AX-2024-004337 · Epitalon · QSC lot QSC-2403-Y7501

Section 1

Results

Measured against the index acceptance specification for the short bioregulator 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, 30 min gradient, 214 nm	99.58	% area	≥ 99.0	PASS
Total impurities	RP-HPLC, sum of reported peaks	0.42	% area	≤ 1.0	PASS
Largest single impurity	RP-HPLC — Ala-Glu-Asp tripeptide (−57 Da)	0.15	% area	≤ 1.00	PASS
Identity — theoretical monoisotopic mass	calculated from molecular formula	390.1387	Da	—	NOT TESTED
Identity — observed monoisotopic mass	LC-MS, high resolution (ESI-TOF/QTOF)	390.1367	Da	—	NOT TESTED
Mass accuracy	observed vs theoretical	-5.2	ppm	± 20	PASS
Peptide content	not ordered on this submission	not determined	—	required to check label claim	NOT TESTED
Water content	Karl Fischer, coulometric, duplicate	6.52	%	≤ 12.0	PASS
Counter-ion (acetate)	anion-exchange ion chromatography	8.49	%	≤ 10.0	PASS
Residual solvent + inorganic residue	estimated — see /methods/residual-solvents-q3c/	0.60	%	—	NOT TESTED
Endotoxin	kinetic chromogenic LAL	0.80	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	White cake, partial shrinkage from vial wall	—	white to off-white intact cake	FAIL
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	6.18	—	2.5 – 8.0	PASS
Retention time (observed)	RP-HPLC, 30 min gradient	4.51	min	4.62 ± 0.20 (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	59,552	—	≥ 20,000	PASS
Resolution to nearest impurity	vs β-Asp isomer	1.32	—	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, 30 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 59,552, 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 0.15 % impurity against a 99.58 % 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	Epitalon — main peak	4.51	4,839,897	99.58	—
2	Ala-Glu-Asp tripeptide (−57 Da)	4.31	7,290	0.15	-57.021
3	aspartimide (−18 Da)	4.63	5,346	0.11	-18.011
4	diketopiperazine (−18 Da)	4.67	4,860	0.10	-18.011
5	β-Asp isomer	4.41	2,916	0.06	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 3

Mass spectrum and identity

Theoretical monoisotopic mass 390.1387 Da, computed from C14H22N4O9. 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 390.1367 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 (%)
1+	391.1460	391.1440	-0.0020	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)	99.25	99.58	divergence -0.67 pp vs batch median
Total impurities (% area)	1.09	0.42
Largest single impurity (% area)	not stated	0.15
Water (%)	5.2	6.52
Counter-ion (%)	9.0	8.49
Peptide content (%w/w)	85.2	not determined
Endotoxin (EU/mg)	not stated	0.80
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: Buyer-sourced
Evidentiary weight: Strongest available evidence in this index.
Chain of custody: Retail purchase → submitter (2–8 °C, 14 d) → laboratory (courier, ambient, 9 d) → assay.
Assay date: 13 Jul 2024
Submitted to the index: 15 Jul 2024
Laboratory: Janoshik Analytical, Ostrava, Czechia
Method basis: 30 min gradient · high-resolution MS
Verification status: METHOD LIMITED

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 3

Signed technical comments from index contributors. Not a discussion forum — annotations question or contextualise the result, and the data team replies where a reply is warranted.

peak_integrator15 Jul 2024

99.58 % on Epitalon sits at the top of what this index sees. Read it with the method: Janoshik ran a 30 min gradient here, and the compound fingerprint names a mass-identical species that a shorter run folds into the main peak. On this gradient the figure is well founded.

diode_array15 Jul 2024

Photodiode-array spectral homogeneity across the main peak would convert 99.58 % from a good number into a checked one. It is a free measurement on any instrument that already has the detector.

tbu_residual15 Jul 2024

Residual side-chain protection at +56 Da is the classic silent passenger on a high-purity trace. Nothing at that offset above threshold on this record.

