AX-2024-005048 · PT-141 (Bremelanotide) · MKM lot MKM-2406-H2712

Section 1

Results

Measured against the index acceptance specification for the melanocortin-receptor peptides class. A specification is a decision the index made; a result is a measurement. See where each threshold came from.

Parameter	Method	Result	Unit	Index spec
Purity	RP-HPLC, 35 min gradient, 214 nm	97.82	% area	≥ 98.5	FAIL
Total impurities	RP-HPLC, sum of reported peaks	2.18	% area	≤ 1.5	FAIL
Largest single impurity	RP-HPLC — linear precursor (+18 Da)	0.86	% area	≤ 1.00	PASS
Identity — theoretical monoisotopic mass	calculated from molecular formula	1024.5242	Da	—	NOT TESTED
Identity — observed monoisotopic mass	LC-MS, high resolution (ESI-TOF/QTOF)	1024.5226	Da	—	NOT TESTED
Mass accuracy	observed vs theoretical	-1.6	ppm	± 15	PASS
Peptide content	not ordered on this submission	not determined	—	required to check label claim	NOT TESTED
Water content	Karl Fischer, coulometric, duplicate	5.84	%	≤ 8.0	PASS
Counter-ion (acetate)	anion-exchange ion chromatography	4.07	%	≤ 10.0	PASS
Residual solvent + inorganic residue	estimated — see /methods/residual-solvents-q3c/	0.96	%	—	NOT TESTED
Endotoxin	kinetic chromogenic LAL	0.25	EU/mg	≤ 5.0	PASS
Sterility	not ordered on this submission	not determined	—	no growth	NOT TESTED
Appearance	visual, diffuse light, black and white background	Off-white lyophilised cake, intact	—	white to off-white intact cake	PASS
Reconstitution clarity	reconstituted per submitter procedure	Clear, colourless, no visible particulates	—	clear, no visible particulates	PASS
pH (reconstituted, 1 mg/mL)	potentiometric, two-point calibration	5.80	—	2.5 – 8.0	PASS
Retention time (observed)	RP-HPLC, 35 min gradient	10.93	min	10.98 ± 0.25 (normalised)	PASS
Peak asymmetry (10 % height)	Ph. Eur. 2.2.46	1.18	—	0.80 – 1.50	PASS
Plate count, main peak	N = 5.54 (t/w½)²	48,166	—	≥ 20,000	PASS
Resolution to nearest impurity	vs melanotan II (C-terminal amide, −1 Da)	1.83	—	no index criterion	REPORTED

Section 2

Chromatogram and peak integration

The figure is drawn from the table. It is not an independent illustration — if a number in the table changed, the trace would change with it.

Figure 1. RP-HPLC trace, 35 min gradient, 214 nm. Drawn from the peak-integration table below: peak positions are the reported retention times, peak areas are the reported area percentages, peak widths follow the reported plate count of 48,166, and skew follows the reported asymmetry factor of 1.18. Baseline noise is seeded from the report ID and is illustrative. The lower panel is the same trace at a stated vertical expansion with the slow gradient drift subtracted, because at full scale a 0.86 % impurity against a 97.82 % main peak is a line two pixels tall; the main peak runs off-scale there by design.

#	Peak	RT	Area (µV·s)	% area	Δ mass (Da)
1	PT-141 (Bremelanotide) — main peak	10.93	4,754,355	97.82	—
2	linear precursor (+18 Da)	10.11	41,799	0.86	+18.011
3	oxidised Trp (+16 Da)	10.53	31,592	0.65	+15.995
4	melanotan II (C-terminal amide, −1 Da)	11.30	19,927	0.41	-0.984
5	des-acetyl (−42 Da)	10.39	12,637	0.26	-42.011
Closure check — purity + Σ impurities				100.00	CLOSES

Reporting threshold 0.05 % area. Peaks below it are not reported and are therefore excluded from the total, which overstates purity by their sum — see peak integration.

Section 3

Mass spectrum and identity

Theoretical monoisotopic mass 1024.5242 Da, computed from C50H68N14O10. All ppm figures on this site are against monoisotopic values — see why that matters.

Figure 2. ESI charge-state envelope, high-resolution instrument. Sticks are placed at m/z = (M + z × 1.007276)/z for the observed neutral mass of 1024.5226 Da. Sodium (+21.982/z) and potassium (+37.956/z) adducts are shown where the parent charge state exceeds 25 % relative abundance; they are adducts of the same molecule and are not impurities.

Charge	Theoretical m/z	Observed m/z	Δ m/z	Rel. abundance (%)
3+	342.5153	342.5148	-0.0005	8.2
2+	513.2694	513.2686	-0.0008	51.0
1+	1025.5315	1025.5299	-0.0016	100.0

Section 4

Gravimetric mass balance

Water, counter-ion, residual and total peptide content are exhaustive and mutually exclusive categories. They must account for 100 % of the cake mass. The index closes this to within 0.02 pp and the build asserts it.

Supplier certificate, as declared

The supplier's own figures for this lot, beside the independent measurement. Divergence is assessed against the batch median, not against this single report — see rule AX-R05.

Figure	Supplier COA	This report	Index note
Purity (% area)	99.22	97.82	divergence +0.89 pp vs batch median
Total impurities (% area)	0.78	2.18
Largest single impurity (% area)	not stated	0.86
Water (%)	not stated	5.84
Counter-ion (%)	9.4	4.07
Peptide content (%w/w)	86.5	not determined
Endotoxin (EU/mg)	not stated	0.25
Method stated on certificate	NO	—	no method section — the result cannot be reconciled against any other

Section 5

Provenance and caveats

Where a sample came from changes the weight of the evidence. The index treats it as a first-class field.

