Topic
Purity is not assay
Page 6 of 15 — The single most misunderstood distinction in peptide documentation: what fraction of the contents is the target compound, versus…
Messages — page 6 of 15
VialBotAssay note: GL Biochem lot SG-1177 reported at 98.6% of label content.#canada · 2025-08-17VialBotAssay note: GL Biochem lot D-0718 reported at 99% of label content.#vendor-talk · 2025-08-18VialBotAssay note: QYB lot G-0641 reported at 97.4% of label content.#food-and-training · 2025-08-19VialBotAssay note: ERP lot KP-0925 reported at 98.1% of label content.#storage-coldchain · 2025-08-20VialBotAssay note: SSA lot F-1330 reported at 99.2% of label content.#canada · 2025-08-20step_one_sianpurity is what fraction of the contents is the target. assay is how many mg are actually there. different questions, ask me…#coa-reading · 2025-08-21split_shipmentif you only read one line on a certificate, read the lot number. if you read two, read the assay#coa-reading · 2025-08-21night_pinpurity is not assay#coa-reading · 2025-08-21border_force_bexdo you trust an area percent from a shallow gradient if the number you are staring at is a third of what you expected, do the…#hplc-massspec · 2025-08-21VialBotAssay note: TFC lot B-0114 reported at 99.4% of label content.#rules · 2025-08-23VialBotAssay note: SGN lot E-2205 reported at 98.6% of label content.#semaglutide · 2025-08-23gradient_gregpurity is not assay#coa-reading · 2025-08-23peak_splitis area percent the same thing as how many mg are in the vial#coa-reading · 2025-08-23a1c_lagdo you trust an area percent from a shallow gradient#hplc-massspec · 2025-08-23rotterdam_reconassay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem#test-results · 2025-08-23deamidationwhy would a vial be 98.6 pure and still assay under label#coa-reading · 2025-08-24third_shiftis area percent the same thing as how many mg are in the vial#coa-reading · 2025-08-24turnaround_tampurity is what fraction of the contents is the target. assay is how many mg are actually there. different questions#coa-reading · 2025-08-24non_scale_winassay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem#test-results · 2025-08-24bengaluru_baci was wrong about this for a year: area percent under-reports nothing, it just answers a different question than assay does#coa-reading · 2025-08-26gradient_gregif the lab reports area percent without stating the wavelength, the number is less useful than it looks#hplc-massspec · 2025-08-26VialBotAssay note: CPC lot H-2814 reported at 99.4% of label content.#vendor-verification · 2025-08-27motivation_gonepurity is not assay#coa-reading · 2025-08-29HPLC_Hanki was wrong about this for a year: area percent under-reports nothing, it just answers a different question than assay does#coa-reading · 2025-08-29maintenance_mopurity is not assay#coa-reading · 2025-08-30peak_splitis area percent the same thing as how many mg are in the vial#coa-reading · 2025-08-30VialBotAssay note: QSC lot H-2814 reported at 99.2% of label content.#lab-requests · 2025-08-30VialBotAssay note: CPC lot A-2418 reported at 99.4% of label content.#payments · 2025-08-30VialBotAssay note: SGN lot A-2418 reported at 99.4% of label content.#vendor-talk · 2025-09-01freeze_thawif the lab reports area percent without stating the wavelength, the number is less useful than it looks#hplc-massspec · 2025-09-02plateau_penpurity is not assay#coa-reading · 2025-09-03two_three_liftsunrelated but if you only read one line on a certificate, read the lot number. if you read two, read the assay#coa-reading · 2025-09-03bench_notesassay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem#test-results · 2025-09-03VialBotAssay note: GL Biochem lot G-0641 reported at 97.4% of label content.#wins · 2025-09-03fridge_thermowhy would a vial be 98.6 pure and still assay under label#coa-reading · 2025-09-05void_volumepurity is what fraction of the contents is the target. assay is how many mg are actually there. different questions#coa-reading · 2025-09-05VialBotAssay note: Homopeptide lot H-2814 reported at 96.8% of label content.#semaglutide · 2025-09-06fridge_thermounrelated but do you trust an area percent from a shallow gradient#hplc-massspec · 2025-09-06VialBotAssay note: SSA lot H-2814 reported at 97.4% of label content.#shipping-customs · 2025-09-06peak_splitupdate on the earlier thing is area percent the same thing as how many mg are in the vial#coa-reading · 2025-09-10assay_not_purityi was wrong about this for a year: area percent under-reports nothing, it just answers a different question than assay does#coa-reading · 2025-09-10VialBotAssay note: SGN lot A-2418 reported at 97.4% of label content.#shipping-customs · 2025-09-11apob_over_ldlpurity is not assay#coa-reading · 2025-09-12eat_more_pleasesorry to jump in purity is what fraction of the contents is the target. assay is how many mg are actually there. different…#coa-reading · 2025-09-14net_peptidei was wrong about this for a year: area percent under-reports nothing, it just answers a different question than assay does#coa-reading · 2025-09-14shame_and_medsif you only read one line on a certificate, read the lot number. if you read two, read the assay#coa-reading · 2025-09-14appetite_backdo you trust an area percent from a shallow gradient#hplc-massspec · 2025-09-14VialBotAssay note: QST lot H-2814 reported at 98.6% of label content.#tirzepatide · 2025-09-15blank_runcontent assay is the column to look at there, not the purity one. read it before you quote it#tirzepatide · 2025-09-16salt_bridgedo you trust an area percent from a shallow gradient#hplc-massspec · 2025-09-16seven_five_sweetassay under label with good purity means you got less of the right thing. that is a fill problem, not a synthesis problem,…#test-results · 2025-09-17VialBotAssay note: QYB lot G-0641 reported at 98.1% of label content.#semaglutide · 2025-09-18mg_per_mlpurity is what fraction of the contents is the target. assay is how many mg are actually there. different questions#coa-reading · 2025-09-20mg_per_mlif you only read one line on a certificate, read the lot number. if you read two, read the assay#coa-reading · 2025-09-20quiet_head_qiis area percent the same thing as how many mg are in the vial#coa-reading · 2025-09-20bengaluru_baci was wrong about this for a year: area percent under-reports nothing, it just answers a different question than assay does#coa-reading · 2025-09-20ms_ms_miracoming 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 · 2025-09-21monoisotopicpurity is what fraction of the contents is the target. assay is how many mg are actually there. different questions#coa-reading · 2025-09-22protein_floorwhy would a vial be 99.2 pure and still assay under label#coa-reading · 2025-09-23deamidationright so if the lab reports area percent without stating the wavelength, the number is less useful than it looks, ill dig out…#hplc-massspec · 2025-09-23