Topic
Purity is not assay
Page 10 of 15 — The single most misunderstood distinction in peptide documentation: what fraction of the contents is the target compound, versus…
Messages — page 10 of 15
ten_of_tenpurity is what fraction of the contents is the target. assay is how many mg are actually there. different questions#coa-reading · 2026-01-23ten_of_tenif you only read one line on a certificate, read the lot number. if you read two, read the assay#coa-reading · 2026-01-23warsaw_vialdo you trust an area percent from a shallow gradient#hplc-massspec · 2026-01-23yyz_vialassay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem, we…#test-results · 2026-01-23acetate_ashif the lab reports area percent without stating the wavelength, the number is less useful than it looks#hplc-massspec · 2026-01-25fake_trackingdo you trust an area percent from a shallow gradient#hplc-massspec · 2026-01-25VialBotAssay note: TFC lot C-4402 reported at 99% of label content.#food-and-training · 2026-01-25VialBotAssay note: QSC lot D-0718 reported at 98.6% of label content.#asia · 2026-01-27egfr_edpurity is what fraction of the contents is the target. assay is how many mg are actually there. different questions#coa-reading · 2026-01-28VialBotAssay note: WWB lot A-2601 reported at 99.4% of label content.#bloodwork · 2026-01-29freeze_thawwhy would a vial be 98.6 pure and still assay under label#coa-reading · 2026-01-29taper_or_notpurity is not assay#coa-reading · 2026-01-29two_four_ceilingpurity is not assay#coa-reading · 2026-01-29monoisotopici was wrong about this for a year: area percent under-reports nothing, it just answers a different question than assay does#coa-reading · 2026-01-30group_buy_gwendo you trust an area percent from a shallow gradient tirzepatide is about 4813.5 Da, so 2+ is near 2407.8 and 3+ near 1605.5#hplc-massspec · 2026-01-30VialBotAssay note: QSC lot B-0329 reported at 99.4% of label content.#wins · 2026-01-30VialBotAssay note: FGP lot A-2418 reported at 99% of label content.#side-effects · 2026-01-31assay_not_puritydo you trust an area percent from a shallow gradient#hplc-massspec · 2026-01-31assay_not_purityif the lab reports area percent without stating the wavelength, the number is less useful than it looks#hplc-massspec · 2026-01-31group_buy_gwenpurity is what fraction of the contents is the target. assay is how many mg are actually there. different questions#coa-reading · 2026-02-01group_buy_gwenwhy would a vial be 98.6 pure and still assay under label#coa-reading · 2026-02-01VialBotAssay note: MKM lot D-0718 reported at 99% of label content.#oral-glp1 · 2026-02-02VialBotAssay note: JEEP lot H-2814 reported at 99.4% of label content.#other-peptides · 2026-02-02bac_water_billpurity is not assay#coa-reading · 2026-02-02ms_ms_mirawhy would a vial be 98.1 pure and still assay under label#coa-reading · 2026-02-02HPLC_Hankassay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem, ask…#test-results · 2026-02-02VialBotAssay note: BCH lot D-0718 reported at 98.6% of label content.#eu · 2026-02-03gall_bladder_gavassay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem#test-results · 2026-02-04salt_bridgeassay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem#test-results · 2026-02-05VialBotAssay note: SGN lot G-0641 reported at 96.8% of label content.#test-results · 2026-02-05salt_bridgeif you only read one line on a certificate, read the lot number. if you read two, read the assay#coa-reading · 2026-02-06tyne_trackswhy would a vial be 99.4 pure and still assay under label#coa-reading · 2026-02-06lean_mass_lexis area percent the same thing as how many mg are in the vial#coa-reading · 2026-02-06lean_mass_lexi was wrong about this for a year: area percent under-reports nothing, it just answers a different question than assay does#coa-reading · 2026-02-06mag_citratepurity is not assay#coa-reading · 2026-02-07void_volumeis area percent the same thing as how many mg are in the vial#coa-reading · 2026-02-07assay_not_puritywhy would a vial be 98.6 pure and still assay under label#coa-reading · 2026-02-07evidence_or_notif you only read one line on a certificate, read the lot number. if you read two, read the assay#coa-reading · 2026-02-07reship_ritais area percent the same thing as how many mg are in the vial#coa-reading · 2026-02-08HPLC_Hankunrelated but do you trust an area percent from a shallow gradient#hplc-massspec · 2026-02-08HPLC_Hankassay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem#test-results · 2026-02-08void_volumeis area percent the same thing as how many mg are in the vial#coa-reading · 2026-02-09two_three_liftspurity is not assay#coa-reading · 2026-02-09monoisotopicdo you trust an area percent from a shallow gradient#hplc-massspec · 2026-02-09VialBotAssay note: Homopeptide lot A-2601 reported at 98.1% of label content.#mental-health · 2026-02-09VialBotAssay note: BCH lot G-0641 reported at 98.6% of label content.#reconstitution · 2026-02-13VialBotAssay note: GGPeps lot KP-0925 reported at 98.6% of label content.#vendor-verification · 2026-02-14area_percentwhy would a vial be 99.4 pure and still assay under label#coa-reading · 2026-02-16VialBotAssay note: FGP lot C-4402 reported at 98.6% of label content.#side-effects · 2026-02-17dexa_or_biafollow up assay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis…#test-results · 2026-02-18VialBotAssay note: QST lot KP-0925 reported at 99.2% of label content.#semaglutide · 2026-02-19retention_timefor the archive if the lab reports area percent without stating the wavelength, the number is less useful than it looks#hplc-massspec · 2026-02-19void_volumewhy would a vial be 99.2 pure and still assay under label#coa-reading · 2026-02-20evidence_or_noti was wrong about this for a year: area percent under-reports nothing, it just answers a different question than assay does, i…#coa-reading · 2026-02-20salt_bridgeupdate on the earlier thing purity is what fraction of the contents is the target. assay is how many mg are actually there.…#coa-reading · 2026-02-20septum_salassay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem#test-results · 2026-02-21taper_tesspurity is what fraction of the contents is the target. assay is how many mg are actually there. different questions#coa-reading · 2026-02-22taper_tesswhy would a vial be 96.8 pure and still assay under label#coa-reading · 2026-02-22homa_ir_hugopurity is not assay#coa-reading · 2026-02-23retention_timewhy would a vial be 97.4 pure and still assay under label#coa-reading · 2026-02-23