peak_purity
TL3 Analytical chemist · Leiden, NL
Diode-array detection, peak purity, and the difference between "one peak" and "one compound".
Joined 30 July 2024 · last posted 9h · groups: analytical-chemists
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Trust level 3 requirements: a clarification — does this still hold? Replied, post #91 · Meta › Announcements · 28 Jul 2026 · 5 likes Staff announcements, policy changes, and scheduled maintenance. Read-only except for questions clarifying what was announced.
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Reflectance and photometric devices: precision in practice — a second dataset Replied, post #77 · Analytics › Home & field testing · 20 Jul 2026 · 0 likes What you can use home tests for: confirmation that a solution contains peptide (as opposed to being saline alone), rough screening for very different compounds…
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Follow-up: Reading an interaction checker output critically Replied, post #54 · Practice › Interactions · 19 Jul 2026 · 5 likes Separation timing versus clinically important interaction: a separation timing inconvenience (taking one medication 2 hours before or after another) is not the same as…
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Follow-up: Comparing two chromatograms from different laboratories, properly Replied, post #62 · Analytics › HPLC & UHPLC · 18 Jul 2026 · 11 likes This is why a purity figure without the underlying chromatogram is weaker evidence than it appears. It is also why two competent laboratories can report different…
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eGFR fluctuation and the creatinine denominator problem — the long version Replied, post #7 · Clinical › Bloodwork · 16 Jul 2026 · 26 likes Analytical imprecision: any measurement has an error margin. A small difference in consecutive tests is usually measurement noise, not a real change. Knowing the…
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What consumer-accessible tests can and cannot determine — a second dataset Replied, post #89 · Analytics › Home & field testing · 15 Jul 2026 · 8 likes Precision of home tests: most consumer-accessible devices are not precise to the level people want ("is this 99% pure or 97% pure"). They give a yes/no or a rough…
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Coming back to: Preparing for an appointment: one page, three questions Replied, post #2 · Clinical › Prescriber conversations · 15 Jul 2026 · 0 likes Picking up the opening post: that is the part I would want checked first. Prescription logistics: confirm whether it will be filled locally, requires mail order, or…
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Sulfonylureas: the interaction most worth taking seriously — what changed since Replied, post #6 · Practice › Interactions · 14 Jul 2026 · 4 likes Two things before anyone answers the substance. First, the context in the first post is clear and specific. Second, the question is framed so that an answer can…
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Osteoarthritis and mechanical versus metabolic improvement — one year on Replied, post #46 · Clinical › Comorbidities · 12 Jul 2026 · 0 likes Type 2 diabetes: the population with the largest evidence base for these compounds. The SURPASS and SUSTAIN programmes established glycaemic benefit. The renal and…
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Journal club: what we got wrong in an earlier session Replied, post #68 · Evidence › Journal club · 9 Jul 2026 · 3 likes I read post #66 twice before replying, because I had assumed the opposite. Critical appraisal template: (1) What did the trial set out to estimate? (2) Could the design…
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[2026 update] Temperature indicator cards: worth asking for? Replied, post #17 · Sourcing › Logistics · 8 Jul 2026 · 17 likes This follows post #14 rather than contradicting it. Declaring contents accurately: declaring accurately reduces intervention risk. A declaration of "peptide research…
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Second pass at: Metformin co-administration and additive GI effects Replied, post #142 · Practice › Interactions · 8 Jul 2026 · 13 likes Oral medications versus time: if you take an oral medication 30 minutes before semaglutide (which slows gastric emptying), the delayed stomach emptying affects when and…
Maintains 4 documents
- Mazdutide — referenceReview due 17 Oct 2026
- LC-MS identity confirmationReview due 23 Mar 2027
- System suitability testingReview due 1 Dec 2026
- Water content by Karl Fischer titrationReview due 7 Apr 2027