batch

area percent — 13 things I got wrong before I got it right — a position I have arrived at slowly and would like tested. LC-MS gives you identity; UV purity gives you a…

we are measuring certificate of analysis at the wrong time and calling it noise. Change my mind, genuinely — I have no stake in being right about this. Water content…

7th independent test on WXT — 99.2% on a claimed 98.5%, and the trend is the interesting part. That is the headline. The document, the batch and the service are below…

Asking properly rather than in a comment on somebody else’s thread: how do you actually verify Janoshik. On inter-lab disagreement, which generates more heat here than…

Genuine question, and the title is the question: can we stop arguing about COA until somebody posts a number. Spent four months confusing area% and mass% in every post…

Slightly embarrassed to be asking this, but: purity — what am I missing here. My first certificate had a compound name, a percentage and a logo. I thought that was…

reading below spec threads from 2024 and half of it aged badly. Not a hot take, just something I have not seen said plainly here. CPC BPC, batch matched the paperwork,…

the batch advice in here is 3 years out of date. It is the sort of thing everyone half-believes and nobody writes down. The relevant figures are 3 years, and they come…

unpopular opinion: most of what gets said here about water content is guesswork, and I am aware this is a minority view on this board. UV at 214nm sees the peptide bond…

area percent — what am I missing here. Searched first, found three threads that contradict each other, hence the post. Asked QSC for the batch-specific certificate and…

Question in the title, detail here: do test results actually matter or is it forum lore at this point. Have now spent more on testing than on some of the orders. No…

Slightly embarrassed to be asking this, but: Janoshik — what am I missing here. A series across separate lots estimates a process. Repeat tests on one lot estimate the…

The title is the whole question — someone explain COA to me like I have not read a paper in years — but here is why I am asking. The PDF creation date being later than…

Posting this because the title is the whole finding — KP vs BCH on the same compound, same month — both cleared 97.5% — and a number without its method is a rumour.…

The title is the whole question — how much of what we believe about area percent actually comes from COA threads — but here is why I am asking. Started keeping a folder…

does purity actually matter or is it forum lore at this point. Searched first, found three threads that contradict each other, hence the post. Asked QST for the…

The claim in the title is exactly the claim I am making: split one vial across VendorInvestigate and PeptideMeter — 99.1% and 96.8%. Nothing implied beyond it. Numbers,…

proposal — a flair for water content posts. Nothing about this affects the ranking maths, before anyone asks. Ask what the stability statement was written against —…

The title is the argument: purity is doing more work than we give it credit for. Here is the rest of it. The PDF creation date being later than the analysis date is…

how much of what we believe about purity actually comes from PeptideMeter threads — that is what I am asking, and I have already read the wiki twice. First result I…

purity is not what most of this community thinks it is. Two minutes of reading now saves an argument later. My first certificate had a compound name, a percentage and a…

The title is the argument: unpopular opinion: most of what gets said here about COA is guesswork. Here is the rest of it. The PDF creation date being later than the…

the below spec advice in here is 2 years out of date. I have gone back and forth on this for months. The numbers the title promised, since a headline without them is…

Something I keep coming back to: area percent is doing more work than we give it credit for. Spent four months confusing area% and mass% in every post I made here. One…

Janoshik is not what most of this community thinks it is. If you already knew this, the post is not for you and you can scroll on. FGP BPC, batch matched the paperwork,…