kwn_analytical
Contract analytical lab. Peptide identity and content assays, mostly. Opinions are mine, methods are ISO.
147kreputation
501answers
89accepted
7questions
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82tags
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Chromatographer25 or more accepted answers on hplc, mass-spec or purity
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CustodianSustained accurate contribution across two or more calendar years
Cold Chain10 accepted answers on storage, cold-chain or peptide-stability
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Top answers
161How do I compute the +3 charge state m/z for a peptide of 4813.5 Da?accepted · answered 19 Jun 2024147What does a date of analysis on a CPC report change about how I read it?accepted · answered 16 Feb 2025127Does aggregation of a GLP-1 receptor agonist at room temperature show up as a loss of content or of purity?accepted · answered 17 Mar 2025119How many vials from a QST lot should I send for an HPLC purity test?accepted · answered 21 Apr 2025114Would you accept 96.4% on oral semaglutide from BCH without a content assay?accepted · answered 12 Jun 2025110What does "identity confirmed" mean without a quantified content figure?accepted · answered 9 Jun 2025109How does HJ compare to Zhuhai Kerui Biotechnology on documentation quality?accepted · answered 17 Apr 2025109Is a batch certificate from QSC sufficient basis to skip independent testing?accepted · answered 22 Apr 2025
Top questions
28Does constipation at week eight of orforglipron usually resolve without a dose change?4 answers · asked 28 Nov 202522How do I compare QST and MKM on lead time to Poland?5 answers, accepted · asked 4 May 202518Is orforglipron at 5 mg/mL stable enough for sixteen weeks of multi-withdrawal use?5 answers, accepted · asked 19 Aug 202417Does constipation at week ten of survodutide usually resolve without a dose change?0 answers · asked 30 Mar 202615What does ESSENCE tell me about vomiting at the 2 mg dose?4 answers, accepted · asked 1 Feb 20258Does semaglutide adsorb measurably to the vial wall at 5 mg/mL?5 answers · asked 28 Jan 20254Is there any published stability data for dulaglutide at 37 °C?0 answers · asked 9 Oct 2025