p.frisk
TL2 · Kolkata
Contributes reviews on supplier material. Based in Kolkata.
Joined 31 January 2025 · last posted 1d
77Posts here
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What SELECT changed about how semaglutide is discussed, and what it did not Started this topic · Compounds › Semaglutide · 29 Jan 2025 · 37 likes Asking directly, because I could not find a straight answer: What SELECT changed about how semaglutide is discussed, and what it did not I was wrong about SELECT in a…
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[2026 update] A rising related-substance total over six months: degradation or method… Replied, post #58 · Analytics › Impurities & related substances · 18 Feb 2026 · 32 likes Something worth flagging about rising related-substance: the strongest-sounding claims in this thread are the ones with no source attached, which is the usual pattern…
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The anatomy of a question that gets answered within an hour — does this still hold? Replied, post #8 · Start Here › How to Ask · 9 Jul 2026 · 31 likes I read post #6 twice before replying, because I had assumed the opposite. A question about somebody else's post should be a reply to that post, not a new topic. A…
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Why mass spectrometry cannot tell you about an epimer Replied, post #65 · Analytics › Mass spectrometry · 21 Feb 2025 · 31 likes Common adducts: sodium adds ≈22, potassium adds ≈38 compared to hydrogen. A [M+Na]+ peak is common and its mass is predictable from the base mass. It is a small point…
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Distinguishing a deletion sequence by mass alone — the long version Replied, post #3 · Analytics › Mass spectrometry · 2 Feb 2025 · 31 likes Building on post #2 rather than restating it. Purity and identity are different questions: LC-MS establishes that the species at a retention time has the expected mass.…
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Follow-up: Why the titration planner refuses to produce a schedule below a floor Replied, post #90 · Data & Tools › Calculators · 21 Aug 2025 · 29 likes Acknowledging rather than arguing. The reasoning holds as far as I can follow it.
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