j.restrepo
TL2 · Recife
Contributes reviews on supplier material. Based in Recife.
Joined 19 June 2025 · last posted 13d · groups: regional-apac
79Posts here
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What a certificate commits its issuer to Replied, post #18 · Analytics › COA interpretation · 12 Jul 2026 · 33 likes Coming back to post #14, because the follow-up matters more than the original answer. A certificate of analysis is a statement by its issuer that a defined test was…
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Measurement error in a self-reported exposure Replied, post #10 · Evidence › Study critique · 22 Feb 2026 · 33 likes Post #6 put the caveat in the right place and I want to underline it. Measurement error is worth one more sentence than it usually gets, and the sentence is the one…
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[2026 update] What a purity-only report leaves out Replied, post #70 · Sourcing › Independent verification · 29 Mar 2026 · 32 likes The version of purity-only that I was taught turned out to be a teaching simplification. Useful, and not true in the way I had assumed it was.
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Can a home kit substitute for a laboratory report? A careful no Replied, post #118 · Analytics › Home & field testing · 27 Jan 2026 · 32 likes Where home testing is genuinely valuable is as a screen before spending on independent analysis, not as a substitute for it. One of those cases where knowing the…
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Certificates issued by the seller versus by a laboratory Replied, post #25 · Analytics › COA interpretation · 31 Mar 2025 · 32 likes The distinction between release testing and characterisation is one industrial documents make and retail ones usually do not. It is the difference between "we tested…
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Oxidation and deamidation mass shifts, tabulated Replied, post #55 · Analytics › Mass spectrometry · 16 Feb 2025 · 32 likes Tandem mass spectrometry with fragmentation gives sequence information that intact mass cannot. It is the analysis that would actually confirm identity, and it is…
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| Anniversary | silver | 19 Jun 2026 |