AX-2024-004923

Gonadorelin · 2 mg declared · Shanghai ERP Biotechnology Co., Ltd. · lot ERP-2406-C7750

MARGINALIDENTITY CONSISTENT

Report ID: AX-2024-004923
Compound: Gonadorelin
Compound class: Hypothalamic and posterior-pituitary hormones
Supplier: ERP — Shanghai ERP Biotechnology Co., Ltd.
Batch / lot: ERP-2406-C7750
Declared label claim: 2mg
Laboratory: Kestrel Bioanalytical
Assay date: 20 Jul 2024
Submitted: 12 Aug 2024
Quarter: 2024-Q3
Submitter: p.yildiz
Sample provenance: Supplier-supplied

Section 1

Results

Measured against the index acceptance specification for the hypothalamic and posterior-pituitary hormones 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, 15 min gradient, 214 nm	99.52	% area	≥ 98.5	PASS
Total impurities	RP-HPLC, sum of reported peaks	0.48	% area	≤ 1.5	PASS
Largest single impurity	RP-HPLC — oxidised Trp (+16 Da)	0.27	% area	≤ 1.00	PASS
Identity — theoretical monoisotopic mass	calculated from molecular formula	1181.5825	Da	—	NOT TESTED
Identity — observed monoisotopic mass	LC-MS, unit resolution (single quadrupole)	1181.5829	Da	—	NOT TESTED
Mass accuracy	observed vs theoretical	+0.3	ppm	± 15	PASS
Total peptide content	by difference from the gravimetric mass balance	90.28	%w/w	—	NOT TESTED
Target-compound content	total peptide content × purity	89.85	%w/w	—	NOT TESTED
Gross fill (as weighed)	five-place balance, under nitrogen	2.16	mg	2 mg declared	NOT TESTED
Recovered target peptide	gross fill × target content	1.941	mg	2 mg claim	NOT TESTED
Recovery against label claim	recovered ÷ claim	97.1	%	90.0 – 110.0	PASS
Water content	Karl Fischer, coulometric, duplicate	3.70	%	≤ 8.0	PASS
Counter-ion (acetate)	anion-exchange ion chromatography	5.40	%	≤ 10.0	PASS
Residual solvent + inorganic residue	estimated — see /methods/residual-solvents-q3c/	0.62	%	—	NOT TESTED
Endotoxin	not ordered on this submission	not determined	—	≤ 5.0	NOT TESTED
Sterility	not ordered on this submission	not determined	—	no growth	NOT TESTED
Appearance	visual, diffuse light, black and white background	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	5.47	—	2.5 – 8.0	PASS
Retention time (observed)	RP-HPLC, 15 min gradient	4.79	min	4.69 ± 0.25 (normalised)	PASS
Peak asymmetry (10 % height)	Ph. Eur. 2.2.46	1.25	—	0.80 – 1.50	PASS
Plate count, main peak	N = 5.54 (t/w½)²	86,935	—	≥ 20,000	PASS
Resolution to nearest impurity	vs C-terminal free acid (+1 Da)	1.20	—	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, 15 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 86,935, and skew follows the reported asymmetry factor of 1.25. 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 0.27 % impurity against a 99.52 % 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	Gonadorelin — main peak	4.79	4,836,981	99.52	—
2	oxidised Trp (+16 Da)	4.63	13,123	0.27	+15.995
3	des-Gly10-NH2 (−74 Da)	4.65	6,318	0.13	-74.048
4	ring-opened pGlu (+18 Da)	4.56	2,430	0.05	+18.011
5	C-terminal free acid (+1 Da)	4.87	1,458	0.03	+0.984
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 1181.5825 Da, computed from C55H75N17O13. All ppm figures on this site are against monoisotopic values — see why that matters.

Figure 2. ESI charge-state envelope, unit-resolution instrument. Sticks are placed at m/z = (M + z × 1.007276)/z for the observed neutral mass of 1181.5829 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+	394.8681	394.8682	0.0001	8.4
2+	591.7985	591.7987	0.0002	51.3
1+	1182.5898	1182.5902	0.0004	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.

