not detected" means they did not look hard the…#coa-reading · 2026-03-13karl_fischerwhats the related substances table actually telling me#coa-reading · 2026-03-13gradient_gregsorry to jump in shallow gradients hide related substances behind the main peak. a steeper one separates and looks worse,…#hplc-massspec · 2026-03-13two_four_ceilingthe related substances table is the interesting part. a row of "not detected" means they did not look hard#coa-reading · 2026-03-14related_substhe related substances table is the interesting part. a row of "not detected" means they did not look hard mixed fonts and…#coa-reading · 2026-03-15stack_scepticthe related substances table is the interesting part. a row of "not detected" means they did not look hard#coa-reading · 2026-03-16a1c_lagfollow up whats the related substances table actually telling me#coa-reading · 2026-03-21no_appetite_niathe related substances table is the interesting part. a row of "not detected" means they did not look hard#coa-reading · 2026-03-21ghent_gradientshallow gradients hide related substances behind the main peak. a steeper one separates and looks worse, honestly, n of 1…#hplc-massspec · 2026-03-24underfill_umaok so whats the related substances table actually telling me#coa-reading · 2026-03-26lipase_lorewhats the related substances table actually telling me#coa-reading · 2026-03-28lisbon_lotsorry to jump in the related substances table is the interesting part. a row of "not detected" means they did not look hard…#coa-reading · 2026-03-28truncation_trushallow gradients hide related substances behind the main peak. a steeper one separates and looks worse, honestly#hplc-massspec · 2026-03-28bram_beginsthere is a second table on my COA under the purity line and i have no idea what any of it means#coa-reading · 2026-03-29assay_not_purityok that is a related substances table. it is the vendor telling you what the missing 1.1% is made of#coa-reading · 2026-03-29bram_beginsso a COA with a big unnamed impurity is worse than one with lots of small named ones#coa-reading · 2026-03-29assay_not_puritythis, roughly#coa-reading · 2026-03-29lot_number_loushallow gradients hide related substances behind the main peak. a steeper one separates and looks worse, honestly#hplc-massspec · 2026-03-29cold_pack_carlathe related substances table is the interesting part. a row of "not detected" means they did not look hard#coa-reading · 2026-03-30marrow.modshallow gradients hide related substances behind the main peak. a steeper one separates and looks worse, honestly#hplc-massspec · 2026-03-30HPLC_Hankshallow gradients hide related substances behind the main peak. a steeper one separates and looks worse, honestly#hplc-massspec · 2026-03-31split_dose_samthe related substances table is the interesting part. a row of "not detected" means they did not look hard#coa-reading · 2026-04-07seven_five_sweetthe related substances table is the interesting part. a row of "not detected" means they did not look hard#coa-reading · 2026-04-08seven_five_sweetwhats the related substances table actually telling me#coa-reading · 2026-04-08hydrate_hanashallow gradients hide related substances behind the main peak. a steeper one separates and looks worse, honestly#hplc-massspec · 2026-04-09juniper_joinsshallow gradients hide related substances behind the main peak. a steeper one separates and looks worse, honestly#hplc-massspec · 2026-04-11karl_fischerquick one whats the related substances table actually telling me#coa-reading · 2026-04-12ivy_injectsprobably me being dense but the lot on my COA is not the lot on the vial#vendor-verification · 2026-04-12ivy_injectscode block#vendor-verification · 2026-04-12peak_splitcode block#vendor-verification · 2026-04-12VialBotpaperwork note logged: flourishglobalbio · lot FG-25-0619 · COA transposition, corrected within 4h, raw trace supplied · no…#vendor-verification · 2026-04-12pbs_pipright so whats the related substances table actually telling me#coa-reading · 2026-04-13triple_ag_tomshallow gradients hide related substances behind the main peak. a steeper one separates and looks worse, honestly#hplc-massspec · 2026-04-13