AX-2025-020483

Sermorelin · 2 mg declared · Zhuhai Kerui Biotechnology Co., Ltd. · lot KP-2501-V5157

PASSIDENTITY CONSISTENT

Report ID: AX-2025-020483
Compound: Sermorelin
Compound class: Growth-hormone axis peptides
Supplier: KP — Zhuhai Kerui Biotechnology Co., Ltd.
Batch / lot: KP-2501-V5157
Declared label claim: 2mg
Laboratory: PeptideMeter
Assay date: 25 Jan 2025
Submitted: 19 Feb 2025
Quarter: 2025-Q1
Submitter: Contributor #L-4409
Sample provenance: Buyer-sourced

Section 1

Results

Measured against the index acceptance specification for the growth-hormone axis 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, 28 min gradient, 214 nm	98.14	% area	≥ 98.0	PASS
Total impurities	RP-HPLC, sum of reported peaks	1.86	% area	≤ 2.0	PASS
Largest single impurity	RP-HPLC — aspartimide (−18 Da)	0.79	% area	≤ 1.00	PASS
Identity — theoretical monoisotopic mass	calculated from molecular formula	3355.7245	Da	—	NOT TESTED
Identity — observed monoisotopic mass	LC-MS, high resolution (ESI-TOF/QTOF)	3355.7208	Da	—	NOT TESTED
Mass accuracy	observed vs theoretical	-1.1	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	6.28	%	≤ 9.0	PASS
Counter-ion (acetate)	anion-exchange ion chromatography	4.64	%	≤ 12.0	PASS
Residual solvent + inorganic residue	estimated — see /methods/residual-solvents-q3c/	0.18	%	—	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	Off-white lyophilised cake, intact	—	white to off-white intact cake	PASS
Reconstitution clarity	reconstituted per submitter procedure	Visible particulates, did not clear	—	clear, no visible particulates	FAIL
pH (reconstituted, 1 mg/mL)	potentiometric, two-point calibration	4.94	—	2.5 – 8.0	PASS
Retention time (observed)	RP-HPLC, 28 min gradient	11.62	min	11.66 ± 0.30 (normalised)	PASS
Peak asymmetry (10 % height)	Ph. Eur. 2.2.46	1.12	—	0.80 – 1.50	PASS
Plate count, main peak	N = 5.54 (t/w½)²	55,116	—	≥ 20,000	PASS
Resolution to nearest impurity	vs deamidated Asn8 (+1 Da)	1.38	—	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, 28 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 55,116, and skew follows the reported asymmetry factor of 1.12. 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 0.79 % impurity against a 98.14 % 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	Sermorelin — main peak	11.62	4,769,908	98.14	—
2	aspartimide (−18 Da)	11.96	38,396	0.79	-18.011
3	deamidated Asn8 (+1 Da)	11.34	33,536	0.69	+0.984
4	des-Tyr1 (−163 Da)	11.13	10,207	0.21	-163.063
5	truncated (1-25)	10.65	8,263	0.17	-455.248
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 3355.7245 Da, computed from C149H246N44O42. 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 3355.7208 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 (%)
5+	672.1522	672.1514	-0.0008	8.6
4+	839.9384	839.9375	-0.0009	50.9
3+	1119.5821	1119.5809	-0.0012	100.0
2+	1678.8695	1678.8677	-0.0018	54.2

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)	98.89	98.14	divergence +0.04 pp vs batch median
Total impurities (% area)	1.11	1.86
Largest single impurity (% area)	0.65	0.79
Water (%)	not stated	6.28
Counter-ion (%)	4.2	4.64
Peptide content (%w/w)	91.7	not determined
Endotoxin (EU/mg)	0.15	not determined
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: Buyer-sourced
Evidentiary weight: Strongest available evidence in this index.
Chain of custody: Domestic warehouse despatch → submitter (2–8 °C, 13 d) → laboratory (courier, cold pack, 10 d) → assay.
Assay date: 25 Jan 2025
Submitted to the index: 19 Feb 2025
Laboratory: PeptideMeter, Tallinn, Estonia
Method basis: 28 min gradient · high-resolution MS
Verification status: IDENTITY CONSISTENT

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 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 KP-2501-V5157 n=12

