what would you tell week-1 you about method development
Something I noticed reading old threads that I have not seen said out loud.
The advice on purity in this community changed substantially around the start of last year, and nobody went back and updated the older posts. So depending on which thread the search engine hands you, you get two contradictory answers with the same confidence.
I have listed what I think the current consensus is below. Correct me — that is the point of posting it.
best — the order this archive was captured in
This is the correct method framing. Column and gradient are load-bearing fields.
Did they post the raw trace or just the summary?
Water content matters more than people think. If a vial is carrying residual moisture, your "10mg" is not 10mg of peptide.
The related substances profile is way more interesting than the main peak %. A 98% with 22 peaks is different from a 98% that is one 30% impurity.
Gradient goblin mode: changed the solvent composition 8 times, finally got good resolution on a integration peak.
Detection wavelength? HPLC and that changes at different wavelengths.
No. This is the kind of confident post that gets copied into a screenshot and repeated for years. Where is the evidence.
[deleted]
Retitled to remove editorialising. Put the evidence in the body.
Disagree. What you are describing is consistent with integration, not with what you concluded.
area% and mass% are not the same and this whole post conflates them
area% and mass% are not the same and this whole post conflates them
Yes, exactly this, and it is the bit that took me 79 weeks to accept.
This is the correct method framing. Column and gradient are load-bearing fields.
- 1Gradient goblin mode: changed the solvent composition 8 times, finally got…5 comments in this branch · started by u/nora_lundgren
- 2Retitled to remove editorialising. Put the evidence in the body.5 comments in this branch · started by u/peak_area_pete