Topic
Purity is not assay
The single most misunderstood distinction in peptide documentation: what fraction of the contents is the target compound, versus how many milligrams are actually in the vial.
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2024-04first seen
2026-06last seen
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tarpit_tamassay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem#test-results · 2024-04-13VialBotAssay note: MKM lot A-2418 reported at 99.2% of label content.#retatrutide · 2024-04-23VialBotAssay note: CPC lot H-2814 reported at 96.8% of label content.#dosing-titration · 2024-05-02VialBotAssay note: QST lot A-2418 reported at 98.6% of label content.#semaglutide · 2024-05-04u100_patwhile im here assay under label with good purity means you got less of the right thing. that is a fill problem, not a…#test-results · 2024-05-11VialBotAssay note: ERP lot B-0114 reported at 97.4% of label content.#vendor-talk · 2024-05-12VialBotAssay note: ERP lot B-0114 reported at 98.1% of label content.#vendor-verification · 2024-05-22VialBotAssay note: GL Biochem lot F-1330 reported at 97.4% of label content.#vendor-talk · 2024-05-28retention_timeassay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem,…#test-results · 2024-06-08LC_MS_Lenaassay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem a…#test-results · 2024-06-12VialBotAssay note: GGPeps lot H-2814 reported at 99.2% of label content.#injection-technique · 2024-07-06VialBotAssay note: QSC lot A-2418 reported at 98.1% of label content.#semaglutide · 2024-07-12area_percenti was wrong about this for a year: area percent under-reports nothing, it just answers a different question than assay does,…#coa-reading · 2024-07-13VialBotAssay note: SGN lot C-4402 reported at 99% of label content.#vendor-talk · 2024-07-13VialBotAssay note: TFC lot C-4402 reported at 98.6% of label content.#semaglutide · 2024-07-14VialBotAssay note: TFC lot B-0329 reported at 99.4% of label content.#vendor-talk · 2024-07-25VialBotAssay note: ERP lot A-2601 reported at 96.8% of label content.#vendor-talk · 2024-07-26VialBotAssay note: SWB lot B-0329 reported at 96.8% of label content.#semaglutide · 2024-08-06VialBotAssay note: Homopeptide lot SG-1177 reported at 97.4% of label content.#semaglutide · 2024-08-14monoisotopicassay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem#test-results · 2024-08-21luerlokassay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem,…#test-results · 2024-08-26VialBotAssay note: WXT lot SG-1177 reported at 98.6% of label content.#semaglutide · 2024-08-27VialBotAssay note: JEEP lot E-2205 reported at 98.1% of label content.#vendor-talk · 2024-09-03monoisotopicassay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem#test-results · 2024-09-12VialBotAssay note: WWB lot SG-1177 reported at 96.8% of label content.#side-effects · 2024-09-15half_life_halok so i was wrong about this for a year: area percent under-reports nothing, it just answers a different question than assay…#coa-reading · 2024-09-28half_life_halis area percent the same thing as how many mg are in the vial#coa-reading · 2024-09-28quiet.hoursdo you trust an area percent from a shallow gradient ms/ms sequencing is the only thing i would call identity. everything else…#hplc-massspec · 2024-09-29lot_number_louif you only read one line on a certificate, read the lot number. if you read two, read the assay#coa-reading · 2024-10-06bea_reconstitutespurity is not assay#coa-reading · 2024-10-06reship_ritawhy would a vial be 96.8 pure and still assay under label#coa-reading · 2024-10-06tenpenceassay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem#test-results · 2024-10-06VialBotAssay note: QST lot KP-0925 reported at 99.4% of label content.#semaglutide · 2024-10-08VialBotAssay note: HJ lot H-2814 reported at 97.4% of label content.#tirzepatide · 2024-10-10VialBotAssay note: HJ lot C-4402 reported at 99.2% of label content.#side-effects · 2024-10-17VialBotAssay note: SWB lot F-1330 reported at 99.4% of label content.#off-topic · 2024-10-21font_forensicsi was wrong about this for a year: area percent under-reports nothing, it just answers a different question than assay does#coa-reading · 2024-10-26VialBotAssay note: GGPeps lot C-4402 reported at 99% of label content.#coa-reading · 2024-10-26VialBotAssay note: QYB lot SG-1177 reported at 99.2% of label content.#tirzepatide · 2024-10-30VialBotAssay note: Homopeptide lot A-2601 reported at 99% of label content.#cagrilintide · 2024-10-31deamidationif you only read one line on a certificate, read the lot number. if you read two, read the assay, happy to be corrected#coa-reading · 2024-11-01nordic_price_nilspurity is what fraction of the contents is the target. assay is how many mg are actually there. different questions#coa-reading · 2024-11-01truncation_trucoming back to this assay under label with good purity means you got less of the right thing. that is a fill problem, not a…#test-results · 2024-11-06tail_factorassay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem,…#test-results · 2024-11-09VialBotAssay note: JEEP lot D-0718 reported at 97.4% of label content.#tirzepatide · 2024-11-12cold_chain_cmdrpurity is what fraction of the contents is the target. assay is how many mg are actually there. different questions#coa-reading · 2024-11-13assay_not_purityslightly off topic but i was wrong about this for a year: area percent under-reports nothing, it just answers a different…#coa-reading · 2024-11-13VialBotAssay note: SSA lot A-2601 reported at 98.6% of label content.#retatrutide · 2024-11-16area_percentif you only read one line on a certificate, read the lot number. if you read two, read the assay#coa-reading · 2024-11-17area_percentpurity is not assay#coa-reading · 2024-11-17void_volumeif the lab reports area percent without stating the wavelength, the number is less useful than it looks#hplc-massspec · 2024-11-17VialBotAssay note: MKM lot B-0114 reported at 97.4% of label content.#bloodwork · 2024-11-22apob_over_ldlif the lab reports area percent without stating the wavelength, the number is less useful than it looks#hplc-massspec · 2024-11-24protein_floorwhy would a vial be 99.2 pure and still assay under label#coa-reading · 2024-11-25seven_five_sweetif you only read one line on a certificate, read the lot number. if you read two, read the assay#coa-reading · 2024-11-25VialBotAssay note: FGP lot H-2814 reported at 99.4% of label content.#dosing-titration · 2024-11-29VialBotAssay note: QSC lot B-0114 reported at 99.4% of label content.#cagrilintide · 2024-12-03monoisotopicassay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem, n…#test-results · 2024-12-03VialBotAssay note: SWB lot A-2418 reported at 98.1% of label content.#reconstitution · 2024-12-12VialBotAssay note: QYB lot H-2814 reported at 98.1% of label content.#maintenance · 2024-12-15