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c/hplc·submitted 7 months ago by u/samir_falk

does LC-MS actually matter or is it forum lore at this point

Discussionbranch of 4 comments

Quick one. Canada here. chromatogram works very differently where I live than in the threads that dominate the front page, and I keep seeing people confidently given advice that simply does not apply outside the US. Specifics: the route I used took 18 weeks and cost roughly what I expected. The admin was worse than…

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4 comments, started 7 months ago
u/hedda_ekstrom6 points·7 months ago

Strongly agree. Largest single impurity tells a different story than total purity.

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u/sig_figs_sammod · analytical3 points·7 months ago

Did they post the raw trace or just the summary?

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u/camila_lindqvist4 points·7 months ago

Strongly agree.

Disagree on that part. 97.4% and 97.6% on the same vial is normal.

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u/isabela_nilsen1 point·7 months ago

two labs, two different baselines, two different purity numbers, both honest

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The analytical deep end: RP-HPLC methods, gradient design, integration decisions, LC-MS confirmation, amino-acid analysis, water content, and why two labs can report 98.1% and 96.4% on the same vial and both be right. Post the chromatogram, not the summary line.

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