AX-2025-019157 · LL-37 · SinoPep lot SNP-2411-X3762

Section 1

Results

Measured against the index acceptance specification for the tissue-repair and immunomodulatory 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, 25 min gradient, 214 nm	98.80	% area	≥ 96.5	PASS
Total impurities	RP-HPLC, sum of reported peaks	1.20	% area	≤ 3.5	PASS
Largest single impurity	RP-HPLC — des-Leu1 (−113 Da)	0.74	% area	≤ 1.00	PASS
Identity — theoretical monoisotopic mass	calculated from molecular formula	4490.4265	Da	—	NOT TESTED
Identity — observed monoisotopic mass	LC-MS, unit resolution (single quadrupole)	4490.3942	Da	—	NOT TESTED
Mass accuracy	observed vs theoretical	-7.2	ppm	± 15	PASS
Total peptide content	by difference from the gravimetric mass balance	90.29	%w/w	—	NOT TESTED
Target-compound content	total peptide content × purity	89.21	%w/w	—	NOT TESTED
Gross fill (as weighed)	five-place balance, under nitrogen	10.63	mg	10 mg declared	NOT TESTED
Recovered target peptide	gross fill × target content	9.483	mg	10 mg claim	NOT TESTED
Recovery against label claim	recovered ÷ claim	94.8	%	90.0 – 110.0	PASS
Water content	Karl Fischer, coulometric, duplicate	3.15	%	≤ 10.0	PASS
Counter-ion (TFA)	anion-exchange ion chromatography	6.36	%	≤ 12.0	PASS
Residual solvent + inorganic residue	estimated — see /methods/residual-solvents-q3c/	0.20	%	—	NOT TESTED
Endotoxin	kinetic chromogenic LAL	0.51	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	Faint haze, clearing on standing	—	clear, no visible particulates	FAIL
pH (reconstituted, 1 mg/mL)	potentiometric, two-point calibration	3.04	—	2.5 – 8.0	PASS
Retention time (observed)	RP-HPLC, 25 min gradient	12.08	min	12.16 ± 0.40 (normalised)	PASS
Peak asymmetry (10 % height)	Ph. Eur. 2.2.46	0.86	—	0.80 – 1.50	PASS
Plate count, main peak	N = 5.54 (t/w½)²	68,521	—	≥ 20,000	PASS
Resolution to nearest impurity	vs deamidated (+1 Da)	1.15	—	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 68,521, and skew follows the reported asymmetry factor of 0.86. 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 0.74 % impurity against a 98.80 % 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	LL-37 — main peak	12.08	4,801,986	98.80	—
2	des-Leu1 (−113 Da)	11.76	35,966	0.74	-113.084
3	deamidated (+1 Da)	11.86	15,067	0.31	+0.984
4	trifluoroacetyl adduct (+96 Da)	12.78	3,402	0.07	+95.982
5	truncated (1-31)	10.68	2,430	0.05	-709.401
6	aggregated multimer	14.46	1,458	0.03	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 3

Mass spectrum and identity

Theoretical monoisotopic mass 4490.4265 Da, computed from C205H340N60O53. 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 4490.3942 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+	749.4117	749.4063	-0.0054	8.2
5+	899.0926	899.0861	-0.0065	52.8
4+	1123.6139	1123.6058	-0.0081	100.0
3+	1497.8161	1497.8053	-0.0108	54.0

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	3.15
Counter-ion (TFA)	ion chromatography	6.36
Residual solvent + inorganic residue	estimated	0.20
Total peptide content	by difference	90.29
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	98.80	divergence +0.20 pp vs batch median
Total impurities (% area)	0.50	1.20
Largest single impurity (% area)	0.29	0.74
Water (%)	1.8	3.15
Counter-ion (%)	7.3	6.36
Peptide content (%w/w)	90.3	90.29
Endotoxin (EU/mg)	not stated	0.51
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, 20 d) → laboratory (courier, ambient, 12 d) → assay.
Assay date: 27 Jan 2025
Submitted to the index: 12 Feb 2025
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 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_custody12 Feb 2025

A retail vial at 98.80 % is worth more evidentially than a selected vial at a higher figure. That is the whole argument for recording provenance at all.

sole_source12 Feb 2025

On compounds with a single supplier, independently purchased records are the only thing preventing the evidence base from being entirely supplier-generated. They matter disproportionately there.

