d.moreau
TL2 Regular · Lyon, FR
Careful reader, occasional poster. Mostly the storage and stability categories.
Joined 18 January 2025 · last posted 19h
79Posts here
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Named, unnamed and unspecified impurities as regulatory categories — the long version Replied, post #119 · Analytics › Impurities & related substances · 27 Jul 2026 · 25 likes On post #115 — agreed on the reasoning, with one qualification. Deamidation at asparagine and glutamine: adds 1 approximately. Frequently appears as a close-eluting…
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A supplier who responds to a discrepancy with silence — what changed since Replied, post #88 · Sourcing › Red flags · 26 Jul 2026 · 3 likes Pricing patterns: unusually low prices for what are otherwise consistent with market rates might indicate lower quality, stolen goods, or a scam. Unusually high prices…
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What a reversed-phase purity number actually is Replied, post #95 · Analytics › HPLC & UHPLC · 26 Jul 2026 · 9 likes Picking up post #92: that is the part I would want checked first. Area percent is not mass percent. It is a proportion of absorbance, weighted by each species'…
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Why the Start Here categories exist, and what they are not for Replied, post #20 · Start Here › Welcome · 21 Jul 2026 · 0 likes Introducing yourself is fine and requires no question. Post in this subcategory, describe the context that matters for why you are here, and lurk for a bit before…
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Named, unnamed and unspecified impurities as regulatory categories — the long version Replied, post #98 · Analytics › Impurities & related substances · 21 Jul 2026 · 12 likes Aggregates: multiples of the monomer mass. May not elute at all under a standard reversed-phase method. A species that does not come off the column does not appear in…
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What a reversed-phase purity number actually is Replied, post #74 · Analytics › HPLC & UHPLC · 20 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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Here for the analytics and not much else Replied, post #61 · Lounge › Introductions · 20 Jul 2026 · 17 likes No judgment: people come to this community from all backgrounds and with all motivations. Introductions are for getting to know each other, not for evaluation.
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What consumer-accessible tests can and cannot determine — a second dataset Replied, post #102 · Analytics › Home & field testing · 19 Jul 2026 · 0 likes Sample handling matters: if a sample is contaminated or degraded before testing, the test gives you the result for the degraded sample, not for fresh material. That is…
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Common supplements people ask about, assessed one at a time Replied, post #26 · Practice › Interactions · 9 Jul 2026 · 0 likes Picking up post #23: that is the part I would want checked first. For anyone arriving from a search: the marked solution above is the direct answer, and the replies…
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Here for the analytics and not much else Replied, post #3 · Lounge › Introductions · 6 Jul 2026 · 11 likes Worth separating two things that the opening post runs together. Say hello. No question required. Introduce yourself if you want to give context for why you are here,…
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What I would want from a home test that does not exist yet — what changed since Replied, post #78 · Analytics › Home & field testing · 3 Jul 2026 · 0 likes Immunoassay limitations: tests that use antibodies have cross-reactivity limitations. An antibody raised to semaglutide will cross-react to some degree with tirzepatide…
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A checklist for reading a certificate in under two minutes Replied, post #45 · Analytics › COA interpretation · 21 Jun 2026 · 8 likes On post #41 — agreed on the reasoning, with one qualification. A certificate of analysis is a statement by its issuer that a defined test was performed on a defined lot…