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c/hplc·submitted 3 months ago by u/dead_space_doug

help me understand chromatogram, I have read the wiki twice

Methodbranch of 6 comments

I have had 12 orders now and I keep a table, so here is the honest summary rather than a vibe. Material has been consistent. Communication has not. Shipping has varied by about 28 days on nominally the same lane, which matters more in summer than in February. The independent number came back 93.7% against a claimed…

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6 comments, started 3 months ago
u/sofia_petrescu4 points·3 months ago

Yeah, the chromatogram profile matters more than the headline number.

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[deleted]3 points·3 months ago

[deleted]

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u/peak_area_peteanalytical2 points·3 months ago

Slight fix: the number was 99.1, not 99.2. Decimal point, but a fairly consequential one.

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u/andres_restrepo1 point·3 months ago

the detector wavelength matters more than people think

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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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