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c/hplc·submitted 2 years ago by u/santiago_villalobos

8 months in and chromatogram is still the thing I get wrong

Explainerbranch of 4 comments

I have had 10 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 32 days on nominally the same lane, which matters more in summer than in February. The independent number came back 98.4% against a claimed…

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4 comments, started 2 years ago
u/valeria_cardoso627 points·2 years ago

a round-robin on baseline integration would be genuinely useful

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u/peak_area_peteanalytical429 points·2 years ago

chromatogram or it did not happen

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u/santiago_villalobosOP366 points·2 years ago

Disagree but this is the good kind of wrong — it is specific enough to be checked.

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u/hana_lehtinen491 points·2 years 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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