AX-2026-043436 · MOTS-c · BCH lot BCH-2511-L3743

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	97.34	% area	≥ 98.0	FAIL
Total impurities	RP-HPLC, sum of reported peaks	2.66	% area	≤ 2.0	FAIL
Largest single impurity	RP-HPLC — Met1 sulfoxide (+16 Da)	1.61	% area	≤ 1.00	FAIL
Identity — theoretical monoisotopic mass	calculated from molecular formula	2173.0918	Da	—	NOT TESTED
Identity — observed monoisotopic mass	LC-MS, high resolution (ESI-TOF/QTOF)	2173.0792	Da	—	NOT TESTED
Mass accuracy	observed vs theoretical	-5.8	ppm	± 15	PASS
Total peptide content	by difference from the gravimetric mass balance	91.88	%w/w	—	NOT TESTED
Target-compound content	total peptide content × purity	89.44	%w/w	—	NOT TESTED
Gross fill (as weighed)	five-place balance, under nitrogen	11.41	mg	10 mg declared	NOT TESTED
Recovered target peptide	gross fill × target content	10.205	mg	10 mg claim	NOT TESTED
Recovery against label claim	recovered ÷ claim	102.1	%	90.0 – 110.0	PASS
Water content	Karl Fischer, coulometric, duplicate	3.86	%	≤ 9.0	PASS
Counter-ion (acetate)	anion-exchange ion chromatography	3.94	%	≤ 12.0	PASS
Residual solvent + inorganic residue	estimated — see /methods/residual-solvents-q3c/	0.32	%	—	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	Clear, colourless, no visible particulates	—	clear, no visible particulates	PASS
pH (reconstituted, 1 mg/mL)	potentiometric, two-point calibration	5.60	—	2.5 – 8.0	PASS
Retention time (observed)	RP-HPLC, 30 min gradient	10.58	min	10.42 ± 0.30 (normalised)	PASS
Peak asymmetry (10 % height)	Ph. Eur. 2.2.46	1.30	—	0.80 – 1.50	PASS
Plate count, main peak	N = 5.54 (t/w½)²	49,995	—	≥ 20,000	PASS
Resolution to nearest impurity	vs des-Met1 (−131 Da)	1.13	—	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 49,995, and skew follows the reported asymmetry factor of 1.30. 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 1.61 % impurity against a 97.34 % 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	10.58	4,731,026	97.34	—
2	Met1 sulfoxide (+16 Da)	10.20	78,251	1.61	+15.995
3	bis-sulfoxide (+32 Da)	9.92	28,676	0.59	+31.990
4	des-Met1 (−131 Da)	10.80	12,151	0.25	-131.040
5	deamidated (+1 Da)	10.28	10,207	0.21	+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 3

Mass spectrum and identity

Theoretical monoisotopic mass 2173.0918 Da, computed from C101H152N28O22S2. 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 2173.0792 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 (%)
4+	544.2802	544.2771	-0.0031	8.8
3+	725.3712	725.3670	-0.0042	50.9
2+	1087.5532	1087.5469	-0.0063	100.0
1+	2174.0991	2174.0865	-0.0126	52.7

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	3.86
Counter-ion (acetate)	ion chromatography	3.94
Residual solvent + inorganic residue	estimated	0.32
Total peptide content	by difference	91.88
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)	97.0	97.34	divergence -0.34 pp vs batch median
Total impurities (% area)	not stated	2.66
Largest single impurity (% area)	not stated	1.61
Water (%)	2.3	3.86
Counter-ion (%)	not stated	3.94
Peptide content (%w/w)	not stated	91.88
Endotoxin (EU/mg)	not stated	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 → submitter (ambient, 25 d) → laboratory (courier, cold pack, 10 d) → assay.
Assay date: 08 Apr 2026
Submitted to the index: 29 Apr 2026
Laboratory: Janoshik Analytical, Ostrava, Czechia
Method basis: 30 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 4

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.

macrolactam29 Apr 2026

Where the sequence is cyclised, the uncyclised precursor elutes early and is easy to mistake for a truncation. The mass distinguishes the two and this record carries one, so the check costs nothing.

ms_confirm29 Apr 2026

-5.8 ppm at this mass is a clean identity confirmation. With retention at 10.58 min, MOTS-c is established as the species measured. Note what it does not exclude: a mass-identical diastereomer, which no mass measurement of any resolution can.

one_directional29 Apr 2026

Direction is the thing to watch, not roundness. Rounded declarations in this index sit above and below the independent median at close to equal rates, which is what scatter looks like.

aaa_hydrolysis29 Apr 2026

Total peptide content and target-compound content are different numbers: the second is the first multiplied by purity. Certificates conflate them routinely and this record separates them.

Section 7

Related records

Same batch — lot BCH-2511-L3743 n=3

Report	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-043437	BCH-2511-L3743	Janoshik	2026-Q2	97.09	3.67	95.1	Buyer-sourced	1	FAIL
AX-2026-043438	BCH-2511-L3743	PeptideMeter	2026-Q2	97.39	3.65	—	Supplier-supplied	1	FAIL

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 BCH records in the index.
Report	Compound	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-043445	BPC-157	BCH-2603-G4350	Nordanalyt	2026-Q3	98.42	4.87	93.6	Buyer-sourced	1	MARGINAL
AX-2026-043440	BPC-157	BCH-2603-G4350	VendorInvestigate	2026-Q3	98.61	4.11	—	Buyer-sourced	1	MARGINAL
AX-2026-043442	BPC-157	BCH-2603-G4350	Janoshik	2026-Q3	98.65	4.78	—	Buyer-sourced	1	MARGINAL
AX-2026-043471	CJC-1295 with DAC	BCH-2607-H5235	Janoshik	2026-Q3	97.46	5.48	—	Buyer-sourced	1	FAIL
AX-2026-043477	CJC-1295 with DAC	BCH-2607-H5235	VendorInvestigate	2026-Q3	97.62	5.32	99.6	Buyer-sourced	1	MARGINAL
AX-2026-043449	BPC-157	BCH-2603-G4350	Kestrel	2026-Q3	99.74	4.92	91.3	Supplier-supplied	2	MARGINAL
AX-2026-043448	BPC-157	BCH-2603-G4350	Janoshik	2026-Q3	98.55	4.69	106.9	Buyer-sourced	1	MARGINAL
AX-2026-043470	CJC-1295 with DAC	BCH-2607-H5235	Janoshik	2026-Q3	97.76	6.11	99.3	Supplier-supplied	1	MARGINAL