AX-2025-020438 · Semax · KP lot KP-2502-H5248

Section 1

Results

Measured against the index acceptance specification for the neuroactive and cognitive 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, 32 min gradient, 214 nm	98.29	% area	≥ 98.5	FAIL
Total impurities	RP-HPLC, sum of reported peaks	1.71	% area	≤ 1.5	FAIL
Largest single impurity	RP-HPLC — Met1 sulfoxide (+16 Da)	0.95	% area	≤ 1.00	PASS
Identity — theoretical monoisotopic mass	calculated from molecular formula	813.3541	Da	—	NOT TESTED
Identity — observed monoisotopic mass	LC-MS, high resolution (ESI-TOF/QTOF)	813.3560	Da	—	NOT TESTED
Mass accuracy	observed vs theoretical	+2.3	ppm	± 15	PASS
Total peptide content	by difference from the gravimetric mass balance	86.85	%w/w	—	NOT TESTED
Target-compound content	total peptide content × purity	85.36	%w/w	—	NOT TESTED
Gross fill (as weighed)	five-place balance, under nitrogen	10.41	mg	10 mg declared	NOT TESTED
Recovered target peptide	gross fill × target content	8.886	mg	10 mg claim	NOT TESTED
Recovery against label claim	recovered ÷ claim	88.9	%	90.0 – 110.0	FAIL
Water content	Karl Fischer, coulometric, duplicate	5.84	%	≤ 12.0	PASS
Counter-ion (acetate)	anion-exchange ion chromatography	6.84	%	≤ 10.0	PASS
Residual solvent + inorganic residue	estimated — see /methods/residual-solvents-q3c/	0.47	%	—	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 to pale-yellow cake, intact	—	white to off-white intact cake	PASS
Reconstitution clarity	reconstituted per submitter procedure	Clear after 90 s gentle swirling, no particulates	—	clear, no visible particulates	PASS
pH (reconstituted, 1 mg/mL)	potentiometric, two-point calibration	5.03	—	2.5 – 8.0	PASS
Retention time (observed)	RP-HPLC, 32 min gradient	7.52	min	7.49 ± 0.25 (normalised)	PASS
Peak asymmetry (10 % height)	Ph. Eur. 2.2.46	1.10	—	0.80 – 1.50	PASS
Plate count, main peak	N = 5.54 (t/w½)²	56,738	—	≥ 20,000	PASS
Resolution to nearest impurity	vs diketopiperazine (−18 Da)	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, 32 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 56,738, and skew follows the reported asymmetry factor of 1.10. 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 0.95 % impurity against a 98.29 % 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	Semax — main peak	7.52	4,777,199	98.29	—
2	Met1 sulfoxide (+16 Da)	7.14	46,173	0.95	+15.995
3	N-acetyl semax (+42 Da)	7.97	23,329	0.48	+42.011
4	des-Met (−131 Da)	7.73	9,235	0.19	-131.040
5	diketopiperazine (−18 Da)	7.69	4,374	0.09	-18.011
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 813.3541 Da, computed from C37H51N9O10S. 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 813.3560 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 (%)
2+	407.6843	407.6853	0.0010	49.4
1+	814.3614	814.3633	0.0019	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	5.84
Counter-ion (acetate)	ion chromatography	6.84
Residual solvent + inorganic residue	estimated	0.47
Total peptide content	by difference	86.85
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)	98.77	98.29	divergence -0.06 pp vs batch median
Total impurities (% area)	1.23	1.71
Largest single impurity (% area)	not stated	0.95
Water (%)	not stated	5.84
Counter-ion (%)	not stated	6.84
Peptide content (%w/w)	91.7	86.85
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: Buyer-sourced
Evidentiary weight: Strongest available evidence in this index.
Chain of custody: Retail purchase → submitter (ambient, 22 d) → laboratory (hand-carried, 4 d) → assay.
Assay date: 26 Jun 2025
Submitted to the index: 08 Jul 2025
Laboratory: VendorInvestigate, Riga, Latvia
Method basis: 32 min gradient · high-resolution MS
Verification status: VERIFIED

What this report does not establish

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 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.

deamidation_rate08 Jul 2025

Deamidation is time, temperature and sequence. If the deamidated species is prominent here, the manufacture date on lot KP-2502-H5248 against the assay date above is the first arithmetic to do.

coa_template08 Jul 2025

The document that arrived with this order is on file and its fields are scored on the supplier's documentation rubric. That score describes what a buyer receives, which is the useful version.

valley_drop08 Jul 2025

Valley height relative to the smaller peak is the practical criterion an operator uses, and it is not on the report. Resolution is a proxy for it and an imperfect one on asymmetric pairs.

