AX-2026-043399 · MOTS-c · WXT lot WXT-2512-K3109

Section 1

Results

Measured against the index acceptance specification for the metabolic and mitochondrial 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	97.98	% area	≥ 98.0	FAIL
Total impurities	RP-HPLC, sum of reported peaks	2.02	% area	≤ 2.0	FAIL
Largest single impurity	RP-HPLC — Met1 sulfoxide (+16 Da)	0.89	% 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	92.63	%w/w	—	NOT TESTED
Target-compound content	total peptide content × purity	90.76	%w/w	—	NOT TESTED
Gross fill (as weighed)	five-place balance, under nitrogen	5.05	mg	5 mg declared	NOT TESTED
Recovered target peptide	gross fill × target content	4.583	mg	5 mg claim	NOT TESTED
Recovery against label claim	recovered ÷ claim	91.7	%	90.0 – 110.0	PASS
Water content	Karl Fischer, coulometric, duplicate	1.89	%	≤ 9.0	PASS
Counter-ion (acetate)	anion-exchange ion chromatography	5.25	%	≤ 12.0	PASS
Residual solvent + inorganic residue	estimated — see /methods/residual-solvents-q3c/	0.23	%	—	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	5.02	—	2.5 – 8.0	PASS
Retention time (observed)	RP-HPLC, 30 min gradient	10.48	min	10.42 ± 0.30 (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	74,898	—	≥ 20,000	PASS
Resolution to nearest impurity	vs des-Met1 (−131 Da)	1.40	—	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 74,898, 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 0.89 % impurity against a 97.98 % 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	MOTS-c — main peak	10.48	4,762,132	97.98	—
2	Met1 sulfoxide (+16 Da)	10.10	43,257	0.89	+15.995
3	bis-sulfoxide (+32 Da)	9.82	31,592	0.65	+31.990
4	des-Met1 (−131 Da)	10.70	15,553	0.32	-131.040
5	deamidated (+1 Da)	10.18	7,776	0.16	+0.984
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	1.89
Counter-ion (acetate)	ion chromatography	5.25
Residual solvent + inorganic residue	estimated	0.23
Total peptide content	by difference	92.63
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)	97.69	97.98	divergence -0.03 pp vs batch median
Total impurities (% area)	2.31	2.02
Largest single impurity (% area)	not stated	0.89
Water (%)	1.0	1.89
Counter-ion (%)	not stated	5.25
Peptide content (%w/w)	not stated	92.63
Endotoxin (EU/mg)	0.79	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: Domestic warehouse despatch → submitter (2–8 °C, 31 d) → laboratory (courier, cold pack, 3 d) → assay.
Assay date: 21 Feb 2026
Submitted to the index: 28 Feb 2026
Laboratory: Janoshik Analytical, Ostrava, Czechia
Method basis: 30 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 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.

lambda_28028 Feb 2026

97.98 % on MOTS-c is below the index specification for the class. The interesting part is the distribution: Met1 sulfoxide (+16 Da) at 0.89 % is doing most of the work, and that species is a synthesis artefact rather than a degradation product. This is a process observation about lot WXT-2512-K3109, not a storage one.

wide_iqr28 Feb 2026

The actionable statistic for a buyer is not the median but the tenth percentile — how bad a bad lot is. This record is a data point for that percentile and it is worth more to the index than another result at the top.

prep_hplc_cut28 Feb 2026

The record is published in full, including the impurity table that explains it. A number below specification with a named impurity profile beside it is more useful than a number above specification with nothing beside it.

Section 7

Related records

Same batch — lot WXT-2512-K3109 n=5

Report	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-043398	WXT-2512-K3109	Medutest	2026-Q1	97.72	2.33	102.3	Buyer-sourced	0	FAIL
AX-2026-043400	WXT-2512-K3109	PeptideMeter	2026-Q1	97.53	2.10	102.8	Buyer-sourced	0	FAIL
AX-2026-043401	WXT-2512-K3109	VendorInvestigate	2026-Q1	97.71	2.07	—	Buyer-sourced	0	FAIL
AX-2026-043402	WXT-2512-K3109	Medutest	2026-Q1	98.68	2.13	88.6	Supplier-supplied	2	MARGINAL

Batch rollup and reproducibility assessment →

Cross-sections

Other recent MOTS-c records in the index.
Report	Supplier	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-042083	HYB	HYB-2606-D7858	Medutest	2026-Q3	99.93	2.02	—	Buyer-sourced	0	PASS
AX-2026-042090	HYB	HYB-2606-D7858	Janoshik	2026-Q3	99.57	2.36	—	Buyer-sourced	1	FAIL
AX-2026-042084	HYB	HYB-2606-D7858	Janoshik	2026-Q3	99.28	2.79	107.3	Buyer-sourced	0	PASS
AX-2026-042087	HYB	HYB-2606-D7858	Janoshik	2026-Q3	99.54	3.05	—	Buyer-sourced	0	PASS
AX-2026-042085	HYB	HYB-2606-D7858	Janoshik	2026-Q3	99.51	2.31	—	Buyer-sourced	0	PASS
AX-2026-042088	HYB	HYB-2606-D7858	PeptideMeter	2026-Q3	99.22	2.21	—	Buyer-sourced	0	PASS
AX-2026-042086	HYB	HYB-2606-D7858	Janoshik	2026-Q3	99.93	3.02	—	Buyer-sourced	1	MARGINAL
AX-2026-042081	HYB	HYB-2606-D7858	Nordanalyt	2026-Q3	99.68	3.31	96.5	Laboratory-retained	0	PASS

Other recent WXT records in the index.
Report	Compound	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-043376	Semaglutide	WXT-2604-C3248	Janoshik	2026-Q3	97.08	4.22	—	Buyer-sourced	1	MARGINAL
AX-2026-043429	L-Glutathione (reduced)	WXT-2605-B3833	Nordanalyt	2026-Q3	98.48	6.58	96.9	Supplier-supplied	1	FAIL
AX-2026-043347	Leuprolide	WXT-2604-K2596	PeptideMeter	2026-Q3	99.16	5.99	93.6	Buyer-sourced	0	PASS
AX-2026-043353	Leuprolide	WXT-2604-K2596	Janoshik	2026-Q3	99.19	4.90	95.3	Laboratory-retained	0	PASS
AX-2026-043345	Leuprolide	WXT-2604-K2596	Janoshik	2026-Q3	98.93	5.28	—	Buyer-sourced	0	PASS
AX-2026-043424	L-Glutathione (reduced)	WXT-2605-B3833	PeptideMeter	2026-Q3	98.37	6.86	—	Buyer-sourced	0	FAIL
AX-2026-043374	Semaglutide	WXT-2604-C3248	Janoshik	2026-Q3	97.00	3.56	—	Buyer-sourced	1	MARGINAL
AX-2026-043377	Semaglutide	WXT-2604-C3248	PeptideMeter	2026-Q3	97.20	4.08	—	Buyer-sourced	1	MARGINAL