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
144Posts 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 If two laboratories disagree by more than two or three percentage points, work through method, integration, sample handling, whether it was the same lot and the same…
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Revisiting: The best-written scientific paper you have read Replied, post #115 · Lounge › Off topic · 25 Jul 2026 · 10 likes Off-topic but genuinely curious: how many people here came in through the analytics side rather than the practical side? The two groups seem to read completely…
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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 · Start Here › Welcome · 17 Jul 2026 · 0 likes Marked solutions are the site's way of saying that someone asked a good question and someone else gave an answer that actually worked. It is not a competition and it…
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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 This settles it for me, at least until somebody posts a reason it should not.
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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 Between-person variability in exposure is substantial and is the reason two people on the same dose can have quite different plasma concentrations. That is inherent…
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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 Confirming post #20 from a second method, which matters more than confirming it from a second person. Asking for the batch record rather than the certificate is a…
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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 On post #32 — agreed on the reasoning, with one qualification. I would rather this thread reach "we do not know" about Reading a rodent study than reach a confident…
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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 Truncation products: fragments from incomplete synthesis or from degradation. They elute quite differently from the intact peptide because they are much smaller and…
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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 Quietly grateful for the plain phrasing. Not every thread gets that.
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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