j.restrepo
TL2 Moderator · 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 Worth separating two things that post #14 runs together. Amino acid analysis gives content: it hydrolyses the peptide and quantifies the residues. It measures the…
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Measurement error in a self-reported exposure Replied, post #10 · Evidence › Study critique · 22 Feb 2026 · 33 likes Worth separating two things that post #6 runs together. Building consensus on which criticisms matter: if everyone agrees that the sample size is small but only you…
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[2026 update] What a purity-only report leaves out Replied, post #70 · Sourcing › Independent verification · 29 Mar 2026 · 32 likes Blind sampling: submitting without the laboratory or seller knowing the source removes the two easiest ways for a result to be shaped: selective submission and…
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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 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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Certificates issued by the seller versus by a laboratory Replied, post #25 · Analytics › COA interpretation · 31 Mar 2025 · 32 likes Counter-ion form is crucial: peptides are isolated as salts, most often trifluoroacetate from reversed-phase purification or acetate after salt exchange. The…
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Oxidation and deamidation mass shifts, tabulated Replied, post #55 · Analytics › Mass spectrometry · 16 Feb 2025 · 32 likes Charge states observed: for semaglutide (4113.6 Da) the doubly charged ion appears at m/z ≈ 2057, triply charged at ≈ 1371, quadruply at ≈ 1029. Those are the positions…
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Badges earned, in order
| Badge | Tier | Granted |
|---|---|---|
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| Anniversary | silver | 19 Jun 2026 |
| De-escalator | gold | 27 Jul 2026 |