MJayawardena
TL3 Regular · Kuopio, FI
Long-standing member. Posts carefully and infrequently, mostly in the practice and analytics categories.
Joined 11 August 2024 · last posted 18h
144Posts here
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What a reversed-phase purity number actually is — the long version Started this topic · Analytics › HPLC & UHPLC · 26 Jul 2025 · 49 likes What a reversed-phase purity number actually is — the long version I have a specific reason for asking rather than idle curiosity, and the context is below. I would…
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Domestic fridge temperature mapping: a cheap experiment — what changed since Replied, post #129 · Devices › Cold chain · 24 Jun 2025 · 33 likes Temperature excursions: brief excursions above 8 °C are tolerable for most compounds. Hours to a day at room temperature is usually acceptable. Days to weeks at room…
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Follow-up: Tirzepatide and nausea: is the profile genuinely different or just… Replied, post #84 · Compounds › Tirzepatide · 24 May 2026 · 32 likes post #83 answers the question as asked. The question underneath it is different. Half-life difference: tirzepatide is about 5 days versus semaglutide's week-long.…
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Interim analyses and stopping rules — does this still hold? Replied, post #28 · Evidence › Trials · 3 Jul 2025 · 31 likes On post #24 — agreed on the reasoning, with one qualification. Practical note that does not fit anywhere else. Whatever you conclude from this topic, write down what…
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A 10 mg vial reconstituted three different ways, compared — the long version Replied, post #114 · Practice › Reconstitution · 28 Aug 2025 · 30 likes Why "add 2 mL" is not an instruction: the powder in the vial takes up space. "Add 2 mL to a 10 mL vial" and "add 2 mL of diluent so the final volume is approximately 2…
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Coming back to: What published stability data actually covers, and what it does not Replied, post #42 · Practice › Storage & stability · 16 May 2025 · 30 likes Protecting from light: amber vials or opaque containers reduce light exposure. If you are storing for long periods and light matters, this is worth doing. For…
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Badges earned, in order
| Badge | Tier | Granted |
|---|---|---|
| Basic User | bronze | 13 Aug 2024 |
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| Nice Topic | bronze | 30 Dec 2024 |
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| Batch Logger | silver | 5 Jan 2025 |
| Relentlessly Generous | gold | 15 Jan 2025 |
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| Regular | silver | 7 Apr 2025 |
| Good Topic | silver | 13 Apr 2025 |
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| Anniversary | silver | 11 Aug 2025 |
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