Topic
Purity is not assay
Page 14 of 15 — The single most misunderstood distinction in peptide documentation: what fraction of the contents is the target compound, versus…
Messages — page 14 of 15
VialBotAssay note: SGN lot F-1330 reported at 98.1% of label content.#off-topic · 2026-05-14HPLC_Hankpurity is not assay#coa-reading · 2026-05-15verify_or_dontif the lab reports area percent without stating the wavelength, the number is less useful than it looks#hplc-massspec · 2026-05-16tess_tirzok so assay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem#test-results · 2026-05-16VialBotAssay note: FGP lot A-2418 reported at 99.2% of label content.#canada · 2026-05-16area_percentupdate on the earlier thing i was wrong about this for a year: area percent under-reports nothing, it just answers a different…#coa-reading · 2026-05-17two_ml_twoupdate on the earlier thing if you only read one line on a certificate, read the lot number. if you read two, read the assay a…#coa-reading · 2026-05-17myrrh_measureswhy would a vial be 98.6 pure and still assay under label#coa-reading · 2026-05-17provincial_patdo you trust an area percent from a shallow gradient#hplc-massspec · 2026-05-17tga_noticeassay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem,…#test-results · 2026-05-17a1c_lagis area percent the same thing as how many mg are in the vial#coa-reading · 2026-05-18a1c_lagi was wrong about this for a year: area percent under-reports nothing, it just answers a different question than assay does#coa-reading · 2026-05-18karl_fischersorry to jump in if the lab reports area percent without stating the wavelength, the number is less useful than it looks#hplc-massspec · 2026-05-18no_escrow_natei was wrong about this for a year: area percent under-reports nothing, it just answers a different question than assay does, n…#coa-reading · 2026-05-19bpc_scepticpurity is what fraction of the contents is the target. assay is how many mg are actually there. different questions#coa-reading · 2026-05-19birch_bloodsassay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem#test-results · 2026-05-19hydrate_hanafollow up purity is what fraction of the contents is the target. assay is how many mg are actually there. different questions#coa-reading · 2026-05-20pinch_not_stretchfollow up if you only read one line on a certificate, read the lot number. if you read two, read the assay#coa-reading · 2026-05-20power_through_nois area percent the same thing as how many mg are in the vial#coa-reading · 2026-05-20hydrate_hanapurity is not assay#coa-reading · 2026-05-20zoya_zerosdo you trust an area percent from a shallow gradient#hplc-massspec · 2026-05-20endotoxin_edif you only read one line on a certificate, read the lot number. if you read two, read the assay#coa-reading · 2026-05-21triple_ag_tomwhy would a vial be 98.6 pure and still assay under label#coa-reading · 2026-05-21VialBotAssay note: ERP lot D-0718 reported at 99.4% of label content.#test-results · 2026-05-21flint_fillsassay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem#test-results · 2026-05-22VialBotAssay note: QST lot B-0114 reported at 97.4% of label content.#mental-health · 2026-05-23VialBotAssay note: GL Biochem lot H-2814 reported at 98.6% of label content.#side-effects · 2026-05-24underfill_umapurity is not assay#coa-reading · 2026-05-24batch_banditi was wrong about this for a year: area percent under-reports nothing, it just answers a different question than assay does,…#coa-reading · 2026-05-24pharmac_penpurity is what fraction of the contents is the target. assay is how many mg are actually there. different questions i was…#coa-reading · 2026-05-24VialBotAssay note: MKM lot G-0641 reported at 99% of label content.#reconstitution · 2026-05-25salt_bridgei was wrong about this for a year: area percent under-reports nothing, it just answers a different question than assay does,…#coa-reading · 2026-05-25area_percentassay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem#test-results · 2026-05-25nordic_price_nilsif you only read one line on a certificate, read the lot number. if you read two, read the assay#coa-reading · 2026-05-26monoisotopicif you only read one line on a certificate, read the lot number. if you read two, read the assay#coa-reading · 2026-05-27monoisotopicsorry to jump in i was wrong about this for a year: area percent under-reports nothing, it just answers a different question…#coa-reading · 2026-05-27LC_MS_Lenais area percent the same thing as how many mg are in the vial#coa-reading · 2026-05-28LC_MS_Lenaok so purity is what fraction of the contents is the target. assay is how many mg are actually there. different questions#coa-reading · 2026-05-28blank_runi was wrong about this for a year: area percent under-reports nothing, it just answers a different question than assay does#coa-reading · 2026-05-29split_dose_samis area percent the same thing as how many mg are in the vial a vial can be 99.4% pure and hold 8.1mg of a 10mg label. both…#coa-reading · 2026-05-29sasha_stackspurity is not assay#coa-reading · 2026-05-29VialBotAssay note: Homopeptide lot D-0718 reported at 96.8% of label content.#payments · 2026-05-29blank_runi was wrong about this for a year: area percent under-reports nothing, it just answers a different question than assay does#coa-reading · 2026-05-30nordic_price_nilsdo you trust an area percent from a shallow gradient#hplc-massspec · 2026-05-30tesa_tessif the lab reports area percent without stating the wavelength, the number is less useful than it looks, your mileage will…#hplc-massspec · 2026-05-30VialBotAssay note: Homopeptide lot A-2601 reported at 96.8% of label content.#cagrilintide · 2026-05-31turnaround_tampurity is not assay#coa-reading · 2026-05-31salt_bridgewhy would a vial be 98.1 pure and still assay under label#coa-reading · 2026-05-31salt_bridgeif you only read one line on a certificate, read the lot number. if you read two, read the assay#coa-reading · 2026-05-31underfill_umaassay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem#test-results · 2026-05-31VialBotAssay note: FGP lot SG-1177 reported at 98.1% of label content.#maintenance · 2026-06-01VialBotAssay note: SWB lot H-2814 reported at 99.2% of label content.#cagrilintide · 2026-06-02truncation_truis area percent the same thing as how many mg are in the vial#coa-reading · 2026-06-02VialBotAssay note: SSA lot B-0329 reported at 99.2% of label content.#cagrilintide · 2026-06-03lisbon_lotif you only read one line on a certificate, read the lot number. if you read two, read the assay, take that with a pinch of salt#coa-reading · 2026-06-03acetate_ashif the lab reports area percent without stating the wavelength, the number is less useful than it looks#hplc-massspec · 2026-06-03VialBotAssay note: FGP lot C-4402 reported at 98.1% of label content.#off-topic · 2026-06-03sedge_sourcesif the lab reports area percent without stating the wavelength, the number is less useful than it looks#hplc-massspec · 2026-06-04VialBotAssay note: TFC lot D-0718 reported at 99.4% of label content.#shipping-customs · 2026-06-04void_volumei was wrong about this for a year: area percent under-reports nothing, it just answers a different question than assay does#coa-reading · 2026-06-05