AX-2026-043562 · Liraglutide · SIG lot SIG-2508-6459

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	98.57	% area	≥ 97.5	PASS
Total impurities	RP-HPLC, sum of reported peaks	1.43	% area	≤ 2.5	PASS
Largest single impurity	RP-HPLC — des-palmitoyl liraglutide (−238 Da)	0.52	% area	≤ 1.00	PASS
Identity — theoretical monoisotopic mass	calculated from molecular formula	3748.9631	Da	—	NOT TESTED
Identity — observed monoisotopic mass	LC-MS, unit resolution (single quadrupole)	3748.9942	Da	—	NOT TESTED
Mass accuracy	observed vs theoretical	+8.3	ppm	± 15	PASS
Total peptide content	by difference from the gravimetric mass balance	86.52	%w/w	—	NOT TESTED
Target-compound content	total peptide content × purity	85.28	%w/w	—	NOT TESTED
Gross fill (as weighed)	five-place balance, under nitrogen	15.59	mg	15 mg declared	NOT TESTED
Recovered target peptide	gross fill × target content	13.295	mg	15 mg claim	NOT TESTED
Recovery against label claim	recovered ÷ claim	88.6	%	90.0 – 110.0	FAIL
Water content	Karl Fischer, coulometric, duplicate	5.74	%	≤ 8.0	PASS
Counter-ion (TFA)	anion-exchange ion chromatography	6.75	%	≤ 12.0	PASS
Residual solvent + inorganic residue	estimated — see /methods/residual-solvents-q3c/	0.99	%	—	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 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	3.65	—	2.5 – 8.0	PASS
Retention time (observed)	RP-HPLC, 25 min gradient	14.62	min	14.63 ± 0.40 (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	41,243	—	≥ 20,000	PASS
Resolution to nearest impurity	vs γ-Glu regioisomer	1.16	—	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 41,243, 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 0.52 % impurity against a 98.57 % 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	Liraglutide — main peak	14.62	4,790,808	98.57	—
2	des-palmitoyl liraglutide (−238 Da)	11.75	25,274	0.52	-238.230
3	des-His1 truncate (−137 Da)	13.77	24,788	0.51	-137.059
4	γ-Glu regioisomer	14.96	13,609	0.28	0.000
5	deamidated (Asn→Asp, +1 Da)	14.22	3,888	0.08	+0.984
6	palmitoyl bis-adduct (+238 Da)	17.02	1,458	0.03	+238.230
7	liraglutide dimer	17.24	486	0.01	+3748.963
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 3748.9631 Da, computed from C172H265N43O51. 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 3748.9942 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+	625.8345	625.8396	0.0051	7.9
5+	750.7999	750.8061	0.0062	60.0
4+	938.2481	938.2558	0.0077	100.0
3+	1250.6616	1250.6720	0.0104	57.6
2+	1875.4888	1875.5044	0.0156	8.1

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	5.74
Counter-ion (TFA)	ion chromatography	6.75
Residual solvent + inorganic residue	estimated	0.99
Total peptide content	by difference	86.52
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)	98.74	98.57	divergence +0.26 pp vs batch median
Total impurities (% area)	1.26	1.43
Largest single impurity (% area)	0.75	0.52
Water (%)	not stated	5.74
Counter-ion (%)	not stated	6.75
Peptide content (%w/w)	not stated	86.52
Endotoxin (EU/mg)	not stated	not determined
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 → third-party forwarder (12 d) → laboratory (courier, cold pack, 10 d) → assay.
Assay date: 09 Feb 2026
Submitted to the index: 13 Feb 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 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 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.

chain_custody13 Feb 2026

Custody from checkout to injection is documented on this record. Provenance plus custody is what makes a single result generalise past the vial it came from.

epitalon_bAsp13 Feb 2026

A beta-aspartyl isomer sits a tenth of a minute away and is mass-identical. That is the archetype of a pair where resolution is a compound property and no rule should adjudicate it.

