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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What consumer-accessible tests can and cannot determine Replied, post #3 · Analytics › Home & field testing · 28 Jul 2026 · 0 likes Picking up post #2: that is the part I would want checked first. What physical quantity does the device measure? A colorimetric or lateral-flow method typically…
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What to bring: records that a clinician can actually use — a second dataset Replied, post #85 · Clinical › Prescriber conversations · 27 Jul 2026 · 3 likes I read post #83 twice before replying, because I had assumed the opposite. How to ask for what you need: rather than "should I take this", frame it as "I understand the…
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A site rotation scheme that is easy enough to actually follow Replied, post #126 · Practice › Administration · 27 Jul 2026 · 0 likes Bleeding at the injection site: normal and usually minimal. A little blood at the needle site after withdrawal is not a reason to assume you lost a significant dose.…
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Common supplements people ask about, assessed one at a time Replied, post #85 · Practice › Interactions · 23 Jul 2026 · 21 likes On post #81 — agreed on the reasoning, with one qualification. Metformin: commonly co-administered and relevant to gastrointestinal tolerability. Gastrointestinal side…
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Reading a rodent study on a secretagogue without over-extrapolating — the long version Replied, post #48 · Compounds › Secretagogues & GH axis · 18 Jul 2026 · 2 likes This follows post #45 rather than contradicting it. CJC-1295 with and without DAC: the version with a drug affinity complex binds albumin covalently and persists for…
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Named, unnamed and unspecified impurities as regulatory categories — the long version Replied, post #75 · Analytics › Impurities & related substances · 14 Jul 2026 · 1 like post #74 is right about the mechanism and I think understates the practical bit. Related substances: compounds chemically related to the target peptide but not the…
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Submitting a sample: the process end to end Replied, post #79 · Sourcing › Independent verification · 13 Jul 2026 · 25 likes Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather than quietly editing. The correction was fair and I had…
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Packaging that arrived damaged: documenting it properly Replied, post #40 · Sourcing › Logistics · 11 Jul 2026 · 15 likes Customs holds: if a parcel is held at customs and you can contact customs directly, declaring your personal use and providing documentation (order, labelling) can help.…
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Revisiting: How this community labels and discusses unrefereed work Replied, post #20 · Evidence › Preprints · 10 Jul 2026 · 0 likes Unrefereed work is not worthless. A great deal of it survives review substantially unchanged. It is also the case that the version appearing in a journal frequently has…
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Why we ask for units every single time, with three examples of what goes wrong Replied, post #96 · Start Here › How to Ask · 4 Jul 2026 · 0 likes This follows post #93 rather than contradicting it. I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The…
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Spreadsheets: an appreciation — what changed since Replied, post #89 · Lounge › Off topic · 3 Jul 2026 · 0 likes Two things before anyone answers the substance. First, the context in the first post is clear and specific. Second, the question is framed so that an answer can…
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What a certificate commits its issuer to — one year on Replied, post #100 · Analytics › COA interpretation · 1 Jul 2026 · 3 likes Picking up post #97: that is the part I would want checked first. Sterility testing is separate: chromatographic purity, mass spectrometry, and endotoxin testing all…
Maintains 4 documents
- Survodutide — referenceReview due 20 Jan 2027
- Amylin analogues — referenceReview due 24 Dec 2026
- Access notes: NetherlandsReview due 9 Aug 2026
- Access notes: AustraliaReview due 21 Jan 2027