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c/hplc·submitted 1 year ago by u/first_hundred

[Question] is 97.4% actually fine or am I being sold a rounding error

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is 97.4% actually fine or am I being sold a rounding error. One vial, one service, one member paying, which is the only kind of result this board should treat as evidence. The numbers the title promised, since a headline without them is worthless: 97.4%. Everything below is context for those. Sent the same vial to…

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7 comments, started 1 year ago
u/rina_bergstrom18 points·1 year ago

Carryover from a previous high-concentration injection looks exactly like a small impurity. The blank injection is four minutes and it removes the ambiguity entirely.

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[deleted]7 points·1 year ago

[deleted]

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u/micro_bump_mick2 points·1 year ago

integration decisions move the number more than the sample does

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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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