Report	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2025-020479	KP-2501-V5157	Janoshik	2025-Q1	99.01	5.53	90.5	Supplier-supplied	0	PASS
AX-2025-020480	KP-2501-V5157	Janoshik	2025-Q1	98.83	5.44	91.1	Supplier-supplied	0	PASS
AX-2025-020481	KP-2501-V5157	Kestrel	2025-Q1	98.83	5.99	—	Buyer-sourced	1	MARGINAL
AX-2025-020482	KP-2501-V5157	Medutest	2025-Q1	98.01	5.61	96.8	Buyer-sourced	0	PASS
AX-2025-020484	KP-2501-V5157	Kestrel	2025-Q1	98.90	5.67	104.2	Supplier-supplied	0	PASS
AX-2025-020485	KP-2501-V5157	PeptideMeter	2025-Q1	98.91	5.13	—	Supplier-supplied	0	PASS
AX-2025-020486	KP-2501-V5157	Nordanalyt	2025-Q1	98.88	5.93	—	Supplier-supplied	0	PASS
AX-2025-020487	KP-2501-V5157	PeptideMeter	2025-Q1	99.09	5.48	96.0	Supplier-supplied	0	PASS
AX-2025-020488	KP-2501-V5157	Janoshik	2025-Q1	98.99	5.51	—	Supplier-supplied	0	PASS
AX-2025-020489	KP-2501-V5157	VendorInvestigate	2025-Q1	98.17	5.28	101.3	Buyer-sourced	0	PASS
AX-2025-020490	KP-2501-V5157	Medutest	2025-Q1	98.62	4.90	107.0	Laboratory-retained	1	FAIL

Batch rollup and reproducibility assessment →

Cross-sections

Other recent Sermorelin records in the index.
Report	Supplier	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-042057	TFC	TFC-2605-Y6440	Janoshik	2026-Q3	98.68	3.94	98.3	Supplier-supplied	0	PASS
AX-2026-043421	WXT	WXT-2608-P4867	Janoshik	2026-Q3	98.15	3.09	—	Supplier-supplied	0	PASS
AX-2026-043420	WXT	WXT-2608-P4867	Medutest	2026-Q3	98.62	3.07	96.4	Supplier-supplied	0	PASS
AX-2026-043423	WXT	WXT-2608-P4867	Janoshik	2026-Q3	98.28	3.86	98.5	Buyer-sourced	0	PASS
AX-2026-042058	TFC	TFC-2605-Y6440	Nordanalyt	2026-Q3	98.71	3.69	107.1	Supplier-supplied	0	PASS
AX-2026-043422	WXT	WXT-2608-P4867	Medutest	2026-Q3	98.35	3.59	—	Supplier-supplied	1	MARGINAL
AX-2026-043418	WXT	WXT-2608-P4867	Janoshik	2026-Q3	98.47	2.88	89.7	Supplier-supplied	1	MARGINAL
AX-2026-042060	TFC	TFC-2605-Y6440	Nordanalyt	2026-Q3	98.31	3.30	92.4	Supplier-supplied	0	PASS

Other recent KP records in the index.
Report	Compound	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-043029	Retatrutide	KP-2607-H5219	Medutest	2026-Q3	95.45	5.71	—	Supplier-supplied	2	FAIL
AX-2026-043030	Retatrutide	KP-2607-H5219	Kestrel	2026-Q3	95.97	6.95	97.1	Supplier-supplied	2	FAIL
AX-2026-043106	Tirzepatide	KP-2608-D5921	PeptideMeter	2026-Q3	98.90	5.45	105.4	Supplier-supplied	2	MARGINAL
AX-2026-043108	Tirzepatide	KP-2608-D5921	Janoshik	2026-Q3	99.70	5.45	—	Supplier-supplied	2	MARGINAL
AX-2026-043039	Retatrutide	KP-2607-H5219	Janoshik	2026-Q3	96.14	5.62	—	Supplier-supplied	2	FAIL
AX-2026-043100	Tirzepatide	KP-2608-D5921	VendorInvestigate	2026-Q3	98.27	5.31	94.4	Buyer-sourced	2	MARGINAL
AX-2026-043090	Ipamorelin	KP-2606-D5887	Janoshik	2026-Q3	98.18	3.07	101.2	Laboratory-retained	1	FAIL
AX-2026-043028	Retatrutide	KP-2607-H5219	Janoshik	2026-Q3	96.52	6.09	—	Supplier-supplied	2	MARGINAL