AX-2026-041712 · Tirzepatide · TFS lot TFS-{CAT}-1353

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, 32 min gradient, 214 nm	97.90	% area	≥ 97.0	PASS
Total impurities	RP-HPLC, sum of reported peaks	2.10	% area	≤ 3.0	PASS
Largest single impurity	RP-HPLC — [D-Aib13]-diastereomer	1.42	% area	≤ 1.00	FAIL
Identity — theoretical monoisotopic mass	calculated from molecular formula	4810.4103	Da	—	NOT TESTED
Identity — observed monoisotopic mass	LC-MS, high resolution (ESI-TOF/QTOF)	4810.4137	Da	—	NOT TESTED
Mass accuracy	observed vs theoretical	+0.7	ppm	± 15	PASS
Total peptide content	by difference from the gravimetric mass balance	89.51	%w/w	—	NOT TESTED
Target-compound content	total peptide content × purity	87.63	%w/w	—	NOT TESTED
Gross fill (as weighed)	five-place balance, under nitrogen	30.41	mg	30 mg declared	NOT TESTED
Recovered target peptide	gross fill × target content	26.648	mg	30 mg claim	NOT TESTED
Recovery against label claim	recovered ÷ claim	88.8	%	90.0 – 110.0	FAIL
Water content	Karl Fischer, coulometric, duplicate	4.07	%	≤ 8.0	PASS
Counter-ion (TFA)	anion-exchange ion chromatography	5.57	%	≤ 12.0	PASS
Residual solvent + inorganic residue	estimated — see /methods/residual-solvents-q3c/	0.85	%	—	NOT TESTED
Endotoxin	kinetic chromogenic LAL	1.80	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	3.99	—	2.5 – 8.0	PASS
Retention time (observed)	RP-HPLC, 32 min gradient	21.11	min	21.08 ± 0.45 (normalised)	PASS
Peak asymmetry (10 % height)	Ph. Eur. 2.2.46	1.36	—	0.80 – 1.50	PASS
Plate count, main peak	N = 5.54 (t/w½)²	78,221	—	≥ 20,000	PASS
Resolution to nearest impurity	vs [D-Aib13]-diastereomer	0.65	—	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, 32 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 78,221, and skew follows the reported asymmetry factor of 1.36. 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 1.42 % impurity against a 97.90 % 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	21.11	4,758,243	97.90	—
2	[D-Aib13]-diastereomer	20.91	69,016	1.42	0.000
3	des-Aib2 analogue	20.74	19,927	0.41	-85.053
4	C20 diacid mono-amide	22.84	7,290	0.15	+0.984
5	des-Gly deletion (−57 Da)	20.46	3,402	0.07	-57.021
6	truncated (3-39)	19.53	1,944	0.04	-222.112
7	trifluoroacetyl adduct (+96 Da)	22.10	486	0.01	+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 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 4810.4137 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	688.2092	0.0005	8.5
6+	802.7423	802.7429	0.0006	56.2
5+	963.0893	963.0900	0.0007	100.0
4+	1203.6099	1203.6107	0.0008	57.8
3+	1604.4774	1604.4785	0.0011	8.8

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	4.07
Counter-ion (TFA)	ion chromatography	5.57
Residual solvent + inorganic residue	estimated	0.85
Total peptide content	by difference	89.51
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)	98.91	97.90	divergence -0.05 pp vs batch median
Total impurities (% area)	1.09	2.10
Largest single impurity (% area)	0.57	1.42
Water (%)	2.8	4.07
Counter-ion (%)	not stated	5.57
Peptide content (%w/w)	not stated	89.51
Endotoxin (EU/mg)	not stated	1.80
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, 23 d) → laboratory (courier, ambient, 3 d) → assay.
Assay date: 20 Jan 2026
Submitted to the index: 30 Jan 2026
Laboratory: VendorInvestigate, Riga, Latvia
Method basis: 32 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.

ms_confirm30 Jan 2026

+0.7 ppm at this mass is a clean identity confirmation. With retention at 21.11 min, Tirzepatide is established as the species measured. Note what it does not exclude: a mass-identical diastereomer, which no mass measurement of any resolution can.

isotope_cluster30 Jan 2026

Identity confirmed and purity at 97.90 %. The two answer different questions — what it is, and how much else is in it — and a record carrying both is the version worth citing.

