AX-2025-020095 · Tirzepatide · SWB lot SWB-2505-R8575

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	98.94	% area	≥ 97.0	PASS
Total impurities	RP-HPLC, sum of reported peaks	1.06	% area	≤ 3.0	PASS
Largest single impurity	RP-HPLC — [D-Aib13]-diastereomer	0.73	% area	≤ 1.00	PASS
Identity — theoretical monoisotopic mass	calculated from molecular formula	4810.4103	Da	—	NOT TESTED
Identity — observed monoisotopic mass	LC-MS, high resolution (ESI-TOF/QTOF)	4810.6061	Da	—	NOT TESTED
Mass accuracy	observed vs theoretical	+40.7	ppm	± 15	FAIL
Total peptide content	by difference from the gravimetric mass balance	90.65	%w/w	—	NOT TESTED
Target-compound content	total peptide content × purity	89.69	%w/w	—	NOT TESTED
Gross fill (as weighed)	five-place balance, under nitrogen	15.32	mg	15 mg declared	NOT TESTED
Recovered target peptide	gross fill × target content	13.741	mg	15 mg claim	NOT TESTED
Recovery against label claim	recovered ÷ claim	91.6	%	90.0 – 110.0	PASS
Water content	Karl Fischer, coulometric, duplicate	2.31	%	≤ 8.0	PASS
Counter-ion (TFA)	anion-exchange ion chromatography	6.56	%	≤ 12.0	PASS
Residual solvent + inorganic residue	estimated — see /methods/residual-solvents-q3c/	0.48	%	—	NOT TESTED
Endotoxin	kinetic chromogenic LAL	0.78	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	3.55	—	2.5 – 8.0	PASS
Retention time (observed)	RP-HPLC, 30 min gradient	19.81	min	19.86 ± 0.45 (normalised)	PASS
Peak asymmetry (10 % height)	Ph. Eur. 2.2.46	1.08	—	0.80 – 1.50	PASS
Plate count, main peak	N = 5.54 (t/w½)²	52,715	—	≥ 20,000	PASS
Resolution to nearest impurity	vs [D-Aib13]-diastereomer	0.54	—	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 52,715, and skew follows the reported asymmetry factor of 1.08. 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 0.73 % impurity against a 98.94 % 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	Tirzepatide — main peak	19.81	4,808,791	98.94	—
2	[D-Aib13]-diastereomer	19.62	35,480	0.73	0.000
3	Met(O) sulfoxide (+16 Da)	19.07	8,263	0.17	+15.995
4	C20 diacid mono-amide	21.43	3,402	0.07	+0.984
5	des-Gly deletion (−57 Da)	19.20	2,430	0.05	-57.021
6	des-Aib2 analogue	19.46	1,944	0.04	-85.053
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 4810.4103 Da, computed from C225H348N48O68. 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 4810.6061 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+	688.2087	688.2367	0.0280	7.7
6+	802.7423	802.7750	0.0327	51.1
5+	963.0893	963.1285	0.0392	100.0
4+	1203.6099	1203.6588	0.0489	56.3
3+	1604.4774	1604.5426	0.0652	8.4

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	2.31
Counter-ion (TFA)	ion chromatography	6.56
Residual solvent + inorganic residue	estimated	0.48
Total peptide content	by difference	90.65
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)	99.5	98.94	divergence +0.46 pp vs batch median
Total impurities (% area)	not stated	1.06
Largest single impurity (% area)	not stated	0.73
Water (%)	2.2	2.31
Counter-ion (%)	not stated	6.56
Peptide content (%w/w)	93.0	90.65
Endotoxin (EU/mg)	0.97	0.78
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 (2–8 °C, 22 d) → laboratory (courier, ambient, 7 d) → assay.
Assay date: 14 Jun 2025
Submitted to the index: 20 Jun 2025
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 5

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.

isotope_cluster20 Jun 2025

Check whether the reported mass is monoisotopic or average. At this molecular weight the two differ by considerably more than the +40.7 ppm being flagged, and confusing them is the single commonest cause of an apparent mass error on a large peptide.

coa_gap20 Jun 2025

Rounding convention is the least of what a certificate carries. Lot code, method, wavelength and release date are the fields that let a reader reconstruct the figure, and the index scores those separately on the documentation rubric.

quarter_over_quarter20 Jun 2025

If a rounding convention changes mid-series the certificates become non-comparable across the change. Worth checking the timeline page before pooling declared figures from different quarters.

round_numbers20 Jun 2025

Ask for the chromatogram. In every case the index has followed up, one existed, and it carried the unrounded figure.

shared_bulk20 Jun 2025

Fair.

