AssayIndex

GLBI-2511-F8417

PT-141 (Bremelanotide) · 10 mg declared · GL Biochem (Shanghai) Ltd. · manufactured 21 Nov 2025

CHARACTERISEDSHARED BULK
Lot code
GLBI-2511-F8417
Supplier
GL Biochem — GL Biochem (Shanghai) Ltd.
Compound
PT-141 (Bremelanotide)
Compound class
Melanocortin-receptor peptides
Declared label claim
10mg
Manufacture date
21 Nov 2025
Index quarter
2026-Q2
Independent assays
7
Laboratories involved
PeptideMeter, Medutest, Janoshik, VendorInvestigate
Provenance mix
Buyer-sourced ×1 · Supplier-supplied ×6
Section 1

Reproducibility across independent tests

Every report below is an observation of the same physical material. What they disagree about is measurement; what they agree about is the lot. The size of the disagreement is compared against what the contributing laboratories' own repeatability figures predict.

Independent assays 7
Median purity 97.84% n=7
Spread (max − min) 1.18pp n=7
Standard deviation 0.451pp n=7
97.497.898.398.899.299.7100.1This lot (GLBI-2511-F8417)This lot (GLBI-2511-F8417): Q1 97.66, median 97.84, Q3 98.22, n=7n=7All PT-141 (Bremelanotide)All PT-141 (Bremelanotide): Q1 98.69, median 99.31, Q3 99.84, n=200n=200 Purity (% area)
Figure 1. This lot's independent purity results against the whole PT-141 (Bremelanotide) record set in the index. The vertical line is the index acceptance specification for the melanocortin-receptor peptides class, 98.5 % area. A narrow box on the top row against a wide box on the bottom row is the ideal reading: it means the disagreement between lots is much larger than the disagreement within this one.
Section 2

Member reports 7

Every report the index holds on this lot. Each is a page carrying its own chromatogram, mass spectrum, mass balance, provenance and caveats.

ReportLotLabQuarterPurity %Water %Recovery %ProvenanceFlagsResult
AX-2026-043181GLBI-2511-F8417PeptideMeter2026-Q297.662.41Supplier-supplied2FAIL
AX-2026-043182GLBI-2511-F8417Medutest2026-Q297.572.3693.0Supplier-supplied2FAIL
AX-2026-043183GLBI-2511-F8417Janoshik2026-Q297.841.92Supplier-supplied2FAIL
AX-2026-043184GLBI-2511-F8417VendorInvestigate2026-Q297.673.0199.8Buyer-sourced2FAIL
AX-2026-043185GLBI-2511-F8417Medutest2026-Q298.472.58Supplier-supplied2FAIL
AX-2026-043186GLBI-2511-F8417PeptideMeter2026-Q298.752.31107.2Supplier-supplied2MARGINAL
AX-2026-043187GLBI-2511-F8417Janoshik2026-Q297.972.82Supplier-supplied2FAIL
Section 3

By laboratory

Where more than one laboratory assayed this lot, the difference between them is a paired observation of their relative bias — the same material, the same time window, different instruments. Those pairs are what the index's bias estimates are built from.

LaboratoryReportsPurity results (% area)MedianGradientPublished bias (pp)Bias-adjusted
PeptideMeter297.66, 98.7598.2028min-0.0598.25
Medutest297.57, 98.4798.0225min+0.0897.94
Janoshik297.84, 97.9797.9130min+0.0097.91
VendorInvestigate197.6797.6732min-0.1197.78

This lot contributes 6 paired comparisons to the inter-lab analysis.

Section 4

The supplier's certificate for this lot

One number the supplier wrote, beside the median of the numbers other people measured on the same physical material. That comparison is only available because the index groups by lot.

FigureSupplier COAThis reportIndex note
Purity (% area)98.4197.66divergence +0.57 pp vs batch median
Total impurities (% area)0.782.34
Largest single impurity (% area)0.301.58
Water (%)1.62.41
Counter-ion (%)5.96.25
Peptide content (%w/w)91.9not determined
Endotoxin (EU/mg)1.05not determined
Method stated on certificateYEScolumn, gradient and wavelength given
Section 5

Impurity fingerprint

The named impurities reported across this lot's assays, with how consistently each was seen. A fingerprint is what allows two lot numbers held by different companies to be identified as one bulk.

Named impurityReported inMedian % areaRange
melanotan II (C-terminal amide, −1 Da)7 / 71.030.25–1.58
des-acetyl (−42 Da)7 / 70.340.06–0.53
oxidised Trp (+16 Da)7 / 70.120.08–1.56
linear precursor (+18 Da)7 / 70.110.08–0.26
Section 6

Shared-bulk links

Rule AX-R09. Where impurity fingerprints and latent composition match across companies, the index treats the material as one bulk and counts it once in aggregates.

LotSold byRoleReportsMedian purity
CPC-2502-X3345CPClinked child298.82
GLBI-2511-F8417GL Biochemthis lot797.84
Section 7

What this rollup does not establish