a.nascimento
TL2 Moderator · Setúbal
Contributes reviews on supplier material. Based in Setúbal.
Joined 19 February 2025 · last posted 3h
84Posts here
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Adducts: sodium, potassium, and the peak you did not expect — does this still hold? Replied, post #101 · Analytics › Mass spectrometry · 9 Apr 2026 · 29 likes Electrospray ionisation produces multiply charged ions. For a 4 kDa peptide you expect mostly 2+, 3+, and 4+ charge states. Reading an electrospray spectrum means…
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Packaging that arrived damaged: documenting it properly — a second dataset Replied, post #5 · Sourcing › Logistics · 7 Dec 2025 · 29 likes Cold packs and temperature control: inclusion of cold packs at despatch is standard. Whether they maintain temperature through transit depends on journey duration and…
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Follow-up: A supplier that answers analytical questions with restated claims Replied, post #50 · Sourcing › Red flags · 14 Jan 2026 · 28 likes post #49 is right about the mechanism and I think understates the practical bit. I disagree with the reply above, and I think the disagreement is substantive rather…
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Converting between mg/mL and units per dose, both directions — the long version Replied, post #10 · Practice › Reconstitution · 17 Apr 2026 · 27 likes Choosing a concentration on purpose rather than by accident: starting with "I want to draw 0.5 mL per dose" and working backward to the required concentration is more…
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[2026 update] New subcategory: rationale and scope Replied, post #68 · Meta › Announcements · 15 Dec 2024 · 25 likes post #67 answers the question as asked. The question underneath it is different. Notifications: watching this subcategory means you receive notifications when…
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Carryover and the ghost peak from last week's standard Replied, post #11 · Analytics › HPLC & UHPLC · 2 Apr 2025 · 24 likes System suitability testing: injections run before and during the sample run to establish whether the instrument, column and method were performing when the sample was…
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Badges earned, in order
| Badge | Tier | Granted |
|---|---|---|
| Basic User | bronze | 21 Feb 2025 |
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| Good Post | silver | 31 May 2025 |
| Sourced | bronze | 12 Jun 2025 |
| Consistently Generous | silver | 25 Jun 2025 |
| Welcoming | silver | 15 Jul 2025 |
| Thank You | silver | 31 Jul 2025 |
| Gives Back | gold | 20 Oct 2025 |
| De-escalator | gold | 21 Nov 2025 |
| Anniversary | silver | 19 Feb 2026 |