integration

Right: split one vial across PeptideMeter and VendorInvestigate — 93.7% and 94.2%. I paid for this one myself, nobody sent me anything, and the receipts are in the…

Numbers in the title, numbers in the post. QSC cagri — Janoshik came back 98.6% against a claimed 98.5%. Pulling the figures out of the title: 98.6% and 98.5%. All of…

Genuine question, and the title is the question: does chromatogram actually matter or is it forum lore at this point. UV response is not uniform across species. At…

Numbers in the title, numbers in the post. 18th independent test on SWB — 99.4% on a claimed 99.0%, and the trend is the interesting part. Numbers, in the order they…

Short version of the title, which is already short: WXT cagri — PeptideMeter came back 97.8% against a claimed 97.0%. Longer version underneath. Since the title puts…

integration is the most under-discussed thing on this board. Not a hot take, just something I have not seen said plainly here. Ran a blank after a high-concentration…

The claim in the title is exactly the claim I am making: MKM cagri — Medutest came back 97.2% against a claimed 97.0%. Nothing implied beyond it. Since the title puts…

Asking properly rather than in a comment on somebody else’s thread: help me understand method development, I have read the wiki twice. A shoulder that does not…

Genuine question, and the title is the question: how do you actually verify gradient. Sent the same vial to PeptideMeter and Medutest. 98.2% against a claimed 97.5%.…

The claim in the title is exactly the claim I am making: is 94.2% actually fine or am I being sold a rounding error. Nothing implied beyond it. Figures up front so…

Title says it — split one vial across PeptideMeter and VendorInvestigate — 96.8% and 99.1% — so here is the boring supporting detail that makes it worth anything. The…

Result first, context after: ERP cagri — PeptideMeter came back 98.8% against a claimed 98.0% . Everything below is how it was ordered, stored and sent. Numbers, in the…

The title is the whole question — help me understand LC-MS, I have read the wiki twice — but here is why I am asking. Area percent is the integrated area of your peak…

the method development rule is doing its job and people should stop complaining. Disagreement welcome, but bring a concrete alternative wording. Why two honest labs…

Genuine question, and the title is the question: why does nobody talk about gradient. UV response is not uniform across species. At 214nm you are looking at the peptide…

how much of what we believe about HPLC actually comes from gradient threads, and I want the answer with the reasoning attached rather than just the conclusion. Gave the…

Question in the title, detail here: genuine question about HPLC that I am slightly embarrassed to ask. MKM sent me the column, the gradient and the theoretical mass…

Title says it — KP cagri — VendorInvestigate came back 98.1% against a claimed 97.5% — so here is the boring supporting detail that makes it worth anything. 98.1% and…

HJ cagri — Janoshik came back 97.5% against a claimed 97.0%, and before anyone asks: same batch throughout, single submission, no cherry-picking between services. The…

Trying to get a straight answer on this: someone explain HPLC to me like I have not read a paper in years. The system suitability argument, since it comes up whenever…

integration — 22 things I got wrong before I got it right. It is the sort of thing everyone half-believes and nobody writes down. Resolution between two peaks depends…

Genuine question, and the title is the question: how much of what we believe about gradient actually comes from purity threads. UV response is not uniform across…

purity — 19 things I got wrong before I got it right, which sounds obvious until you try to state the evidence for it. Area percent is the integrated area of your peak…

Right: MKM cagri — Medutest came back 97.7% against a claimed 97.0%. I paid for this one myself, nobody sent me anything, and the receipts are in the comments. The…

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