AX-2026-041661 · Semaglutide · QSC lot QSC-2511-M9226

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, 25 min gradient, 214 nm	99.44	% area	≥ 97.0	PASS
Total impurities	RP-HPLC, sum of reported peaks	0.56	% area	≤ 3.0	PASS
Largest single impurity	RP-HPLC — [D-Aib8]-diastereomer	0.24	% area	≤ 1.00	PASS
Identity — theoretical monoisotopic mass	calculated from molecular formula	4111.0524	Da	—	NOT TESTED
Identity — observed monoisotopic mass	LC-MS, unit resolution (single quadrupole)	4111.0372	Da	—	NOT TESTED
Mass accuracy	observed vs theoretical	-3.7	ppm	± 15	PASS
Total peptide content	by difference from the gravimetric mass balance	88.35	%w/w	—	NOT TESTED
Target-compound content	total peptide content × purity	87.86	%w/w	—	NOT TESTED
Gross fill (as weighed)	five-place balance, under nitrogen	11.38	mg	10 mg declared	NOT TESTED
Recovered target peptide	gross fill × target content	9.998	mg	10 mg claim	NOT TESTED
Recovery against label claim	recovered ÷ claim	100.0	%	90.0 – 110.0	PASS
Water content	Karl Fischer, coulometric, duplicate	3.77	%	≤ 8.0	PASS
Counter-ion (TFA)	anion-exchange ion chromatography	7.29	%	≤ 12.0	PASS
Residual solvent + inorganic residue	estimated — see /methods/residual-solvents-q3c/	0.59	%	—	NOT TESTED
Endotoxin	kinetic chromogenic LAL	0.99	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 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	3.94	—	2.5 – 8.0	PASS
Retention time (observed)	RP-HPLC, 25 min gradient	15.38	min	15.60 ± 0.45 (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	59,529	—	≥ 20,000	PASS
Resolution to nearest impurity	vs [D-Aib8]-diastereomer	0.77	—	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, 25 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 59,529, 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 0.24 % impurity against a 99.44 % 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	Semaglutide — main peak	15.38	4,833,092	99.44	—
2	[D-Aib8]-diastereomer	15.18	11,665	0.24	0.000
3	des-AEEA semaglutide (−145 Da)	14.70	10,207	0.21	-145.074
4	Met(O) sulfoxide (+16 Da)	14.81	2,916	0.06	+15.995
5	C18 diacid mono-ester	16.51	2,430	0.05	+14.016
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 4111.0524 Da, computed from C187H291N45O59. All ppm figures on this site are against monoisotopic values — see why that matters.

Figure 2. ESI charge-state envelope, unit-resolution instrument. Sticks are placed at m/z = (M + z × 1.007276)/z for the observed neutral mass of 4111.0372 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 (%)
6+	686.1827	686.1801	-0.0026	8.1
5+	823.2178	823.2147	-0.0031	58.2
4+	1028.7704	1028.7666	-0.0038	100.0
3+	1371.3581	1371.3530	-0.0051	50.7
2+	2056.5335	2056.5259	-0.0076	9.0

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	3.77
Counter-ion (TFA)	ion chromatography	7.29
Residual solvent + inorganic residue	estimated	0.59
Total peptide content	by difference	88.35
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	99.44	divergence +0.46 pp vs batch median
Total impurities (% area)	0.10	0.56
Largest single impurity (% area)	not stated	0.24
Water (%)	2.1	3.77
Counter-ion (%)	not stated	7.29
Peptide content (%w/w)	not stated	88.35
Endotoxin (EU/mg)	not stated	0.99
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: Supplier-supplied
Evidentiary weight: Weaker evidence. Read with the caveat below.
Chain of custody: Supplier despatch → laboratory direct (courier, cold pack, 7 d) → assay. Submitter did not handle the vial.
Assay date: 28 May 2026
Submitted to the index: 10 Jun 2026
Laboratory: Medutest, Ljubljana, Slovenia
Method basis: 25 min gradient · unit-resolution MS
Verification status: IDENTITY CONSISTENT

What this report does not establish

That the compound is not a near-isobaric alternative. Identity was confirmed at unit mass resolution, which cannot exclude species differing by 1 or 2 Da. The specific alternatives not excluded are named in the identity block above.
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

No annotations on this record. Annotations are short signed technical comments from index contributors; see how to contribute.

