t.dumitru

TL2 Moderator · Rosario

Contributes reviews on supplier material. Based in Rosario.

Joined 3 October 2024 · last posted 7d

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Forced degradation studies: designing one that is informative Replied, post #103 · Analytics › Method validation · 21 Jul 2026 · 1 like Limits of detection and quantitation: LOD is the lowest concentration that produces a signal above background. LOQ is the lowest concentration at which the method meets…
A structured critique template this community uses — a second dataset Replied, post #42 · Evidence › Study critique · 18 Jul 2026 · 11 likes Coming back to post #40, because the follow-up matters more than the original answer. Confounding: in observational data, is there a third variable that explains the…
What consumer-accessible tests can and cannot determine — a second dataset Replied, post #60 · Analytics › Home & field testing · 7 Jul 2026 · 31 likes Worth separating two things that post #56 runs together. Why third-party testing is stronger: a home test run by the person who made the compound is a self-selected…
Micro-titration: a disputed topic, argued properly — one year on Replied, post #58 · Practice › Dosing & titration · 3 Jul 2026 · 12 likes post #57 answers the question as asked. The question underneath it is different. Thank you for the correction. I have edited my earlier post with a note rather than…
Angle of injection and whether 90 degrees is always right — the long version Replied, post #35 · Practice › Administration · 30 Jun 2026 · 5 likes Bleeding at the injection site: normal and usually minimal. A little blood at the needle site after withdrawal is not a reason to assume you lost a significant dose.…
Secretagogues and glucose tolerance: the mechanistic concern Replied, post #55 · Compounds › Secretagogues & GH axis · 30 Jun 2026 · 23 likes On post #51 — agreed on the reasoning, with one qualification. Pulsatile secretion matters because growth hormone is secreted in pulses, not continuously. A single…
Specificity, linearity, accuracy, precision, range, robustness — with real criteria Replied, post #36 · Analytics › Method validation · 28 Jun 2026 · 0 likes Forced degradation studies: deliberately stress the material with acid, base, oxidant, heat, light to generate degradation products and demonstrate that the method can…
Publication patterns in the BPC-157 literature, examined Replied, post #23 · Compounds › Repair & healing peptides · 28 Jun 2026 · 20 likes Stability of BPC-157 in solution: what has been measured in published work covers specific formulations under specific conditions. Extrapolating to a reconstituted…
Manufacturer assistance programmes and their eligibility rules Replied, post #37 · Access › Pricing · 26 Jun 2026 · 14 likes On post #33 — agreed on the reasoning, with one qualification. Cost per milligram is the only comparison that survives format differences, but even then it needs care.…
Revisiting: Theoretical plates: useful number or ritual? Replied, post #12 · Analytics › HPLC & UHPLC · 9 Jun 2026 · 0 likes post #11 answers the question as asked. The question underneath it is different. Reversed-phase separates on hydrophobicity. A peptide is retained on a non-polar…
Racemisation and why it is invisible to a mass measurement Replied, post #23 · Analytics › Impurities & related substances · 9 Jun 2026 · 0 likes post #22 is right about the mechanism and I think understates the practical bit. Related substances: compounds chemically related to the target peptide but not the…
An 18-month record including the parts that went badly Replied, post #28 · Outcomes › Progress reports · 30 May 2026 · 27 likes Rate of change: reporting progress as "lost 5 kg in 12 weeks" is more useful than "currently at 82 kg" because the rate tells you whether the change is steady,…