AX-2025-018817

Kisspeptin-10 · 10 mg declared · Qingdao Sigma Chemical Co., Ltd. · lot QSC-2412-W8004

MARGINALPURITY ONLY

Report ID: AX-2025-018817
Compound: Kisspeptin-10
Compound class: Melanocortin-receptor peptides
Supplier: QSC — Qingdao Sigma Chemical Co., Ltd.
Batch / lot: QSC-2412-W8004
Declared label claim: 10mg
Laboratory: Nordanalyt Laboratories
Assay date: 08 Jan 2025
Submitted: 12 Jan 2025
Quarter: 2025-Q1
Submitter: so.beaulieu
Sample provenance: Supplier-supplied

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	99.93	% area	≥ 98.5	PASS
Total impurities	RP-HPLC, sum of reported peaks	0.07	% area	≤ 1.5	PASS
Largest single impurity	RP-HPLC — des-Tyr (−163 Da)	0.04	% area	≤ 1.00	PASS
Identity	not ordered on this submission	not determined	—	required for VERIFIED status	NOT TESTED
Total peptide content	by difference from the gravimetric mass balance	89.17	%w/w	—	NOT TESTED
Target-compound content	total peptide content × purity	89.11	%w/w	—	NOT TESTED
Gross fill (as weighed)	five-place balance, under nitrogen	11.09	mg	10 mg declared	NOT TESTED
Recovered target peptide	gross fill × target content	9.882	mg	10 mg claim	NOT TESTED
Recovery against label claim	recovered ÷ claim	98.8	%	90.0 – 110.0	PASS
Water content	Karl Fischer, coulometric, duplicate	5.89	%	≤ 8.0	PASS
Counter-ion (acetate)	anion-exchange ion chromatography	4.26	%	≤ 10.0	PASS
Residual solvent + inorganic residue	estimated — see /methods/residual-solvents-q3c/	0.68	%	—	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 with a single visible fibre	—	clear, no visible particulates	FAIL
pH (reconstituted, 1 mg/mL)	potentiometric, two-point calibration	5.92	—	2.5 – 8.0	PASS
Retention time (observed)	RP-HPLC, 35 min gradient	10.56	min	10.54 ± 0.25 (normalised)	PASS
Peak asymmetry (10 % height)	Ph. Eur. 2.2.46	1.22	—	0.80 – 1.50	PASS
Plate count, main peak	N = 5.54 (t/w½)²	80,001	—	≥ 20,000	PASS
Resolution to nearest impurity	vs [D-Trp]-epimer	0.91	—	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 80,001, and skew follows the reported asymmetry factor of 1.22. 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 0.04 % impurity against a 99.93 % 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	Kisspeptin-10 — main peak	10.56	4,856,908	99.93	—
2	des-Tyr (−163 Da)	9.91	1,944	0.04	-163.063
3	[D-Trp]-epimer	10.42	1,458	0.03	0.000
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 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	5.89
Counter-ion (acetate)	ion chromatography	4.26
Residual solvent + inorganic residue	estimated	0.68
Total peptide content	by difference	89.17
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)	99.90	99.93	divergence +0.33 pp vs batch median
Total impurities (% area)	not stated	0.07
Largest single impurity (% area)	not stated	0.04
Water (%)	not stated	5.89
Counter-ion (%)	not stated	4.26
Peptide content (%w/w)	91.7	89.17
Endotoxin (EU/mg)	0.32	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: 08 Jan 2025
Submitted to the index: 12 Jan 2025
Laboratory: Nordanalyt Laboratories, Uppsala, Sweden
Method basis: 35 min gradient · high-resolution MS
Verification status: PURITY ONLY

What this report does not establish

That the compound is the compound named. No identity confirmation was ordered on this submission. A purity figure describes chromatographic homogeneity of whatever eluted; it does not name it.
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 QSC-2412-W8004 n=9

