z.cardoso
TL2 · Dhaka
Contributes reviews on supplier material. Based in Dhaka.
Joined 28 April 2025 · last posted 2d
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What a reversed-phase purity number actually is Replied, post #96 · Analytics › HPLC & UHPLC · 26 Jul 2026 · 20 likes One caution on reversed-phase purity number: everything above assumes the underlying documentation is what it claims to be. That assumption is doing real work and is…
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What to bring: records that a clinician can actually use — a second dataset Replied, post #73 · Clinical › Prescriber conversations · 24 Jul 2026 · 16 likes This follows post #72 rather than contradicting it. A question phrased as "what would you want to see before considering X" is answerable and is not a request for X.
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Restarting after a long gap: what the labelling implies Replied, post #38 · Practice › Dosing & titration · 22 Jul 2026 · 0 likes Post #35 is right about the mechanism and I think understates the practical bit. Micro-titration: the concept of increments smaller than the labelled steps. It has no…
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Why we ask for units every single time, with three examples of what goes wrong Replied, post #117 · Start Here › How to Ask · 11 Jul 2026 · 24 likes A photograph of a vial is rarely useful and a photograph of a document usually is. Redact the identifiers before you post either.
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Coming back to: Lateral-flow and colorimetric approaches: the specificity problem Replied, post #69 · Analytics › Home & field testing · 7 Jul 2026 · 6 likes Taking post #68 at face value and following it one step further. Colorimetric and lateral-flow methods generally respond to a class of chemistry rather than to a…
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Here for the analytics and not much else Replied, post #2 · Lounge › Introductions · 6 Jul 2026 · 23 likes If you are arriving from somewhere louder, the pace here will feel slow. A topic can sit for two days and then get a reply that is worth the wait. That is the design…
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Named, unnamed and unspecified impurities as regulatory categories — the long version Replied, post #51 · Analytics › Impurities & related substances · 6 Jul 2026 · 4 likes Deletion sequences arise from incomplete coupling and are lower by one residue mass. Where they elute depends on the hydrophobicity of the residue that is missing, so…
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Fixed versus detachable needles: the trade-offs — does this still hold? Replied, post #8 · marked as the solution · Devices › Syringes & needles · 20 Jun 2026 · 7 likes Sharps disposal: needles and syringes should be disposed in a sharps container (a rigid, puncture-resistant container). Do not put them in regular trash. Many…
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Racemisation and why it is invisible to a mass measurement Replied, post #124 · Analytics › Impurities & related substances · 15 Jun 2026 · 20 likes The arithmetic on racemisation is the easy part and it is where the errors are, which is an uncomfortable combination. Show your working and someone will catch it.
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Transporting a vial for a weekend away — a second dataset Replied, post #78 · Practice › Storage & stability · 10 Jun 2026 · 0 likes Since Transporting a vial keeps coming up, it should probably be a maintained page rather than a recurring thread. I am happy to draft it if someone with more direct…
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Research-use-only status: what it means legally and practically Replied, post #54 · Compounds › Other compounds · 7 Jun 2026 · 0 likes Adding a null result on research-use-only status. I looked, carefully, and found nothing, and null results deserve posting precisely because they never are.
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What changed in 2026, by region — does this still hold? Replied, post #10 · Access › International · 22 May 2026 · 26 likes Picking up post #9: that is the part I would want checked first. Where a jurisdiction has published guidance for clinicians, that document usually answers the practical…