AX-2026-042957

Semax · 20 mg declared · Xi'an Mokemei Biotechnology Co., Ltd. · lot MKM-2512-B3991

MARGINALIDENTITY CONSISTENT

Report ID: AX-2026-042957
Compound: Semax
Compound class: Neuroactive and cognitive peptides
Supplier: MKM — Xi'an Mokemei Biotechnology Co., Ltd.
Batch / lot: MKM-2512-B3991
Declared label claim: 20mg
Laboratory: Nordanalyt Laboratories
Assay date: 05 May 2026
Submitted: 17 May 2026
Quarter: 2026-Q2
Submitter: au.marchand
Sample provenance: Buyer-sourced

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, 35 min gradient, 214 nm	98.75	% area	≥ 98.5	PASS
Total impurities	RP-HPLC, sum of reported peaks	1.25	% area	≤ 1.5	PASS
Largest single impurity	RP-HPLC — Met1 sulfoxide (+16 Da)	0.88	% 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)	813.3501	Da	—	NOT TESTED
Mass accuracy	observed vs theoretical	-4.9	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	6.63	%	≤ 12.0	PASS
Counter-ion (acetate)	anion-exchange ion chromatography	5.62	%	≤ 10.0	PASS
Residual solvent + inorganic residue	estimated — see /methods/residual-solvents-q3c/	0.81	%	—	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	5.76	—	2.5 – 8.0	PASS
Retention time (observed)	RP-HPLC, 35 min gradient	8.14	min	8.14 ± 0.25 (normalised)	PASS
Peak asymmetry (10 % height)	Ph. Eur. 2.2.46	1.15	—	0.80 – 1.50	PASS
Plate count, main peak	N = 5.54 (t/w½)²	53,321	—	≥ 20,000	PASS
Resolution to nearest impurity	vs diketopiperazine (−18 Da)	1.29	—	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 53,321, and skew follows the reported asymmetry factor of 1.15. 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 0.88 % impurity against a 98.75 % 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	8.14	4,799,556	98.75	—
2	Met1 sulfoxide (+16 Da)	7.72	42,771	0.88	+15.995
3	diketopiperazine (−18 Da)	8.33	11,179	0.23	-18.011
4	N-acetyl semax (+42 Da)	8.63	3,888	0.08	+42.011
5	des-Met (−131 Da)	8.37	2,916	0.06	-131.040
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 813.3501 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	407.6823	-0.0020	57.7
1+	814.3614	814.3574	-0.0040	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)	99.0	98.75	divergence +0.25 pp vs batch median
Total impurities (% area)	not stated	1.25
Largest single impurity (% area)	not stated	0.88
Water (%)	5.6	6.63
Counter-ion (%)	not stated	5.62
Peptide content (%w/w)	89.6	not determined
Endotoxin (EU/mg)	0.24	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: Retail purchase → third-party forwarder (3 d) → laboratory (courier, cold pack, 3 d) → assay.
Assay date: 05 May 2026
Submitted to the index: 17 May 2026
Laboratory: Nordanalyt Laboratories, Uppsala, Sweden
Method basis: 35 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 2

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.

ms_confirm17 May 2026

Identity confirmed and purity at 98.75 %. The two answer different questions — what it is, and how much else is in it — and a record carrying both is the version worth citing.

spec_vs_result17 May 2026

A specification is a decision and a result is a measurement. Where a template puts one in the other's field the fix is editorial, and the numbers behind it reconcile fine — 98.75 % here against the declared figure.

Section 7

Related records

Same batch — lot MKM-2512-B3991 n=11

Report	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-042950	MKM-2512-B3991	Kestrel	2026-Q2	99.05	6.39	91.9	Buyer-sourced	1	MARGINAL
AX-2026-042951	MKM-2512-B3991	PeptideMeter	2026-Q2	99.10	6.94	100.0	Supplier-supplied	1	MARGINAL
AX-2026-042952	MKM-2512-B3991	Medutest	2026-Q2	98.93	7.12	—	Buyer-sourced	2	FAIL
AX-2026-042953	MKM-2512-B3991	PeptideMeter	2026-Q2	98.72	6.69	95.0	Buyer-sourced	1	MARGINAL
AX-2026-042954	MKM-2512-B3991	VendorInvestigate	2026-Q2	98.47	6.74	—	Buyer-sourced	1	FAIL
AX-2026-042955	MKM-2512-B3991	Janoshik	2026-Q2	98.91	6.47	102.5	Supplier-supplied	1	MARGINAL
AX-2026-042956	MKM-2512-B3991	Janoshik	2026-Q2	98.59	6.47	106.5	Buyer-sourced	1	MARGINAL
AX-2026-042958	MKM-2512-B3991	Janoshik	2026-Q2	98.72	7.11	—	Buyer-sourced	1	MARGINAL
AX-2026-042959	MKM-2512-B3991	Janoshik	2026-Q2	98.57	6.80	104.6	Buyer-sourced	1	MARGINAL
AX-2026-042960	MKM-2512-B3991	Kestrel	2026-Q2	99.93	6.65	—	Buyer-sourced	1	MARGINAL

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 MKM records in the index.
Report	Compound	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Result
AX-2026-042942	CJC-1295 (no DAC)	MKM-2603-V3346	Janoshik	2026-Q3	99.52	3.43	—	Supplier-supplied	PASS
AX-2026-043019	Adipotide	MKM-2606-K5012	Janoshik	2026-Q3	97.61	5.77	105.1	Buyer-sourced	PASS
AX-2026-042939	CJC-1295 (no DAC)	MKM-2603-V3346	PeptideMeter	2026-Q3	99.44	3.39	—	Buyer-sourced	PASS
AX-2026-043020	Adipotide	MKM-2606-K5012	Medutest	2026-Q3	97.73	5.74	—	Buyer-sourced	PASS
AX-2026-043022	Adipotide	MKM-2606-K5012	Kestrel	2026-Q3	97.69	6.33	106.9	Buyer-sourced	PASS
AX-2026-043023	Adipotide	MKM-2606-K5012	Medutest	2026-Q3	97.48	5.56	103.7	Supplier-supplied	PASS
AX-2026-042945	CJC-1295 (no DAC)	MKM-2603-V3346	PeptideMeter	2026-Q3	99.39	3.54	—	Laboratory-retained	PASS
AX-2026-042938	CJC-1295 (no DAC)	MKM-2603-V3346	Nordanalyt	2026-Q3	99.47	3.67	95.0	Buyer-sourced	PASS