Section 7

Related records

Same batch — lot SWB-2505-R8575 n=13

Report	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2025-020084	SWB-2505-R8575	Medutest	2025-Q2	98.58	2.60	105.5	Buyer-sourced	1	MARGINAL
AX-2025-020085	SWB-2505-R8575	Nordanalyt	2025-Q2	98.96	2.94	97.8	Buyer-sourced	1	MARGINAL
AX-2025-020086	SWB-2505-R8575	Janoshik	2025-Q2	98.84	2.51	104.2	Buyer-sourced	1	MARGINAL
AX-2025-020087	SWB-2505-R8575	Janoshik	2025-Q2	99.20	2.74	96.0	Buyer-sourced	1	MARGINAL
AX-2025-020088	SWB-2505-R8575	Nordanalyt	2025-Q2	98.89	2.68	106.0	Buyer-sourced	1	MARGINAL
AX-2025-020089	SWB-2505-R8575	Janoshik	2025-Q2	99.24	2.99	90.2	Buyer-sourced	1	MARGINAL
AX-2025-020090	SWB-2505-R8575	Janoshik	2025-Q2	99.22	2.64	—	Buyer-sourced	1	MARGINAL
AX-2025-020091	SWB-2505-R8575	Janoshik	2025-Q2	99.04	3.26	—	Buyer-sourced	1	MARGINAL
AX-2025-020092	SWB-2505-R8575	Janoshik	2025-Q2	99.21	2.60	89.3	Buyer-sourced	2	MARGINAL
AX-2025-020093	SWB-2505-R8575	Janoshik	2025-Q2	99.09	2.54	102.2	Buyer-sourced	1	MARGINAL
AX-2025-020094	SWB-2505-R8575	Janoshik	2025-Q2	99.01	2.36	—	Buyer-sourced	1	MARGINAL
AX-2025-020096	SWB-2505-R8575	VendorInvestigate	2025-Q2	99.69	3.35	91.9	Buyer-sourced	1	MARGINAL

Batch rollup and reproducibility assessment →

Cross-sections

Other recent Tirzepatide records in the index.
Report	Supplier	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Result
AX-2026-043288	CPC	CPC-2607-L1516	Janoshik	2026-Q3	96.89	5.11	101.1	Laboratory-retained	FAIL
AX-2026-041610	FGP	FGP-2603-L7753	Janoshik	2026-Q3	98.81	2.45	101.0	Buyer-sourced	PASS
AX-2026-041974	AMB	AMB-2603-C5112	Nordanalyt	2026-Q3	98.20	3.41	—	Buyer-sourced	PASS
AX-2026-041975	AMB	AMB-2603-C5112	Medutest	2026-Q3	97.88	3.45	106.9	Laboratory-retained	PASS
AX-2026-041609	FGP	FGP-2603-L7753	Janoshik	2026-Q3	98.52	2.00	98.0	Buyer-sourced	PASS
AX-2026-041978	AMB	AMB-2603-C5112	Janoshik	2026-Q3	97.94	3.57	103.0	Buyer-sourced	PASS
AX-2026-041982	AMB	AMB-2603-C5112	Janoshik	2026-Q3	97.60	4.46	—	Buyer-sourced	PASS
AX-2026-043286	CPC	CPC-2607-L1516	Kestrel	2026-Q3	98.20	4.56	—	Buyer-sourced	PASS

Other recent SWB records in the index.
Report	Compound	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Result
AX-2026-042637	Semaglutide	SWB-2602-X7905	Janoshik	2026-Q3	98.37	4.26	102.9	Buyer-sourced	PASS
AX-2026-042645	Semaglutide	SWB-2602-X7905	Medutest	2026-Q3	98.48	4.52	95.2	Buyer-sourced	PASS
AX-2026-042642	Semaglutide	SWB-2602-X7905	PeptideMeter	2026-Q3	97.96	4.48	90.8	Buyer-sourced	PASS
AX-2026-042640	Semaglutide	SWB-2602-X7905	PeptideMeter	2026-Q3	98.55	4.29	—	Buyer-sourced	PASS
AX-2026-042638	Semaglutide	SWB-2602-X7905	Janoshik	2026-Q3	98.74	3.65	—	Buyer-sourced	PASS
AX-2026-042639	Semaglutide	SWB-2602-X7905	Janoshik	2026-Q3	98.77	4.21	—	Supplier-supplied	PASS
AX-2026-042641	Semaglutide	SWB-2602-X7905	Janoshik	2026-Q3	98.86	4.48	99.1	Buyer-sourced	PASS
AX-2026-042644	Semaglutide	SWB-2602-X7905	PeptideMeter	2026-Q3	98.76	3.57	97.7	Buyer-sourced	PASS