Report	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2025-018810	QSC-2412-W8004	Janoshik	2025-Q1	99.76	5.21	90.7	Supplier-supplied	1	MARGINAL
AX-2025-018811	QSC-2412-W8004	VendorInvestigate	2025-Q1	99.09	5.35	101.5	Buyer-sourced	1	MARGINAL
AX-2025-018812	QSC-2412-W8004	PeptideMeter	2025-Q1	99.85	5.96	—	Supplier-supplied	0	PASS
AX-2025-018813	QSC-2412-W8004	PeptideMeter	2025-Q1	99.29	5.21	—	Supplier-supplied	1	MARGINAL
AX-2025-018814	QSC-2412-W8004	Janoshik	2025-Q1	99.57	5.47	97.9	Supplier-supplied	1	MARGINAL
AX-2025-018815	QSC-2412-W8004	PeptideMeter	2025-Q1	99.81	5.70	—	Supplier-supplied	1	MARGINAL
AX-2025-018816	QSC-2412-W8004	Nordanalyt	2025-Q1	99.53	5.48	92.7	Supplier-supplied	1	MARGINAL
AX-2025-018818	QSC-2412-W8004	Nordanalyt	2025-Q1	99.57	6.16	98.8	Supplier-supplied	1	MARGINAL

Batch rollup and reproducibility assessment →

Cross-sections

Other recent Kisspeptin-10 records in the index.
Report	Supplier	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-042461	SWB	SWB-2603-D6238	Janoshik	2026-Q3	98.35	4.65	96.5	Supplier-supplied	3	FAIL
AX-2026-043176	GL Biochem	GLBI-2608-N8085	Medutest	2026-Q3	98.22	3.30	92.5	Buyer-sourced	2	FAIL
AX-2026-043180	GL Biochem	GLBI-2608-N8085	Janoshik	2026-Q3	98.69	3.37	103.8	Supplier-supplied	2	MARGINAL
AX-2026-042460	SWB	SWB-2603-D6238	Kestrel	2026-Q3	99.55	4.21	90.8	Supplier-supplied	3	MARGINAL
AX-2026-042458	SWB	SWB-2603-D6238	Kestrel	2026-Q3	98.51	4.71	102.4	Supplier-supplied	3	MARGINAL
AX-2026-043178	GL Biochem	GLBI-2608-N8085	Janoshik	2026-Q3	98.24	4.44	96.0	Supplier-supplied	2	FAIL
AX-2026-042463	SWB	SWB-2603-D6238	Nordanalyt	2026-Q3	98.35	4.93	98.6	Supplier-supplied	3	FAIL
AX-2026-042465	SWB	SWB-2603-D6238	Kestrel	2026-Q3	99.03	4.83	96.4	Supplier-supplied	3	MARGINAL

Other recent QSC records in the index.
Report	Compound	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-041683	CJC-1295 (no DAC)	QSC-2606-V8637	Janoshik	2026-Q3	99.93	3.63	97.1	Supplier-supplied	1	FAIL
AX-2026-041727	CJC-1295 with DAC	QSC-2602-E9474	Janoshik	2026-Q3	98.88	6.62	105.3	Supplier-supplied	1	MARGINAL
AX-2026-041728	CJC-1295 with DAC	QSC-2602-E9474	VendorInvestigate	2026-Q3	98.42	7.04	—	Buyer-sourced	1	MARGINAL
AX-2026-041734	CJC-1295 with DAC	QSC-2602-E9474	Medutest	2026-Q3	99.43	7.17	105.5	Supplier-supplied	2	FAIL
AX-2026-041652	Liraglutide	QSC-2605-W8602	Nordanalyt	2026-Q3	99.33	6.55	—	Supplier-supplied	0	PASS
AX-2026-041730	CJC-1295 with DAC	QSC-2602-E9474	PeptideMeter	2026-Q3	98.79	6.93	95.4	Supplier-supplied	1	MARGINAL
AX-2026-041686	CJC-1295 (no DAC)	QSC-2606-V8637	Janoshik	2026-Q3	99.93	4.04	—	Supplier-supplied	0	PASS
AX-2026-041653	Liraglutide	QSC-2605-W8602	VendorInvestigate	2026-Q3	98.82	5.95	—	Buyer-sourced	0	PASS