Resolution scales with the square root of plate count and linearly with selectivity. Shallowing the gradient changes selectivity, which is the more effective of the two levers on a close pair.
gradient_25
Argues that gradient length belongs on every certificate. Named the handle after the argument.
Section 1
Contribution
Both submits records and annotates other people's.
Records submitted
9
n=9
Annotations
219
n=219
Median purity submitted
99.19%
n=9
Suppliers covered
9
n=9
Section 2
Records submitted
A submitter chose to buy this material and to pay for this assay. That choice is the selection mechanism behind the whole index and it is not random.
| Report | Compound | Supplier | Lot | Lab | Quarter | Purity % | Water % | Recovery % | Provenance | Flags | Result |
|---|---|---|---|---|---|---|---|---|---|---|---|
| AX-2026-043557 | Cagrilintide | SIG | SIG-2603-6212 | Janoshik | 2026-Q2 | 98.28 | 4.41 | 99.0 | Buyer-sourced | 0 | PASS |
| AX-2026-043264 | IGF-1 LR3 | CPC | CPC-2512-S1358 | Kestrel | 2026-Q2 | 98.65 | 2.40 | 104.2 | Supplier-supplied | 1 | MARGINAL |
| AX-2025-019274 | GHRP-6 | AMB | AMB-2506-D5337 | Janoshik | 2025-Q4 | 99.21 | 3.87 | — | Buyer-sourced | 0 | PASS |
| AX-2025-020976 | PT-141 (Bremelanotide) | WXT | WXT-2507-R4042 | Medutest | 2025-Q3 | 99.00 | 4.50 | 101.5 | Buyer-sourced | 0 | PASS |
| AX-2025-019383 | MK-677 (Ibutamoren mesylate) | HYB | HYB-2505-M6859 | Kestrel | 2025-Q2 | 99.82 | 5.19 | 99.8 | Buyer-sourced | 0 | FAIL |
| AX-2025-018409 | Semaglutide | WWB | WWB-2502-W1846 | Kestrel | 2025-Q1 | 99.93 | 5.78 | — | Laboratory-retained | 1 | MARGINAL |
| AX-2025-018766 | BPC-157 | QSC | QSC-2412-D7527 | Janoshik | 2025-Q1 | 99.23 | 6.00 | 99.6 | Buyer-sourced | 0 | PASS |
| AX-2024-004694 | GHK-Cu | Homopeptide | HOMO-2408-C3445 | Janoshik | 2024-Q3 | 99.19 | 5.69 | — | Buyer-sourced | 0 | PASS |
| AX-2024-004854 | Tirzepatide | ERP | ERP-2401-D8257 | PeptideMeter | 2024-Q2 | 98.55 | 4.45 | 97.0 | Buyer-sourced | 0 | PASS |
Section 3
Annotations
Signed technical comments on records. The index does not moderate annotations for agreement with its own arithmetic, and several of these disagree with it. Where a handle has made the same point on several records, one instance is shown and the rest are reachable from the records themselves.
Purity 99.24 % with maleimide dimer at 0.49 % nearby. Read the pair together: the purity figure and its nearest neighbour are two views of one integration decision.
The gradient is on the record, which is the first thing that should be true of any purity figure and often is not. 30 min at Janoshik puts this comparison on a documented footing.
The gradient is on the record, which is the first thing that should be true of any purity figure and often is not. 15 min at Kestrel puts this comparison on a documented footing.
Normalisation assumes the gradient was linear and ran to completion. A method with an isocratic hold at the start breaks the assumption and the certificate will not mention the hold.
Purity at 99.93 % and water at 3.91 %: the two numbers are independent and both are needed. Excellent chromatography on a wet cake still yields less peptide per vial than the label implies.
The gradient is on the record, which is the first thing that should be true of any purity figure and often is not. 28 min at PeptideMeter puts this comparison on a documented footing.
Gradient length belongs on every certificate. On a close-eluting pair it is not a detail, it is the whole determination.
Purity at 99.55 % and water at 2.60 %: the two numbers are independent and both are needed. Excellent chromatography on a wet cake still yields less peptide per vial than the label implies.
The gradient is on the record, which is the first thing that should be true of any purity figure and often is not. 32 min at VendorInvestigate puts this comparison on a documented footing.
Purity 98.40 % with Met(O) sulfoxide (+16 Da) at 0.95 % nearby. Read the pair together: the purity figure and its nearest neighbour are two views of one integration decision.
The gradient is on the record, which is the first thing that should be true of any purity figure and often is not. 25 min at Medutest puts this comparison on a documented footing.
Showing 12 distinct comments of 219 annotations by this handle.