AX-2026-041949 · Tirzepatide · AMB lot AMB-2602-L4999

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	99.58	% area	≥ 97.0	PASS
Total impurities	RP-HPLC, sum of reported peaks	0.42	% area	≤ 3.0	PASS
Largest single impurity	RP-HPLC — tirzepatide dimer	0.27	% area	≤ 1.00	PASS
Identity	not ordered on this submission	not determined	—	required for VERIFIED status	NOT TESTED
Total peptide content	by difference from the gravimetric mass balance	88.72	%w/w	—	NOT TESTED
Target-compound content	total peptide content × purity	88.35	%w/w	—	NOT TESTED
Gross fill (as weighed)	five-place balance, under nitrogen	5.98	mg	5 mg declared	NOT TESTED
Recovered target peptide	gross fill × target content	5.283	mg	5 mg claim	NOT TESTED
Recovery against label claim	recovered ÷ claim	105.7	%	90.0 – 110.0	PASS
Water content	Karl Fischer, coulometric, duplicate	4.30	%	≤ 8.0	PASS
Counter-ion (TFA)	anion-exchange ion chromatography	6.36	%	≤ 12.0	PASS
Residual solvent + inorganic residue	estimated — see /methods/residual-solvents-q3c/	0.62	%	—	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	White cake, partially collapsed	—	white to off-white intact cake	FAIL
Reconstitution clarity	reconstituted per submitter procedure	Faint haze, clearing on standing	—	clear, no visible particulates	FAIL
pH (reconstituted, 1 mg/mL)	potentiometric, two-point calibration	3.61	—	2.5 – 8.0	PASS
Retention time (observed)	RP-HPLC, 30 min gradient	19.84	min	19.86 ± 0.45 (normalised)	PASS
Peak asymmetry (10 % height)	Ph. Eur. 2.2.46	1.10	—	0.80 – 1.50	PASS
Plate count, main peak	N = 5.54 (t/w½)²	39,608	—	≥ 20,000	PASS
Resolution to nearest impurity	vs [D-Aib13]-diastereomer	0.46	—	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 39,608, and skew follows the reported asymmetry factor of 1.10. 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 0.27 % impurity against a 99.58 % 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	19.84	4,839,897	99.58	—
2	tirzepatide dimer	23.82	13,123	0.27	+4810.410
3	des-Gly deletion (−57 Da)	19.23	4,860	0.10	-57.021
4	des-Aib2 analogue	19.49	1,458	0.03	-85.053
5	[D-Aib13]-diastereomer	19.65	972	0.02	0.000
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 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	4.30
Counter-ion (TFA)	ion chromatography	6.36
Residual solvent + inorganic residue	estimated	0.62
Total peptide content	by difference	88.72
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)	99.55	99.58	divergence -0.03 pp vs batch median
Total impurities (% area)	0.45	0.42
Largest single impurity (% area)	0.24	0.27
Water (%)	2.3	4.30
Counter-ion (%)	not stated	6.36
Peptide content (%w/w)	not stated	88.72
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 (−20 °C, 30 d) → laboratory (courier, dry ice, 7 d) → assay.
Assay date: 30 Apr 2026
Submitted to the index: 03 May 2026
Laboratory: Janoshik Analytical, Ostrava, Czechia
Method basis: 30 min gradient · high-resolution MS
Verification status: PURITY ONLY

What this report does not establish

That the compound is the compound named. No identity confirmation was ordered on this submission. A purity figure describes chromatographic homogeneity of whatever eluted; it does not name it.
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 3

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.

peak_integrator03 May 2026

99.58 % on Tirzepatide sits at the top of what this index sees. Read it with the method: Janoshik ran a 30 min gradient here, and the compound fingerprint names a mass-identical species that a shorter run folds into the main peak. On this gradient the figure is well founded.

iso_audit03 May 2026

A certification says what a process is supposed to do. A retail vial says what it did. Both are worth having and only one of them is a measurement.

Contributor #M-368403 May 2026

The index closes its own mass balance to two decimal places here: water 4.30 %, counter-ion 6.36 % TFA, residual and total peptide content account for 100.00 %. That closure is asserted by the build checker rather than by an author.

Section 7

Related records

Same batch — lot AMB-2602-L4999 n=3

Report	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-041947	AMB-2602-L4999	Medutest	2026-Q2	99.69	3.80	—	Buyer-sourced	0	PASS
AX-2026-041948	AMB-2602-L4999	Janoshik	2026-Q2	99.05	3.61	—	Buyer-sourced	0	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 AMB records in the index.
Report	Compound	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-042002	Semaglutide	AMB-2607-N6274	VendorInvestigate	2026-Q3	98.23	6.37	97.1	Buyer-sourced	1	MARGINAL
AX-2026-042012	GHRP-6	AMB-2603-S5667	Janoshik	2026-Q3	99.37	5.90	88.8	Laboratory-retained	1	MARGINAL
AX-2026-041974	Tirzepatide	AMB-2603-C5112	Nordanalyt	2026-Q3	98.20	3.41	—	Buyer-sourced	0	PASS
AX-2026-041975	Tirzepatide	AMB-2603-C5112	Medutest	2026-Q3	97.88	3.45	106.9	Laboratory-retained	0	PASS
AX-2026-042005	Semaglutide	AMB-2607-N6274	PeptideMeter	2026-Q3	98.09	6.48	98.6	Buyer-sourced	1	MARGINAL
AX-2026-042008	Epitalon	AMB-2602-Y6433	Janoshik	2026-Q3	99.30	8.75	105.1	Buyer-sourced	0	PASS
AX-2026-042021	TB-500	AMB-2602-P5987	VendorInvestigate	2026-Q3	99.86	4.79	101.4	Buyer-sourced	0	PASS
AX-2026-042015	GHRP-6	AMB-2603-S5667	Janoshik	2026-Q3	99.54	6.44	97.1	Buyer-sourced	0	PASS