AX-2026-042432 · IGF-1 DES (1-3) · SWB lot SWB-2601-Y5870

Section 1

Results

Measured against the index acceptance specification for the growth-hormone axis peptides 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, 35 min gradient, 214 nm	97.56	% area	≥ 95.0	PASS
Total impurities	RP-HPLC, sum of reported peaks	2.44	% area	≤ 5.0	PASS
Largest single impurity	RP-HPLC — full-length IGF-1 (+343 Da)	1.22	% area	≤ 1.00	FAIL
Identity — theoretical monoisotopic mass	calculated from molecular formula	7365.7188	Da	—	NOT TESTED
Identity — observed monoisotopic mass	LC-MS, high resolution (ESI-TOF/QTOF)	7365.7763	Da	—	NOT TESTED
Mass accuracy	observed vs theoretical	+7.8	ppm	± 15	PASS
Peptide content	not ordered on this submission	not determined	—	required to check label claim	NOT TESTED
Water content	Karl Fischer, coulometric, duplicate	4.26	%	≤ 9.0	PASS
Counter-ion (acetate)	anion-exchange ion chromatography	5.74	%	≤ 12.0	PASS
Residual solvent + inorganic residue	estimated — see /methods/residual-solvents-q3c/	0.30	%	—	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	5.62	—	2.5 – 8.0	PASS
Retention time (observed)	RP-HPLC, 35 min gradient	18.71	min	18.29 ± 0.50 (normalised)	PASS
Peak asymmetry (10 % height)	Ph. Eur. 2.2.46	1.22	—	0.80 – 1.50	PASS
Plate count, main peak	N = 5.54 (t/w½)²	45,387	—	≥ 20,000	PASS
Resolution to nearest impurity	vs des(1-4) over-truncate (−87 Da)	1.17	—	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, 35 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 45,387, and skew follows the reported asymmetry factor of 1.22. 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 1.22 % impurity against a 97.56 % 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	IGF-1 DES (1-3) — main peak	18.71	4,741,718	97.56	—
2	full-length IGF-1 (+343 Da)	19.27	59,296	1.22	+342.166
3	disulfide-scrambled isomer	19.39	34,022	0.70	0.000
4	des(1-4) over-truncate (−87 Da)	18.29	13,609	0.28	-87.032
5	aggregated dimer	22.27	11,665	0.24	+7365.719
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 7365.7188 Da, computed from C317H508N92O95S7. 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 7365.7763 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 (%)
9+	819.4205	819.4269	0.0064	7.6
8+	921.7221	921.7293	0.0072	57.3
7+	1053.2528	1053.2610	0.0082	100.0
6+	1228.6271	1228.6367	0.0096	54.0
5+	1474.1510	1474.1625	0.0115	8.2

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.

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	97.56	divergence +0.79 pp vs batch median
Total impurities (% area)	0.96	2.44
Largest single impurity (% area)	not stated	1.22
Water (%)	2.7	4.26
Counter-ion (%)	not stated	5.74
Peptide content (%w/w)	not stated	not determined
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 (2–8 °C, 18 d) → laboratory (courier, ambient, 9 d) → assay.
Assay date: 12 Jun 2026
Submitted to the index: 13 Jun 2026
Laboratory: Nordanalyt Laboratories, Uppsala, Sweden
Method basis: 35 min gradient · high-resolution MS
Verification status: IDENTITY CONSISTENT

What this report does not establish

How much of the named compound is in the vial. Peptide content was not determined, so recovered mass cannot be calculated and the label claim cannot be checked.
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 the protein is correctly folded. Reverse-phase chromatography measures hydrophobic heterogeneity. A correctly-massed, chromatographically-homogeneous recombinant protein can be entirely mis-paired at its disulfides. Purity here is an upper bound and nothing more.
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 SWB-2601-Y5870 n=14

