d.moreau
TL2 Regular · Lyon, FR
Careful reader, occasional poster. Mostly the storage and stability categories.
Joined 18 January 2025 · last posted 19h
78Posts 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. Aggregates: multiples of the monomer mass. May not elute at all under a standard reversed-phase method.…
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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 Inconsistency across documents: a certificate stating one purity, a website claiming another, and a supplier's verbal representation claiming a third, all on the same…
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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. Injection volume matters because column overload distorts peak shape, and an overloaded main peak can…
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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 Summarising the Start thread so far, since it is long and the answer is buried: the first reply has the method, the fourth has the correction to it, and the rest is…
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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 Scavengers and cleavage-cocktail residues can persist and appear as small early-eluting peaks. They are process-related rather than sequence-related, which is a useful…
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What a reversed-phase purity number actually is Replied, post #74 · Analytics › HPLC & UHPLC · 20 Jul 2026 · 0 likes Same experience here, different supplier, so it is at least not unique to one of them.
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Here for the analytics and not much else Replied, post #61 · Lounge › Introductions · 20 Jul 2026 · 17 likes No spam: introductions are not a place to advertise commercial products or services. That is a rules violation. Correct me on the arithmetic if it is wrong; I would…
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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 The right question for any home test is: what physical quantity does it measure, and what would have to be true for that quantity to answer your question? Most…
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Common supplements people ask about, assessed one at a time Replied, post #26 · Practice › Interactions · 9 Jul 2026 · 0 likes Helpful, and easy to find again, which is half of what a good reply is.
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Here for the analytics and not much else Replied, post #3 · Lounge › Introductions · 6 Jul 2026 · 11 likes Welcome. Nobody will mind you asking something basic. The people most likely to answer are the ones who remember not knowing it.
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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 Precision of home tests: most consumer-accessible devices are not precise to the level people want ("is this 99% pure or 97% pure"). They give a yes/no or a rough…
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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. Peptide content and chromatographic purity are separate determinations and a certificate that reports…