c.nyberg
TL2 Moderator · Kumasi
Contributes reviews on supplier material. Based in Kumasi.
Joined 9 March 2025 · last posted 20d
84Posts here
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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 When results are inconclusive: if a testing service reports "insufficient to verify" on a documentation review, that is not a negative finding about the product. It…
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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 Immunoassay limitations: tests that use antibodies have cross-reactivity limitations. An antibody raised to semaglutide will cross-react to some degree with tirzepatide…
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Charge states for a 4 kDa peptide, worked through Replied, post #106 · Analytics › Mass spectrometry · 14 Mar 2025 · 32 likes Mass accuracy is expressed in parts per million. It is the difference between observed and theoretical mass divided by theoretical mass, multiplied by a million. A…
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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 Precision and repeatability: within-run and between-run variability of the method. Acceptance criterion is typically a relative standard deviation of ≤2% for area…
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Column chemistry choices for a 40-residue peptide Replied, post #14 · Analytics › HPLC & UHPLC · 16 Aug 2025 · 31 likes Having read the exchange above, I think I was wrong earlier in this topic and I want to say so plainly rather than quietly editing. The correction was fair and I had…
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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 The 165 to 184 hour range: that is roughly 7 to 7.6 days, which is why the weekly schedule works. Below 4 half-lives you are not approaching steady state yet, which is…
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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 |
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| 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 |
| De-escalator | gold | 12 Jan 2026 |
| Anniversary | silver | 9 Mar 2026 |