Section 7

Related records

Same batch — lot SIG-2508-6459 n=7

Report	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-043559	SIG-2508-6459	VendorInvestigate	2026-Q1	97.66	5.90	—	Buyer-sourced	0	PASS
AX-2026-043560	SIG-2508-6459	VendorInvestigate	2026-Q1	98.48	4.85	98.8	Laboratory-retained	0	PASS
AX-2026-043561	SIG-2508-6459	Janoshik	2026-Q1	98.14	5.50	101.8	Buyer-sourced	0	PASS
AX-2026-043563	SIG-2508-6459	Janoshik	2026-Q1	98.71	4.90	92.5	Supplier-supplied	1	MARGINAL
AX-2026-043564	SIG-2508-6459	PeptideMeter	2026-Q1	97.90	5.48	95.6	Buyer-sourced	0	PASS
AX-2026-043565	SIG-2508-6459	Kestrel	2026-Q1	99.06	5.02	—	Buyer-sourced	0	PASS

Batch rollup and reproducibility assessment →

Cross-sections

Other recent Liraglutide records in the index.
Report	Supplier	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-041275	WWB	WWB-2607-X2189	Nordanalyt	2026-Q3	99.33	4.39	—	Buyer-sourced	1	MARGINAL
AX-2026-043295	CPC	CPC-2602-G9942	Janoshik	2026-Q3	97.34	5.17	106.3	Buyer-sourced	0	FAIL
AX-2026-041271	WWB	WWB-2607-X2189	Medutest	2026-Q3	99.52	4.57	97.4	Buyer-sourced	1	MARGINAL
AX-2026-043297	CPC	CPC-2602-G9942	Janoshik	2026-Q3	97.01	4.95	103.5	Buyer-sourced	0	FAIL
AX-2026-041273	WWB	WWB-2607-X2189	Janoshik	2026-Q3	99.31	5.52	104.8	Buyer-sourced	1	MARGINAL
AX-2026-041272	WWB	WWB-2607-X2189	Janoshik	2026-Q3	99.28	5.43	97.4	Buyer-sourced	1	MARGINAL
AX-2026-043298	CPC	CPC-2602-G9942	VendorInvestigate	2026-Q3	97.20	5.01	95.4	Buyer-sourced	0	FAIL
AX-2026-041274	WWB	WWB-2607-X2189	Janoshik	2026-Q3	99.26	4.57	—	Buyer-sourced	1	MARGINAL

Other recent SIG records in the index.
Report	Compound	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-043535	GHRP-2	SIG-2603-6031	Janoshik	2026-Q3	99.12	1.26	105.7	Buyer-sourced	0	PASS
AX-2026-043541	GHRP-2	SIG-2603-6031	PeptideMeter	2026-Q3	99.06	2.08	107.4	Buyer-sourced	1	MARGINAL
AX-2026-043539	GHRP-2	SIG-2603-6031	Janoshik	2026-Q3	98.95	1.74	100.4	Buyer-sourced	1	FAIL
AX-2026-043534	GHRP-2	SIG-2603-6031	Medutest	2026-Q3	99.11	2.15	89.8	Buyer-sourced	1	MARGINAL
AX-2026-043542	GHRP-2	SIG-2603-6031	VendorInvestigate	2026-Q3	99.05	1.43	—	Buyer-sourced	1	FAIL
AX-2026-043543	GHRP-2	SIG-2603-6031	Janoshik	2026-Q3	99.38	1.70	98.6	Buyer-sourced	0	PASS
AX-2026-043544	GHRP-2	SIG-2603-6031	PeptideMeter	2026-Q3	99.57	1.51	105.4	Buyer-sourced	0	PASS
AX-2026-043538	GHRP-2	SIG-2603-6031	Kestrel	2026-Q3	98.93	1.72	—	Buyer-sourced	0	FAIL