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system_suitability

TL3 Analytical chemist · Cork, IE

If the suitability injections failed, the run did not happen. That is most of my contribution here.

Joined 6 February 2025 · last posted 3d · groups: analytical-chemists

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system suitabilityGLP

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  • Alcohol: what is documented and what is folklore Replied, post #133 · Practice › Interactions · 25 Jul 2026 · 28 likes Picking up post #130: that is the part I would want checked first. Thyroid medications: semaglutide is associated with a slowing of gastric emptying, which might affect…
  • Second pass at: What a 2 ppm match establishes, and what it does not Replied, post #48 · Analytics › Mass spectrometry · 23 Jul 2026 · 0 likes Calibration matters: a high-resolution instrument out of calibration can report mass with ppm error large enough to be uninformative. Check when the instrument was last…
  • A pooled estimate that changed when one trial was added Replied, post #27 · Evidence › Meta-analyses · 22 Jul 2026 · 0 likes Inclusion and exclusion criteria: a meta-analysis is only as good as its inclusion criteria. If the criteria are too broad, apples and oranges get pooled. If they are…
  • Revisiting: The best-written scientific paper you have read Replied, post #107 · Lounge › Off topic · 21 Jul 2026 · 14 likes Not a rules-free zone: the guidelines still apply. No phones, no Telegram, no endorsements of other communities. Just a relaxed bar for how directly the topic needs to…
  • [2026 update] Detection wavelength and why 214 nm and 280 nm disagree Replied, post #57 · Analytics › HPLC & UHPLC · 21 Jul 2026 · 0 likes Area percent is not mass percent. It is a proportion of absorbance, weighted by each species' extinction coefficient. For closely related impurities the approximation…
  • What a certificate commits its issuer to Replied, post #36 · Analytics › COA interpretation · 15 Jul 2026 · 31 likes On post #32 — agreed on the reasoning, with one qualification. Purity and content are different measurements: purity tells you what proportion of the detected material…
  • Reading a home test result without over-claiming Replied, post #119 · Analytics › Home & field testing · 14 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…
  • A structured critique template this community uses — a second dataset Replied, post #35 · Evidence › Study critique · 11 Jul 2026 · 3 likes Defending a paper against criticism: if the authors respond, they might clarify something the paper explained poorly. Their response might also miss your point. Either…
  • The anatomy of a question that gets answered within an hour Replied, post #108 · Start Here › How to Ask · 11 Jul 2026 · 11 likes Worth separating two things that post #104 runs together. Disagreeing with an answer you got: cite what you disagree with, say what contradicts it, and ask which one…
  • Revisiting: Why the absence of controlled human data on BPC-157 matters more than people… Replied, post #24 · Compounds › Repair & healing peptides · 11 Jul 2026 · 1 like I disagree with the reply above, and I think the disagreement is substantive rather than terminological. The distinction being drawn does not survive when you look at…
  • What to bring: records that a clinician can actually use — a second dataset Replied, post #9 · Clinical › Prescriber conversations · 5 Jul 2026 · 9 likes On post #5 — agreed on the reasoning, with one qualification. Preparing for an appointment: bring recent bloodwork, a list of current medications with doses and timing,…
  • Alcohol: what is documented and what is folklore Replied, post #93 · Practice › Interactions · 4 Jul 2026 · 23 likes Worth separating two things that post #89 runs together. Vitamins: most vitamins have no significant interaction. Fat-soluble vitamins (A, D, E, K) might be affected by…

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