Section 7

Related records

Same batch — lot TFS-{CAT}-1353 n=14

Report	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Result
AX-2026-041709	TFS-{CAT}-1353	VendorInvestigate	2026-Q1	99.60	4.28	—	Buyer-sourced	PASS
AX-2026-041710	TFS-{CAT}-1353	Janoshik	2026-Q1	99.06	4.25	102.7	Buyer-sourced	PASS
AX-2026-041711	TFS-{CAT}-1353	Janoshik	2026-Q1	98.44	4.82	97.5	Buyer-sourced	PASS
AX-2026-041713	TFS-{CAT}-1353	Janoshik	2026-Q1	98.91	4.19	100.3	Buyer-sourced	PASS
AX-2026-041714	TFS-{CAT}-1353	Janoshik	2026-Q1	99.28	4.52	—	Buyer-sourced	PASS
AX-2026-041715	TFS-{CAT}-1353	Janoshik	2026-Q1	99.06	4.32	99.9	Buyer-sourced	PASS
AX-2026-041716	TFS-{CAT}-1353	PeptideMeter	2026-Q1	99.01	4.43	—	Buyer-sourced	PASS
AX-2026-041717	TFS-{CAT}-1353	Kestrel	2026-Q1	99.54	4.75	—	Buyer-sourced	PASS
AX-2026-041718	TFS-{CAT}-1353	Janoshik	2026-Q1	98.40	4.29	99.7	Buyer-sourced	PASS
AX-2026-041719	TFS-{CAT}-1353	Janoshik	2026-Q1	98.57	4.63	106.2	Buyer-sourced	PASS
AX-2026-041720	TFS-{CAT}-1353	PeptideMeter	2026-Q1	98.73	4.02	107.4	Buyer-sourced	PASS
AX-2026-041721	TFS-{CAT}-1353	Nordanalyt	2026-Q1	98.77	4.58	—	Buyer-sourced	PASS
AX-2026-041722	TFS-{CAT}-1353	Janoshik	2026-Q1	99.22	4.88	—	Buyer-sourced	PASS

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 TFS records in the index.
Report	Compound	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-041681	CJC-1295 with DAC	TFS-{CAT}-9675	PeptideMeter	2026-Q3	98.82	3.67	—	Buyer-sourced	0	PASS
AX-2026-041766	BPC-157	TFS-{CAT}-1156	Janoshik	2026-Q3	99.54	6.34	—	Buyer-sourced	1	MARGINAL
AX-2026-041682	CJC-1295 with DAC	TFS-{CAT}-9675	Nordanalyt	2026-Q3	98.94	3.24	—	Buyer-sourced	0	PASS
AX-2026-041683	CJC-1295 with DAC	TFS-{CAT}-9675	Medutest	2026-Q3	98.68	3.46	97.0	Buyer-sourced	0	PASS
AX-2026-041765	BPC-157	TFS-{CAT}-1156	Janoshik	2026-Q3	99.79	6.01	—	Buyer-sourced	0	PASS
AX-2026-041680	CJC-1295 with DAC	TFS-{CAT}-9675	Medutest	2026-Q3	99.18	2.85	100.4	Buyer-sourced	0	PASS
AX-2026-041691	Semaglutide	TFS-{CAT}-9744	Janoshik	2026-Q2	98.31	6.07	91.4	Buyer-sourced	0	PASS
AX-2026-041700	SS-31 (Elamipretide)	TFS-{CAT}-1142	Medutest	2026-Q2	99.75	2.27	96.3	Buyer-sourced	0	PASS