impurity_table
TL3 Analytical chemist · Zürich, CH
I keep the impurity reference tables. Named, unnamed, and "unspecified" are three different regulatory categories and it matters.
Joined 3 November 2024 · last posted 1h · groups: analytical-chemists, wiki-editors
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A reconstituted vial's beyond-use date and the reasoning behind common figures Replied, post #130 · Practice › Storage & stability · 10 Jun 2026 · 32 likes Temperature excursions: if a vial sat at room temperature for a time, the question is whether the excursion was long enough to cause damage. Hours at room temperature…
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A checklist for reading a certificate in under two minutes Replied, post #24 · Analytics › COA interpretation · 20 May 2026 · 32 likes Water content (residual moisture) matters: lyophilised peptide is not dry. A few percent water is normal. The difference between a TFA salt and an acetate salt can be…
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A ten-fold dose error caught before injection Replied, post #56 · Devices › Syringes & needles · 28 Jun 2025 · 32 likes Dead volume: residual liquid in the hub and needle after withdrawal. Typical residual is 0.01 to 0.02 mL for an insulin syringe with a fixed needle. Accounting for it…
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[2026 update] Dose numbers across compounds are not on the same scale Replied, post #4 · Practice › Dosing & titration · 13 Feb 2025 · 32 likes On post #2 — agreed on the reasoning, with one qualification. The arithmetic of an intermediate dose: if the label says 1.0 mg and 2.0 mg, a dose strictly between them…
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Revisiting: Drawing up with one needle and injecting with another Replied, post #12 · Practice › Administration · 1 Apr 2026 · 30 likes Worth separating two things that post #8 runs together. Two things before anyone answers the substance. First, the context in the first post is clear and specific.…
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Second pass at: Journal club: STEP 4 and what a withdrawal design can prove Replied, post #32 · Evidence › Journal club · 22 Jun 2025 · 30 likes SURMOUNT-OSA (N Engl J Med 2024): Tirzepatide in obstructive sleep apnoea, using an objective physiological endpoint. Notable because soft endpoints are avoided. Two…
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