Section 7

Related records

Same batch — lot KP-2502-H5248 n=10

Report	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Result
AX-2025-020434	KP-2502-H5248	Janoshik	2025-Q2	98.76	6.87	—	Laboratory-retained	PASS
AX-2025-020435	KP-2502-H5248	PeptideMeter	2025-Q2	98.80	5.96	91.3	Buyer-sourced	PASS
AX-2025-020436	KP-2502-H5248	PeptideMeter	2025-Q2	99.32	6.50	—	Supplier-supplied	PASS
AX-2025-020437	KP-2502-H5248	Medutest	2025-Q2	99.13	6.98	—	Buyer-sourced	PASS
AX-2025-020439	KP-2502-H5248	VendorInvestigate	2025-Q2	98.38	6.81	103.2	Buyer-sourced	FAIL
AX-2025-020440	KP-2502-H5248	Janoshik	2025-Q2	99.10	7.09	—	Buyer-sourced	PASS
AX-2025-020441	KP-2502-H5248	PeptideMeter	2025-Q2	98.86	5.90	—	Laboratory-retained	PASS
AX-2025-020442	KP-2502-H5248	Janoshik	2025-Q2	98.64	6.54	—	Buyer-sourced	PASS
AX-2025-020443	KP-2502-H5248	Janoshik	2025-Q2	99.04	6.59	—	Buyer-sourced	PASS

Batch rollup and reproducibility assessment →

Cross-sections

Other recent Semax records in the index.
Report	Supplier	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Result
AX-2026-042519	Homopeptide	HOMO-2605-S5227	Medutest	2026-Q3	99.75	5.55	—	Buyer-sourced	PASS
AX-2026-042517	Homopeptide	HOMO-2605-S5227	Janoshik	2026-Q3	99.92	5.88	—	Buyer-sourced	PASS
AX-2026-042518	Homopeptide	HOMO-2605-S5227	Janoshik	2026-Q3	99.76	5.61	—	Buyer-sourced	PASS
AX-2026-042524	Homopeptide	HOMO-2605-S5227	Janoshik	2026-Q3	99.93	5.75	100.9	Supplier-supplied	PASS
AX-2026-042516	Homopeptide	HOMO-2605-S5227	Janoshik	2026-Q3	99.93	5.87	95.1	Buyer-sourced	PASS
AX-2026-042522	Homopeptide	HOMO-2605-S5227	Nordanalyt	2026-Q3	99.93	5.49	—	Buyer-sourced	PASS
AX-2026-042520	Homopeptide	HOMO-2605-S5227	Medutest	2026-Q3	99.93	6.12	—	Buyer-sourced	PASS
AX-2026-042514	Homopeptide	HOMO-2605-S5227	Janoshik	2026-Q3	99.59	5.48	97.0	Buyer-sourced	PASS

Other recent KP records in the index.
Report	Compound	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-043095	Retatrutide	KP-2607-H5774	Janoshik	2026-Q3	95.81	5.48	105.2	Buyer-sourced	0	FAIL
AX-2026-043094	Retatrutide	KP-2607-H5774	PeptideMeter	2026-Q3	96.32	6.40	—	Buyer-sourced	0	FAIL
AX-2026-043096	Retatrutide	KP-2607-H5774	VendorInvestigate	2026-Q3	96.48	6.05	104.9	Buyer-sourced	0	FAIL
AX-2026-043090	Retatrutide	KP-2607-H5774	Janoshik	2026-Q3	96.46	5.81	—	Buyer-sourced	0	FAIL
AX-2026-043091	Retatrutide	KP-2607-H5774	Janoshik	2026-Q3	96.13	5.94	—	Buyer-sourced	0	FAIL
AX-2026-043077	TB-500	KP-2605-C5214	Janoshik	2026-Q2	99.61	5.64	90.2	Buyer-sourced	0	PASS
AX-2026-043093	Retatrutide	KP-2607-H5774	Janoshik	2026-Q3	96.54	5.54	—	Buyer-sourced	0	PASS
AX-2026-043092	Retatrutide	KP-2607-H5774	Medutest	2026-Q3	96.64	6.12	—	Buyer-sourced	1	FAIL