Report	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-042428	SWB-2601-Y5870	PeptideMeter	2026-Q2	98.74	3.82	—	Supplier-supplied	1	MARGINAL
AX-2026-042429	SWB-2601-Y5870	Janoshik	2026-Q2	98.11	4.09	97.0	Supplier-supplied	1	MARGINAL
AX-2026-042430	SWB-2601-Y5870	PeptideMeter	2026-Q2	97.95	3.81	—	Supplier-supplied	2	MARGINAL
AX-2026-042431	SWB-2601-Y5870	Janoshik	2026-Q2	98.27	4.14	—	Supplier-supplied	1	MARGINAL
AX-2026-042433	SWB-2601-Y5870	PeptideMeter	2026-Q2	98.32	3.49	97.0	Supplier-supplied	2	MARGINAL
AX-2026-042434	SWB-2601-Y5870	Janoshik	2026-Q2	98.00	4.05	—	Supplier-supplied	1	MARGINAL
AX-2026-042435	SWB-2601-Y5870	VendorInvestigate	2026-Q2	97.54	3.91	—	Buyer-sourced	1	MARGINAL
AX-2026-042436	SWB-2601-Y5870	Janoshik	2026-Q2	97.68	4.32	95.0	Supplier-supplied	1	MARGINAL
AX-2026-042437	SWB-2601-Y5870	Janoshik	2026-Q2	97.72	4.18	98.0	Buyer-sourced	1	MARGINAL
AX-2026-042438	SWB-2601-Y5870	Janoshik	2026-Q2	97.94	3.70	—	Laboratory-retained	2	MARGINAL
AX-2026-042439	SWB-2601-Y5870	PeptideMeter	2026-Q2	97.76	3.79	—	Buyer-sourced	1	MARGINAL
AX-2026-042440	SWB-2601-Y5870	Janoshik	2026-Q2	97.88	4.00	98.0	Supplier-supplied	1	MARGINAL
AX-2026-042441	SWB-2601-Y5870	Janoshik	2026-Q2	98.55	4.26	—	Supplier-supplied	2	MARGINAL

Batch rollup and reproducibility assessment →

Cross-sections

Other recent IGF-1 DES (1-3) records in the index.
Report	Supplier	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-042428	SWB	SWB-2601-Y5870	PeptideMeter	2026-Q2	98.74	3.82	—	Supplier-supplied	1	MARGINAL
AX-2026-042429	SWB	SWB-2601-Y5870	Janoshik	2026-Q2	98.11	4.09	97.0	Supplier-supplied	1	MARGINAL
AX-2026-042437	SWB	SWB-2601-Y5870	Janoshik	2026-Q2	97.72	4.18	98.0	Buyer-sourced	1	MARGINAL
AX-2026-042434	SWB	SWB-2601-Y5870	Janoshik	2026-Q2	98.00	4.05	—	Supplier-supplied	1	MARGINAL
AX-2026-042441	SWB	SWB-2601-Y5870	Janoshik	2026-Q2	98.55	4.26	—	Supplier-supplied	2	MARGINAL
AX-2026-042438	SWB	SWB-2601-Y5870	Janoshik	2026-Q2	97.94	3.70	—	Laboratory-retained	2	MARGINAL
AX-2026-042440	SWB	SWB-2601-Y5870	Janoshik	2026-Q2	97.88	4.00	98.0	Supplier-supplied	1	MARGINAL
AX-2026-042430	SWB	SWB-2601-Y5870	PeptideMeter	2026-Q2	97.95	3.81	—	Supplier-supplied	2	MARGINAL

Other recent SWB records in the index.
Report	Compound	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-042461	Kisspeptin-10	SWB-2603-D6238	Janoshik	2026-Q3	98.35	4.65	96.5	Supplier-supplied	3	FAIL
AX-2026-042479	Melanotan II	SWB-2603-A5707	Janoshik	2026-Q3	99.16	3.67	94.5	Supplier-supplied	1	MARGINAL
AX-2026-042481	Melanotan II	SWB-2603-A5707	Medutest	2026-Q3	98.95	3.37	90.8	Supplier-supplied	1	MARGINAL
AX-2026-042460	Kisspeptin-10	SWB-2603-D6238	Kestrel	2026-Q3	99.55	4.21	90.8	Supplier-supplied	3	MARGINAL
AX-2026-042483	Melanotan II	SWB-2603-A5707	Janoshik	2026-Q3	99.38	3.73	107.2	Supplier-supplied	1	MARGINAL
AX-2026-042398	Semaglutide	SWB-2602-X5278	Nordanalyt	2026-Q3	99.08	4.48	—	Supplier-supplied	1	MARGINAL
AX-2026-042399	Semaglutide	SWB-2602-X5278	Janoshik	2026-Q3	98.56	3.82	—	Supplier-supplied	1	MARGINAL
AX-2026-042499	BPC-157	SWB-2607-Y5787	Kestrel	2026-Q3	99.93	4.25	94.4	Supplier-supplied	0	PASS