Component	Determination	%w/w of cake
Water	Karl Fischer	3.70
Counter-ion (acetate)	ion chromatography	5.40
Residual solvent + inorganic residue	estimated	0.62
Total peptide content	by difference	90.28
Total		100.00 CLOSES

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)	100.0	99.52	divergence +0.43 pp vs batch median
Total impurities (% area)	0.00	0.48
Largest single impurity (% area)	0.00	0.27
Water (%)	not stated	3.70
Counter-ion (%)	3.6	5.40
Peptide content (%w/w)	92.3	90.28
Endotoxin (EU/mg)	not stated	not determined
Method stated on certificate	YES	—	column, gradient and wavelength given

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 Jul 2024
Submitted to the index: 12 Aug 2024
Laboratory: Kestrel Bioanalytical, Melbourne, Australia
Method basis: 15 min gradient · unit-resolution MS
Verification status: IDENTITY CONSISTENT

What this report does not establish

That the compound is not a near-isobaric alternative. Identity was confirmed at unit mass resolution, which cannot exclude species differing by 1 or 2 Da. The specific alternatives not excluded are named in the identity block above.
That the material is free of bacterial endotoxin. Endotoxin was not measured. No chromatographic result bears on it.
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 ERP-2406-C7750 n=4

Report	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2024-004922	ERP-2406-C7750	Nordanalyt	2024-Q3	99.62	3.40	95.5	Supplier-supplied	1	MARGINAL
AX-2024-004924	ERP-2406-C7750	Janoshik	2024-Q3	99.93	3.43	88.9	Supplier-supplied	2	MARGINAL
AX-2024-004925	ERP-2406-C7750	Janoshik	2024-Q3	99.28	4.02	—	Buyer-sourced	3	MARGINAL

Batch rollup and reproducibility assessment →

Cross-sections

Other recent Gonadorelin records in the index.
Report	Supplier	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-042914	MKM	MKM-2604-A2596	Janoshik	2026-Q2	99.93	5.19	—	Supplier-supplied	0	PASS
AX-2026-042911	MKM	MKM-2604-A2596	Medutest	2026-Q2	99.08	5.55	—	Buyer-sourced	1	MARGINAL
AX-2026-042916	MKM	MKM-2604-A2596	VendorInvestigate	2026-Q2	99.36	4.91	102.1	Buyer-sourced	1	MARGINAL
AX-2026-042038	TFC	TFC-2511-E6450	Janoshik	2026-Q2	99.03	2.63	101.8	Supplier-supplied	0	PASS
AX-2026-042039	TFC	TFC-2511-E6450	Janoshik	2026-Q2	99.39	2.81	96.2	Supplier-supplied	0	PASS
AX-2026-042917	MKM	MKM-2604-A2596	Kestrel	2026-Q2	99.76	5.43	105.7	Buyer-sourced	1	MARGINAL
AX-2026-042944	MKM	MKM-2512-N3913	PeptideMeter	2026-Q2	99.92	5.75	91.1	Supplier-supplied	0	PASS
AX-2026-042033	TFC	TFC-2511-E6450	PeptideMeter	2026-Q2	99.48	2.96	—	Supplier-supplied	1	MARGINAL

Other recent ERP records in the index.
Report	Compound	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-042574	TB-500	ERP-2605-S8022	VendorInvestigate	2026-Q3	99.54	2.91	96.4	Buyer-sourced	1	MARGINAL
AX-2026-042535	Tesamorelin	ERP-2604-W7280	Janoshik	2026-Q3	99.19	3.89	92.7	Supplier-supplied	1	MARGINAL
AX-2026-042577	TB-500	ERP-2605-S8022	Janoshik	2026-Q3	99.51	3.45	—	Supplier-supplied	1	MARGINAL
AX-2026-042542	Tesamorelin	ERP-2604-W7280	Janoshik	2026-Q3	98.54	4.58	103.1	Supplier-supplied	2	FAIL
AX-2026-042547	Survodutide	ERP-2605-E7682	PeptideMeter	2026-Q3	98.25	5.44	93.0	Supplier-supplied	1	MARGINAL
AX-2026-042540	Tesamorelin	ERP-2604-W7280	Kestrel	2026-Q3	99.72	3.47	103.2	Supplier-supplied	1	MARGINAL
AX-2026-042575	TB-500	ERP-2605-S8022	Janoshik	2026-Q3	99.93	3.36	95.5	Supplier-supplied	0	PASS
AX-2026-042539	Tesamorelin	ERP-2604-W7280	Janoshik	2026-Q3	98.77	4.30	89.9	Buyer-sourced	2	MARGINAL