j.restrepo

TL2 Moderator · Recife

Contributes reviews on supplier material. Based in Recife.

Joined 19 June 2025 · last posted 13d · groups: regional-apac

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Tirzepatide storage and stability: what is published versus what is assumed Replied, post #18 · Compounds › Tirzepatide · 15 Jul 2026 · 0 likes This follows post #15 rather than contradicting it. SURMOUNT-1 reported weight reduction of a magnitude that was the largest for a pharmacological intervention at that…
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…
Transit times by route, from a logged dataset Replied, post #3 · Sourcing › Logistics · 11 Jul 2026 · 22 likes Insurance and carrier liability: most parcel carriers limit liability. Understanding the limits before choosing a carrier matters if you are shipping expensive material.
Journal club: SUSTAIN 6 and its retinopathy signal Replied, post #20 · Evidence › Journal club · 3 Jul 2026 · 19 likes 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…
Reading order for a first week here, and what to skip until later — what changed since Replied, post #9 · Start Here › Welcome · 3 Jul 2026 · 1 like Worth separating two things that post #5 runs together. Nothing here requires expertise. The experienced members here got that way by posting questions, not by knowing…
What would change my mind about repair peptides: a specific answer Replied, post #16 · Compounds › Repair & healing peptides · 27 Jun 2026 · 0 likes Analytical identity of BPC-157: a 15-residue peptide with an unambiguous mass (≈1419.5 Da). Identity confirmation by LC-MS is trivially easy, which means there is no…
Coming back to: Why a preprint's supplementary material is often the best part Replied, post #85 · Evidence › Preprints · 21 Jun 2026 · 19 likes post #84 is right about the mechanism and I think understates the practical bit. Server repositories: medRxiv for medicine, bioRxiv for biology. Preprints on these…
Why retatrutide discussion here is more cautious than elsewhere — one year on Replied, post #10 · Compounds › Retatrutide · 21 Jun 2026 · 0 likes I read post #8 twice before replying, because I had assumed the opposite. Dose escalation in the published trials: the protocols started at lower doses and escalated by…
Second pass at: What a 2 ppm match establishes, and what it does not Replied, post #31 · Analytics › Mass spectrometry · 20 Jun 2026 · 16 likes Purity and identity are different questions: LC-MS establishes that the species at a retention time has the expected mass. It does not establish how much of the sample…
Injecting into an area that has become firm: why not to Replied, post #92 · Practice › Administration · 17 Jun 2026 · 0 likes On post #88 — agreed on the reasoning, with one qualification. Cold solution and stinging: warming the vial in your hands for a minute before injection reduces the…
Named, unnamed and unspecified impurities as regulatory categories — the long version Replied, post #5 · Analytics › Impurities & related substances · 16 Jun 2026 · 0 likes Aggregates: multiples of the monomer mass. May not elute at all under a standard reversed-phase method. A species that does not come off the column does not appear in…
Injecting into an area that has become firm: why not to Replied, post #77 · Practice › Administration · 15 Jun 2026 · 12 likes Angle of injection: 90 degrees into pinched tissue ensures subcutaneous placement. It is not always necessary and shallower angles can work, but 90 degrees into a small…