AX-2026-041918 · Mazdutide · SinoPep lot SNP-2602-U4281

Section 1

Results

Measured against the index acceptance specification for the incretin analogues and co-agonists 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	97.49	% area	≥ 96.5	PASS
Total impurities	RP-HPLC, sum of reported peaks	2.51	% area	≤ 3.5	PASS
Largest single impurity	RP-HPLC — oxidised Met (+16 Da)	1.59	% area	≤ 1.00	FAIL
Identity — theoretical monoisotopic mass	calculated from molecular formula	4912.6408	Da	—	NOT TESTED
Identity — observed monoisotopic mass	LC-MS, high resolution (ESI-TOF/QTOF)	4912.6344	Da	—	NOT TESTED
Mass accuracy	observed vs theoretical	-1.3	ppm	± 15	PASS
Total peptide content	by difference from the gravimetric mass balance	87.84	%w/w	—	NOT TESTED
Target-compound content	total peptide content × purity	85.64	%w/w	—	NOT TESTED
Gross fill (as weighed)	five-place balance, under nitrogen	11.94	mg	10 mg declared	NOT TESTED
Recovered target peptide	gross fill × target content	10.225	mg	10 mg claim	NOT TESTED
Recovery against label claim	recovered ÷ claim	102.3	%	90.0 – 110.0	PASS
Water content	Karl Fischer, coulometric, duplicate	3.95	%	≤ 8.0	PASS
Counter-ion (TFA)	anion-exchange ion chromatography	7.79	%	≤ 12.0	PASS
Residual solvent + inorganic residue	estimated — see /methods/residual-solvents-q3c/	0.42	%	—	NOT TESTED
Endotoxin	kinetic chromogenic LAL	0.13	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	2.77	—	2.5 – 8.0	PASS
Retention time (observed)	RP-HPLC, 30 min gradient	19.49	min	19.42 ± 0.50 (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	50,471	—	≥ 20,000	PASS
Resolution to nearest impurity	vs [D-Aib2]-diastereomer	0.59	—	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 50,471, 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 1.59 % impurity against a 97.49 % 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	Mazdutide — main peak	19.49	4,738,316	97.49	—
2	oxidised Met (+16 Da)	18.79	77,279	1.59	+15.995
3	des-Aib2 analogue	19.10	29,648	0.61	-85.053
4	truncated (4-39)	17.75	9,235	0.19	-315.169
5	[D-Aib2]-diastereomer	19.28	2,916	0.06	0.000
6	trifluoroacetyl adduct (+96 Da)	20.39	2,916	0.06	+95.982
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 4912.6408 Da, computed from C226H352N50O70. 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 4912.6344 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 (%)
7+	702.8131	702.8122	-0.0009	8.9
6+	819.7807	819.7797	-0.0010	53.5
5+	983.5354	983.5342	-0.0012	100.0
4+	1229.1675	1229.1659	-0.0016	50.3
3+	1638.5542	1638.5521	-0.0021	8.9

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	3.95
Counter-ion (TFA)	ion chromatography	7.79
Residual solvent + inorganic residue	estimated	0.42
Total peptide content	by difference	87.84
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)	99.90	97.49	divergence +1.99 pp vs batch median
Total impurities (% area)	0.10	2.51
Largest single impurity (% area)	0.05	1.59
Water (%)	3.8	3.95
Counter-ion (%)	3.3	7.79
Peptide content (%w/w)	92.3	87.84
Endotoxin (EU/mg)	not stated	0.13
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, 30 d) → laboratory (courier, cold pack, 12 d) → assay.
Assay date: 05 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 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.

ppm_error29 Apr 2026

Well inside class limit. Worth noting that the class limits are set by mass rather than globally, because the same ppm is a different number of daltons at 340 and at 4,800.

buyer_sourced29 Apr 2026

Independently purchased, at the submitter's own cost, forwarded without the supplier's involvement. That is the definition and this record meets it.

