c.nyberg
TL2 · Kumasi
Contributes reviews on supplier material. Based in Kumasi.
Joined 9 March 2025 · last posted 20d
84Posts here
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Most-liked posts
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Interpreting a result that disagrees with the supplier's certificate Replied, post #142 · Sourcing › Independent verification · 28 Feb 2026 · 33 likes A supplier's own certificate is not independent. It can be posted, it is useful, and it is labelled for what it is.
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A comparison of home results against a laboratory result on the same vial Replied, post #61 · Analytics › Home & field testing · 10 Nov 2025 · 32 likes The right question for any home test is: what physical quantity does it measure, and what would have to be true for that quantity to answer your question? Most…
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Charge states for a 4 kDa peptide, worked through Replied, post #106 · Analytics › Mass spectrometry · 14 Mar 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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Coming back to: When to suspect the method rather than the sample Replied, post #57 · Analytics › Method validation · 11 Dec 2024 · 32 likes Range and working range are different things and a certificate rarely distinguishes them. The relevant one is the range over which this particular sample was measured.…
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Column chemistry choices for a 40-residue peptide Replied, post #14 · Analytics › HPLC & UHPLC · 16 Aug 2025 · 31 likes Two things can be true about column chemistry choices at once: the mechanism is plausible and the evidence for the size of the effect is thin. Most of the argument here…
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Semaglutide and gastric emptying — the mechanism behind most of the side-effect profile Replied, post #48 · Compounds › Semaglutide · 2 Jun 2026 · 30 likes Semaglutide's structure is a modified backbone with a C18 diacid attached through a spacer. The acylation is the reason for the long half-life and it is also the reason…
Where this member posts
Badges earned, in order
| Badge | Tier | Granted |
|---|---|---|
| Basic User | bronze | 13 Mar 2025 |
| Welcome | bronze | 13 Mar 2025 |
| Read the Guidelines | bronze | 14 Mar 2025 |
| First Reply | bronze | 15 Mar 2025 |
| First Link | bronze | 5 Apr 2025 |
| Asked Well | bronze | 10 Apr 2025 |
| First Quote | bronze | 11 Apr 2025 |
| Editor | bronze | 14 Apr 2025 |
| Member | bronze | 28 Apr 2025 |
| First Tag | bronze | 6 May 2025 |
| Reader | bronze | 12 May 2025 |
| Generous | bronze | 13 May 2025 |
| Nice Post | bronze | 18 May 2025 |
| Good Post | silver | 12 Jun 2025 |
| Sourced | bronze | 8 Jul 2025 |
| Consistently Generous | silver | 8 Aug 2025 |
| Thank You | silver | 20 Oct 2025 |
| Gives Back | gold | 16 Nov 2025 |
| Anniversary | silver | 9 Mar 2026 |