Section 7

Related records

Same batch — lot QSC-2511-M9226 n=17

Report	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-041655	QSC-2511-M9226	PeptideMeter	2026-Q2	99.48	3.45	104.5	Supplier-supplied	1	MARGINAL
AX-2026-041656	QSC-2511-M9226	Janoshik	2026-Q2	99.67	4.04	94.8	Supplier-supplied	1	MARGINAL
AX-2026-041657	QSC-2511-M9226	Janoshik	2026-Q2	99.53	3.84	97.6	Supplier-supplied	1	MARGINAL
AX-2026-041658	QSC-2511-M9226	Janoshik	2026-Q2	99.60	3.73	—	Supplier-supplied	1	MARGINAL
AX-2026-041659	QSC-2511-M9226	Medutest	2026-Q2	99.10	4.02	105.2	Supplier-supplied	1	MARGINAL
AX-2026-041660	QSC-2511-M9226	Janoshik	2026-Q2	99.11	4.55	—	Supplier-supplied	1	MARGINAL
AX-2026-041662	QSC-2511-M9226	Janoshik	2026-Q2	99.38	3.71	106.0	Supplier-supplied	1	MARGINAL
AX-2026-041663	QSC-2511-M9226	Janoshik	2026-Q2	99.06	4.11	106.7	Laboratory-retained	1	MARGINAL
AX-2026-041664	QSC-2511-M9226	Nordanalyt	2026-Q2	99.70	4.31	96.0	Supplier-supplied	1	MARGINAL
AX-2026-041665	QSC-2511-M9226	PeptideMeter	2026-Q2	99.79	3.66	90.0	Supplier-supplied	1	MARGINAL
AX-2026-041666	QSC-2511-M9226	Nordanalyt	2026-Q2	99.38	4.38	105.4	Supplier-supplied	1	MARGINAL
AX-2026-041667	QSC-2511-M9226	Nordanalyt	2026-Q2	99.53	4.21	—	Supplier-supplied	1	MARGINAL
AX-2026-041668	QSC-2511-M9226	Medutest	2026-Q2	99.70	2.81	—	Supplier-supplied	1	MARGINAL
AX-2026-041669	QSC-2511-M9226	Nordanalyt	2026-Q2	99.22	4.06	94.5	Supplier-supplied	1	MARGINAL
AX-2026-041670	QSC-2511-M9226	Nordanalyt	2026-Q2	98.95	3.39	101.9	Supplier-supplied	1	MARGINAL
AX-2026-041671	QSC-2511-M9226	Janoshik	2026-Q2	99.31	4.07	91.0	Supplier-supplied	1	MARGINAL

Batch rollup and reproducibility assessment →

Cross-sections

Other recent Semaglutide records in the index.
Report	Supplier	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-041334	WWB	WWB-2606-N3192	Janoshik	2026-Q3	98.83	5.04	—	Supplier-supplied	1	MARGINAL
AX-2026-041932	TFC	TFC-2604-X4301	Janoshik	2026-Q3	98.88	4.31	—	Supplier-supplied	0	PASS
AX-2026-042347	HJ	HJ-2608-C3931	VendorInvestigate	2026-Q3	98.80	3.41	100.2	Buyer-sourced	1	MARGINAL
AX-2026-041886	JEEP	JEEP-2607-X3911	Nordanalyt	2026-Q3	99.19	4.03	96.4	Supplier-supplied	2	MARGINAL
AX-2026-041337	WWB	WWB-2606-N3192	Nordanalyt	2026-Q3	98.96	4.81	—	Supplier-supplied	1	MARGINAL
AX-2026-042172	Homopeptide	HOMO-2604-X8921	Janoshik	2026-Q3	99.64	5.16	91.9	Supplier-supplied	1	MARGINAL
AX-2026-041767	FGP	FGP-2602-M1508	PeptideMeter	2026-Q3	98.65	2.54	—	Supplier-supplied	2	FAIL
AX-2026-041882	JEEP	JEEP-2607-X3911	Nordanalyt	2026-Q3	99.17	4.52	—	Supplier-supplied	1	MARGINAL

Other recent QSC records in the index.
Report	Compound	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-041683	CJC-1295 (no DAC)	QSC-2606-V8637	Janoshik	2026-Q3	99.93	3.63	97.1	Supplier-supplied	1	FAIL
AX-2026-041727	CJC-1295 with DAC	QSC-2602-E9474	Janoshik	2026-Q3	98.88	6.62	105.3	Supplier-supplied	1	MARGINAL
AX-2026-041728	CJC-1295 with DAC	QSC-2602-E9474	VendorInvestigate	2026-Q3	98.42	7.04	—	Buyer-sourced	1	MARGINAL
AX-2026-041734	CJC-1295 with DAC	QSC-2602-E9474	Medutest	2026-Q3	99.43	7.17	105.5	Supplier-supplied	2	FAIL
AX-2026-041652	Liraglutide	QSC-2605-W8602	Nordanalyt	2026-Q3	99.33	6.55	—	Supplier-supplied	0	PASS
AX-2026-041730	CJC-1295 with DAC	QSC-2602-E9474	PeptideMeter	2026-Q3	98.79	6.93	95.4	Supplier-supplied	1	MARGINAL
AX-2026-041686	CJC-1295 (no DAC)	QSC-2606-V8637	Janoshik	2026-Q3	99.93	4.04	—	Supplier-supplied	0	PASS
AX-2026-041653	Liraglutide	QSC-2605-W8602	VendorInvestigate	2026-Q3	98.82	5.95	—	Buyer-sourced	0	PASS