integration

chromatogram is doing more work than we give it credit for — a position I have arrived at slowly and would like tested. A shoulder that does not baseline-resolve cannot…

the LC-MS rule is doing its job and people should stop complaining — posting the reasoning in public because a policy you cannot inspect is just a preference. The…

The title is the argument: method development is the most under-discussed thing on this board. Here is the rest of it. Area percent is the integrated area of your peak…

The title is the whole question — how much of what we believe about HPLC actually comes from method development threads — but here is why I am asking. KP sent me the…

The title is the argument: we are measuring HPLC at the wrong time and calling it noise. Here is the rest of it. Area percent is the integrated area of your peak over…

Short version of the title, which is already short: split one vial across Janoshik and Medutest — 98.7% and 98.3%. Longer version underneath. Since the title puts…

the chromatogram advice in here is 2 years out of date — a position I have arrived at slowly and would like tested. Numbers, in the order they matter: 2 years.…

method development — 13 things I got wrong before I got it right. Not a hot take, just something I have not seen said plainly here. Ran a blank after a…

proposal — a flair for LC-MS posts. Short post, long comment section, probably. QYB sent me the column, the gradient and the theoretical mass without being asked. That…

CPC cagri — Janoshik came back 98.1% against a claimed 97.5%. One vial, one service, one member paying, which is the only kind of result this board should treat as…

genuine question about LC-MS that I am slightly embarrassed to ask. Searched first, found three threads that contradict each other, hence the post. Resolution between…

Asking properly rather than in a comment on somebody else’s thread: how do you actually verify method development. The system suitability argument, since it comes up…

can we stop arguing about HPLC until somebody posts a number. I am not trying to be the "source?" guy. I would just like a source. System suitability — repeat…

The one-line version is the title: why amino acid analysis catches the frauds HPLC misses. The rest is why. Carryover from a previous high-concentration injection looks…

Numbers in the title, numbers in the post. 16th independent test on ERP — 97.4% on a claimed 97.0%, and the trend is the interesting part. Since the title puts numbers…

Posting this as a discussion rather than a claim: unpopular opinion: most of what gets said here about HPLC is guesswork. Retention time shifted 0.4 minutes and I…

chromatogram is the most under-discussed thing on this board. I have gone back and forth on this for months. System suitability — repeat injections, tailing factor,…

Short version of the title, which is already short: split one vial across VendorInvestigate and PeptideMeter — 98.6% and 98.4%. Longer version underneath. Figures up…

how much of what we believe about HPLC actually comes from LC-MS threads. Searched first, found three threads that contradict each other, hence the post. Chased a ghost…

Genuine question, and the title is the question: how much of what we believe about HPLC actually comes from integration threads. Started reporting my own integrations…

The title is the argument: we are measuring LC-MS at the wrong time and calling it noise. Here is the rest of it. SWB sent me the column, the gradient and the…

is 96.8% actually fine or am I being sold a rounding error, and before anyone asks: same batch throughout, single submission, no cherry-picking between services. 96.8%…

how do you actually verify purity — that is what I am asking, and I have already read the wiki twice. Mass spectrometry answers identity. UV purity answers relative…

Trying to get a straight answer on this: does gradient actually matter or is it forum lore at this point. A shoulder that does not baseline-resolve cannot be quantified…

three years of method development threads, summarised so you do not have to read them. Making the case below, and I expect to lose some of it in the comments. Started…