g.tanaka
TL3 Regular · Nagoya, JP
Materials scientist. Adsorption to surfaces, container closure, and why concentration matters for losses.
Joined 22 October 2024 · last posted 3d · groups: analytical-chemists
143Posts here
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[2026 update] Detection wavelength and why 214 nm and 280 nm disagree Replied, post #69 · Analytics › HPLC & UHPLC · 25 Jul 2026 · 4 likes Before anything else: what was the gradient, and at what wavelength? Area percent at different wavelengths is not the same number even on the same sample because…
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Revisiting: The best-written scientific paper you have read Replied, post #115 · Lounge › Off topic · 25 Jul 2026 · 10 likes Loosely related and not worth its own topic: the vocabulary here has leaked into how I read everything. I now notice when a press release gives a relative figure and no…
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Coming back to: Preparing for an appointment: one page, three questions Replied, post #10 · Clinical › Prescriber conversations · 17 Jul 2026 · 0 likes Prescription logistics: confirm whether it will be filled locally, requires mail order, or will be prescribed off-label and needs a compounding pharmacy. Different…
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Why the Start Here categories exist, and what they are not for Replied, post #8 · marked as the solution · Start Here › Welcome · 17 Jul 2026 · 7 likes Adding a reference point for Start. Mine is a single case, collected without controls, and I am posting the method alongside it so it can be discounted appropriately.
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What is genuinely unknown about long-term amylin agonism Replied, post #44 · Compounds › Cagrilintide & amylin analogues · 16 Jul 2026 · 0 likes On storage: aggregation-prone peptides are the ones where repeated warming and cooling does the most damage, and where a solution that looks fine may already have…
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Coming back to: Time to steady state after a dose increase Replied, post #102 · Pharmacology › Pharmacokinetics · 16 Jul 2026 · 0 likes Washout after stopping takes roughly the same four to five half-lives as reaching steady state. A month after the last dose is not the same as none.
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Follow-up: The most useful thing you learned here that was not the answer you came for Replied, post #26 · Lounge › Off topic · 15 Jul 2026 · 19 likes Since the Lounge tolerates a digression: the thing I find most interesting about this community is how much of the useful material is negative. Half the value is…
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What a certificate commits its issuer to — the long version Replied, post #23 · Analytics › COA interpretation · 13 Jul 2026 · 2 likes Picking up post #20: that is the part I would want checked first. A certificate is a statement by its issuer that a defined test was performed on a defined lot and…
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Reading a rodent study on a secretagogue without over-extrapolating — the long version Replied, post #36 · Compounds › Secretagogues & GH axis · 12 Jul 2026 · 1 like Worth separating two things that post #32 runs together. I would rather this thread reach "we do not know" about Reading a rodent study than reach a confident answer…
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Endotoxin and why it is a separate question from purity — what changed since Replied, post #69 · Analytics › Impurities & related substances · 7 Jul 2026 · 17 likes Disulfide formation: if a peptide contains cysteine, it can form disulfide bonds with itself or with other molecules. Under oxidising conditions multiple species…
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SURPASS-2 and the comparator dose question that will not go away — what changed since Replied, post #4 · Compounds › Tirzepatide · 4 Jul 2026 · 24 likes Coming back to post #2, because the follow-up matters more than the original answer. SURMOUNT-1 reported weight reduction of a magnitude that was the largest for a…
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Adolescents: a distinct evidence base Replied, post #3 · Clinical › Special populations · 3 Jul 2026 · 0 likes Adolescents: a distinct evidence base exists. The compounds are not approved for routine adolescent obesity but are being studied. Adolescent physiology and psychology…
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- LC-MS identity confirmationReview due 23 Mar 2027