the HPLC thing finally clicked for me and I want to write it down
Something I noticed reading old threads that I have not seen said out loud.
The advice on integration 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
Three years on this site and the questions have not changed at all. Which is depressing or reassuring depending on the day.
This is the correct method framing. Column and gradient are load-bearing fields.
two labs, two different baselines, two different purity numbers, both honest
This is the correct method framing. Column and gradient are load-bearing fields.
axis labels included, always
axis labels included, always
Yes, exactly this, and it is the bit that took me 69 weeks to accept.
Edit to your parent would help — the concentration you quoted assumes one scenario and you have written another above it.
Three years on this site and the questions have not changed at all.
Adding to this: integration is doing more work than the comment implies.
Edit to your parent would help — the concentration you quoted assumes one scenario and you have written another above it.
Three years on this site and the questions have not changed at all.
Disagree on that part. 96.2% and 96.8% on the same vial is normal.
Strongly agree. Largest single impurity tells a different story than total purity.
Gradient goblin mode: changed the solvent composition 5 times, finally got good resolution on a chromatogram peak.
Gradient goblin mode: changed the solvent composition 5 times, finally got good resolution on a chromatogram peak.
Counter-anecdote: opposite result, same dose. Which mostly tells us the variance is huge.
two labs, two different baselines, two different purity numbers, both honest
This is the correct method framing. Column and gradient are load-bearing fields.
Water content matters more than people think. If a vial is carrying residual moisture, your "10mg" is not 10mg of peptide.
Injection volume and flow rate? Those affect resolution.
- 1Three years on this site and the questions have not changed at all. Which is…11 comments in this branch · started by u/joaquin_petrov
- 2Strongly agree. Largest single impurity tells a different story than total…8 comments in this branch · started by u/kofi_ferreira