Section 7

Related records

Same batch — lot QSC-2403-Y7501 n=12

Report	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2024-004330	QSC-2403-Y7501	Janoshik	2024-Q3	99.92	6.14	88.9	Buyer-sourced	2	MARGINAL
AX-2024-004331	QSC-2403-Y7501	Medutest	2024-Q3	99.93	6.10	105.3	Buyer-sourced	1	MARGINAL
AX-2024-004332	QSC-2403-Y7501	Janoshik	2024-Q3	99.64	6.70	97.0	Buyer-sourced	1	FAIL
AX-2024-004333	QSC-2403-Y7501	Kestrel	2024-Q3	99.93	5.87	106.9	Buyer-sourced	1	MARGINAL
AX-2024-004334	QSC-2403-Y7501	Janoshik	2024-Q3	99.83	6.80	94.0	Buyer-sourced	1	FAIL
AX-2024-004335	QSC-2403-Y7501	Janoshik	2024-Q3	99.93	5.99	—	Buyer-sourced	1	MARGINAL
AX-2024-004336	QSC-2403-Y7501	Medutest	2024-Q3	99.93	5.91	—	Buyer-sourced	1	MARGINAL
AX-2024-004338	QSC-2403-Y7501	Janoshik	2024-Q3	99.91	6.90	—	Buyer-sourced	1	FAIL
AX-2024-004339	QSC-2403-Y7501	Medutest	2024-Q3	99.93	6.33	100.2	Buyer-sourced	1	MARGINAL
AX-2024-004340	QSC-2403-Y7501	Janoshik	2024-Q3	99.79	6.39	89.7	Buyer-sourced	2	MARGINAL
AX-2024-004341	QSC-2403-Y7501	Nordanalyt	2024-Q3	99.54	6.54	97.4	Buyer-sourced	1	MARGINAL

Batch rollup and reproducibility assessment →

Cross-sections

Other recent Epitalon records in the index.
Report	Supplier	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Result
AX-2026-042008	AMB	AMB-2602-Y6433	Janoshik	2026-Q3	99.30	8.75	105.1	Buyer-sourced	PASS
AX-2026-042009	AMB	AMB-2602-Y6433	VendorInvestigate	2026-Q3	99.16	8.62	102.3	Buyer-sourced	FAIL
AX-2026-042010	AMB	AMB-2602-Y6433	Janoshik	2026-Q3	99.09	8.20	103.4	Laboratory-retained	FAIL
AX-2026-042007	AMB	AMB-2602-Y6433	Janoshik	2026-Q3	99.42	8.62	93.8	Buyer-sourced	FAIL
AX-2026-042468	Homopeptide	HOMO-2512-A5108	Janoshik	2026-Q2	99.93	7.81	100.8	Buyer-sourced	PASS
AX-2026-042463	Homopeptide	HOMO-2512-A5108	Janoshik	2026-Q2	99.93	7.68	93.2	Buyer-sourced	FAIL
AX-2026-042041	HYB	HYB-2603-U7133	Janoshik	2026-Q2	99.65	6.82	95.3	Buyer-sourced	FAIL
AX-2026-042470	Homopeptide	HOMO-2512-A5108	Janoshik	2026-Q2	99.63	7.99	—	Buyer-sourced	FAIL

Other recent QSC records in the index.
Report	Compound	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-041599	CJC-1295 (no DAC)	QSC-2606-V7416	VendorInvestigate	2026-Q3	97.96	3.52	—	Buyer-sourced	1	FAIL
AX-2026-041601	CJC-1295 (no DAC)	QSC-2606-V7416	Kestrel	2026-Q3	98.33	4.10	—	Buyer-sourced	1	MARGINAL
AX-2026-041602	CJC-1295 (no DAC)	QSC-2606-V7416	VendorInvestigate	2026-Q3	98.36	3.38	101.8	Buyer-sourced	1	MARGINAL
AX-2026-041477	Triptorelin	QSC-2607-C5749	Nordanalyt	2026-Q3	99.53	3.42	—	Buyer-sourced	0	PASS
AX-2026-041600	CJC-1295 (no DAC)	QSC-2606-V7416	Nordanalyt	2026-Q3	97.74	4.91	100.9	Buyer-sourced	1	FAIL
AX-2026-041603	CJC-1295 (no DAC)	QSC-2606-V7416	PeptideMeter	2026-Q3	98.43	4.20	—	Buyer-sourced	1	MARGINAL
AX-2026-041606	CJC-1295 (no DAC)	QSC-2606-V7416	Janoshik	2026-Q3	98.03	3.58	—	Buyer-sourced	1	MARGINAL
AX-2026-041585	Liraglutide	QSC-2605-W7381	Medutest	2026-Q3	99.59	5.09	92.8	Laboratory-retained	0	PASS