Section 7

Related records

Same batch — lot SNP-2602-U4281 n=8

Report	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-041915	SNP-2602-U4281	PeptideMeter	2026-Q2	97.89	4.10	94.8	Buyer-sourced	1	MARGINAL
AX-2026-041916	SNP-2602-U4281	Janoshik	2026-Q2	97.92	3.65	—	Buyer-sourced	1	MARGINAL
AX-2026-041917	SNP-2602-U4281	Janoshik	2026-Q2	98.02	3.98	90.6	Buyer-sourced	1	MARGINAL
AX-2026-041919	SNP-2602-U4281	Nordanalyt	2026-Q2	98.01	4.37	93.8	Buyer-sourced	1	MARGINAL
AX-2026-041920	SNP-2602-U4281	Janoshik	2026-Q2	97.77	4.41	88.7	Buyer-sourced	2	MARGINAL
AX-2026-041921	SNP-2602-U4281	Janoshik	2026-Q2	98.21	4.18	92.9	Buyer-sourced	1	MARGINAL
AX-2026-041922	SNP-2602-U4281	VendorInvestigate	2026-Q2	97.88	3.68	91.3	Buyer-sourced	1	MARGINAL

Batch rollup and reproducibility assessment →

Cross-sections

Other recent Mazdutide records in the index.
Report	Supplier	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-042930	MKM	MKM-2511-N3837	Janoshik	2026-Q2	98.08	7.96	—	Buyer-sourced	1	MARGINAL
AX-2026-042923	MKM	MKM-2511-N3837	Janoshik	2026-Q2	98.46	6.72	97.9	Buyer-sourced	0	PASS
AX-2026-042928	MKM	MKM-2511-N3837	Janoshik	2026-Q2	98.59	6.41	—	Buyer-sourced	0	PASS
AX-2026-042926	MKM	MKM-2511-N3837	Nordanalyt	2026-Q2	98.67	6.63	93.6	Buyer-sourced	0	PASS
AX-2026-041921	SinoPep	SNP-2602-U4281	Janoshik	2026-Q2	98.21	4.18	92.9	Buyer-sourced	1	MARGINAL
AX-2026-041920	SinoPep	SNP-2602-U4281	Janoshik	2026-Q2	97.77	4.41	88.7	Buyer-sourced	2	MARGINAL
AX-2026-043118	SSA	SSA-2605-G6892	PeptideMeter	2026-Q2	98.96	3.25	98.7	Buyer-sourced	0	PASS
AX-2026-042924	MKM	MKM-2511-N3837	Nordanalyt	2026-Q2	98.78	7.43	—	Buyer-sourced	0	PASS

Other recent SinoPep records in the index.
Report	Compound	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-041867	CJC-1295 with DAC	SNP-2607-C3886	Janoshik	2026-Q3	99.24	5.12	—	Laboratory-retained	1	FAIL
AX-2026-041913	Ipamorelin	SNP-2606-L4478	PeptideMeter	2026-Q3	98.88	5.28	—	Buyer-sourced	0	FAIL
AX-2026-041914	Ipamorelin	SNP-2606-L4478	Janoshik	2026-Q3	99.14	5.49	—	Buyer-sourced	0	PASS
AX-2026-041909	Ipamorelin	SNP-2606-L4478	PeptideMeter	2026-Q3	99.00	5.48	89.5	Buyer-sourced	1	MARGINAL
AX-2026-041895	Ipamorelin	SNP-2602-B3833	Janoshik	2026-Q3	99.93	4.72	105.9	Buyer-sourced	1	MARGINAL
AX-2026-041930	IGF-1 LR3	SNP-2606-D4620	Medutest	2026-Q3	98.54	5.37	93.8	Buyer-sourced	0	PASS
AX-2026-041898	Ipamorelin	SNP-2602-B3833	Nordanalyt	2026-Q3	99.93	4.54	96.0	Buyer-sourced	1	MARGINAL
AX-2026-041931	IGF-1 LR3	SNP-2606-D4620	PeptideMeter	2026-Q3	97.93	5.19	93.4	Buyer-sourced	0	PASS