Sample provenance: Supplier-supplied
Evidentiary weight: Weaker evidence. Read with the caveat below.
Chain of custody: Supplier despatch → laboratory direct (courier, cold pack, 10 d) → assay. Submitter did not handle the vial.
Assay date: 20 Aug 2024
Submitted to the index: 03 Sep 2024
Laboratory: Nordanalyt Laboratories, Uppsala, Sweden
Method basis: 35 min gradient · high-resolution MS
Verification status: VERIFIED

What this report does not establish

How much of the named compound is in the vial. Peptide content was not determined, so recovered mass cannot be calculated and the label claim cannot be checked.
That the material is sterile. Sterility was not tested.
That any other vial in the same lot has the same composition. One vial was tested. Within-lot vial-to-vial variation in this index has a median of 0.28 pp and a 90th percentile of 0.74 pp.
That any other lot from the same supplier has the same composition. Batch-to-batch variation is larger than within-batch variation for every supplier here.
That the material is suitable for administration to a human or an animal. These are research compounds. No result on this site is a safety assessment and the index takes no position on use.
That the material was manufactured by the supplier that sold it. Contract synthesis is normal in this market and twenty-nine batches in the index fingerprint to a bulk from a different company than the one named on the label.

Section 6

Annotations

No annotations on this record. Annotations are short signed technical comments from index contributors; see how to contribute.

Section 7

Related records

Same batch — lot MKM-2406-H2712 n=10

Report	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Result
AX-2024-005043	MKM-2406-H2712	Janoshik	2024-Q3	98.65	6.14	104.7	Supplier-supplied	PASS
AX-2024-005044	MKM-2406-H2712	Medutest	2024-Q3	98.70	5.55	—	Supplier-supplied	PASS
AX-2024-005045	MKM-2406-H2712	Janoshik	2024-Q3	98.41	5.31	—	Supplier-supplied	FAIL
AX-2024-005046	MKM-2406-H2712	Janoshik	2024-Q3	98.21	6.49	—	Supplier-supplied	FAIL
AX-2024-005047	MKM-2406-H2712	Janoshik	2024-Q3	98.28	5.56	—	Supplier-supplied	FAIL
AX-2024-005049	MKM-2406-H2712	Janoshik	2024-Q3	98.38	5.99	91.6	Supplier-supplied	FAIL
AX-2024-005050	MKM-2406-H2712	Janoshik	2024-Q3	98.05	5.06	107.4	Supplier-supplied	FAIL
AX-2024-005051	MKM-2406-H2712	Janoshik	2024-Q3	98.97	5.38	94.0	Supplier-supplied	PASS
AX-2024-005052	MKM-2406-H2712	Janoshik	2024-Q3	98.11	5.94	93.9	Laboratory-retained	FAIL

Batch rollup and reproducibility assessment →

Cross-sections

All PT-141 (Bremelanotide) records n=200
All MKM records n=272
All Nordanalyt records n=511
All 2024-Q3 records n=522
PT-141 (Bremelanotide) by supplier
PT-141 (Bremelanotide) impurity profile

Other recent PT-141 (Bremelanotide) records in the index.
Report	Supplier	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Result
AX-2026-041488	QYB	QYB-2607-L5615	Janoshik	2026-Q3	99.93	3.79	—	Supplier-supplied	PASS
AX-2026-041483	QYB	QYB-2607-L5615	Janoshik	2026-Q3	99.93	3.87	—	Supplier-supplied	PASS
AX-2026-041482	QYB	QYB-2607-L5615	PeptideMeter	2026-Q3	99.41	3.97	—	Supplier-supplied	PASS
AX-2026-041489	QYB	QYB-2607-L5615	PeptideMeter	2026-Q3	99.40	4.39	90.1	Supplier-supplied	PASS
AX-2026-041480	QYB	QYB-2607-L5615	Medutest	2026-Q3	99.93	4.32	100.5	Supplier-supplied	PASS
AX-2026-041481	QYB	QYB-2607-L5615	Kestrel	2026-Q3	99.93	3.63	100.5	Supplier-supplied	PASS
AX-2026-041487	QYB	QYB-2607-L5615	Nordanalyt	2026-Q3	99.43	4.03	—	Supplier-supplied	PASS
AX-2026-041486	QYB	QYB-2607-L5615	Nordanalyt	2026-Q3	99.62	3.82	104.9	Supplier-supplied	PASS

Other recent MKM records in the index.
Report	Compound	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-042943	Adipotide	MKM-2606-K4013	Janoshik	2026-Q3	97.92	6.31	—	Supplier-supplied	1	MARGINAL
AX-2026-042891	CJC-1295 (no DAC)	MKM-2603-V2347	Janoshik	2026-Q3	99.28	3.63	—	Supplier-supplied	1	MARGINAL
AX-2026-042942	Adipotide	MKM-2606-K4013	VendorInvestigate	2026-Q3	97.04	5.56	94.6	Buyer-sourced	1	FAIL
AX-2026-042914	Gonadorelin	MKM-2604-A2596	Janoshik	2026-Q2	99.93	5.19	—	Supplier-supplied	0	PASS
AX-2026-042884	BPC-157	MKM-2605-X2575	Nordanalyt	2026-Q2	98.12	2.89	—	Laboratory-retained	1	MARGINAL
AX-2026-042946	Tirzepatide	MKM-2601-L3752	Medutest	2026-Q2	97.71	8.10	—	Supplier-supplied	1	FAIL
AX-2026-042911	Gonadorelin	MKM-2604-A2596	Medutest	2026-Q2	99.08	5.55	—	Buyer-sourced	1	MARGINAL
AX-2026-042932	L-Glutathione (reduced)	MKM-2511-F2902	Janoshik	2026-Q2	98.57	8.41	92.9	Supplier-supplied	1	MARGINAL