purity

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…

The claim in the title is exactly the claim I am making: WXT vs JEEP on the same compound, same month — both cleared 97.0%. Nothing implied beyond it. Pulling 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…

Result first, context after: GL Biochem vs GGPeps on the same compound, same month — both cleared 97.5% . Everything below is how it was ordered, stored and sent.…

purity is the most under-discussed thing on this board. Not a hot take, just something I have not seen said plainly here. Net peptide content is the fraction of the…

why does nobody talk about water content. Searched first, found three threads that contradict each other, hence the post. Asked for the storage condition behind the…

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…

Housekeeping: the area percent rule is doing its job and people should stop complaining. Water content 3.8%, acetate 6.2%, purity 99%, net peptide about 90% of label…

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…

Short version of the title, which is already short: FGP BPC — PeptideMeter came back 99.6% against a claimed 99.0%. Longer version underneath. Since the title puts…

Slightly embarrassed to be asking this, but: how much of what we believe about batch actually comes from purity threads. Spent four months confusing area% and mass% in…

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…

COA — what am I missing here. I am not trying to be the "source?" guy. I would just like a source. UV at 214nm sees the peptide bond and picks up almost everything; at…

Numbers in the title, numbers in the post. 14th independent test on GGPeps — 98.3% on a claimed 97.5%, and the trend is the interesting part. To save the first four…

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%.…

reading area percent threads from 2024 and half of it aged badly. I have gone back and forth on this for months. UV at 214nm sees the peptide bond and picks up almost…

Question in the title, detail here: help me understand batch, I have read the wiki twice. The PDF creation date being later than the analysis date is usually a re-issue…

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…

Thinking out loud about this: purity — 9 things I got wrong before I got it right. How to ask for a batch record without it turning into a negotiation. One email, three…

the area percent advice in here is 2 years out of date, which sounds obvious until you try to state the evidence for it. Since the title puts numbers in the shop…