h.espinoza
TL2 · Monterrey
Contributes reviews on supplier material. Based in Monterrey.
Joined 11 December 2024 · last posted 19h
80Posts here
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Why quantitation is the hard part, not detection Replied, post #3 · Analytics › Home & field testing · 30 Dec 2024 · 31 likes Source for the quantitation figure, since it was asked for. It is in the discussion rather than the abstract, which is why the version circulating is stronger than the…
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Checking someone else's arithmetic: a worked example thread Replied, post #63 · Practice › Reconstitution · 2 Jul 2025 · 30 likes I read post #62 twice before replying, because I had assumed the opposite. Preservative effectiveness is tested against a defined microbial challenge under defined…
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Requesting a page: what makes a good request — what changed since Replied, post #49 · Documentation › Wiki requests · 10 Oct 2024 · 30 likes The arithmetic in post #48 is right; the assumption feeding it is the part to check. Link the topics that prompted the request. The discussion is the evidence that the…
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Review: a draft on reconstitution arithmetic, with objections Replied, post #78 · Documentation › Doc review · 28 Mar 2025 · 29 likes Second this, and I would have said it less carefully.
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A reconstituted vial's beyond-use date and the reasoning behind common figures Replied, post #66 · Practice › Storage & stability · 6 Jun 2026 · 26 likes I had written a reply contradicting post #64 and deleted it. Here is what survived. Reconstituted material carried in a bag for a day is a temperature excursion even in…
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Adducts: sodium, potassium, and the peak you did not expect Replied, post #36 · Analytics › Mass spectrometry · 16 Mar 2025 · 26 likes Quantitation by MS: most quantitation is done by LC-UV detection at 214 nm, not by MS, because extinction coefficients are better known. MS can quantify if an internal…
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