Section 7

Related records

Same batch — lot SNP-2411-X3762 n=9

Report	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2025-019153	SNP-2411-X3762	Janoshik	2025-Q1	99.38	2.17	91.6	Buyer-sourced	1	MARGINAL
AX-2025-019154	SNP-2411-X3762	Janoshik	2025-Q1	98.65	2.63	—	Buyer-sourced	1	MARGINAL
AX-2025-019155	SNP-2411-X3762	Janoshik	2025-Q1	99.63	3.28	94.1	Buyer-sourced	1	MARGINAL
AX-2025-019156	SNP-2411-X3762	Janoshik	2025-Q1	99.40	2.58	99.2	Buyer-sourced	1	MARGINAL
AX-2025-019158	SNP-2411-X3762	PeptideMeter	2025-Q1	98.93	3.03	93.9	Buyer-sourced	1	MARGINAL
AX-2025-019159	SNP-2411-X3762	Nordanalyt	2025-Q1	98.90	2.77	96.0	Buyer-sourced	1	MARGINAL
AX-2025-019160	SNP-2411-X3762	Medutest	2025-Q1	99.30	2.73	102.0	Laboratory-retained	1	MARGINAL
AX-2025-019161	SNP-2411-X3762	PeptideMeter	2025-Q1	99.30	2.58	—	Buyer-sourced	1	MARGINAL

Batch rollup and reproducibility assessment →

Cross-sections

Other recent LL-37 records in the index.
Report	Supplier	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-042473	Homopeptide	HOMO-2602-G5165	Janoshik	2026-Q3	99.01	5.00	—	Buyer-sourced	0	PASS
AX-2026-042474	Homopeptide	HOMO-2602-G5165	Janoshik	2026-Q3	99.18	5.44	—	Buyer-sourced	0	PASS
AX-2026-042472	Homopeptide	HOMO-2602-G5165	Nordanalyt	2026-Q3	98.75	5.17	—	Buyer-sourced	0	PASS
AX-2025-019154	SinoPep	SNP-2411-X3762	Janoshik	2025-Q1	98.65	2.63	—	Buyer-sourced	1	MARGINAL
AX-2025-019153	SinoPep	SNP-2411-X3762	Janoshik	2025-Q1	99.38	2.17	91.6	Buyer-sourced	1	MARGINAL
AX-2025-019155	SinoPep	SNP-2411-X3762	Janoshik	2025-Q1	99.63	3.28	94.1	Buyer-sourced	1	MARGINAL
AX-2025-019159	SinoPep	SNP-2411-X3762	Nordanalyt	2025-Q1	98.90	2.77	96.0	Buyer-sourced	1	MARGINAL
AX-2025-019160	SinoPep	SNP-2411-X3762	Medutest	2025-Q1	99.30	2.73	102.0	Laboratory-retained	1	MARGINAL

Other recent SinoPep records in the index.
Report	Compound	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-041867	CJC-1295 with DAC	SNP-2607-C3886	Janoshik	2026-Q3	99.24	5.12	—	Laboratory-retained	1	FAIL
AX-2026-041913	Ipamorelin	SNP-2606-L4478	PeptideMeter	2026-Q3	98.88	5.28	—	Buyer-sourced	0	FAIL
AX-2026-041914	Ipamorelin	SNP-2606-L4478	Janoshik	2026-Q3	99.14	5.49	—	Buyer-sourced	0	PASS
AX-2026-041909	Ipamorelin	SNP-2606-L4478	PeptideMeter	2026-Q3	99.00	5.48	89.5	Buyer-sourced	1	MARGINAL
AX-2026-041895	Ipamorelin	SNP-2602-B3833	Janoshik	2026-Q3	99.93	4.72	105.9	Buyer-sourced	1	MARGINAL
AX-2026-041930	IGF-1 LR3	SNP-2606-D4620	Medutest	2026-Q3	98.54	5.37	93.8	Buyer-sourced	0	PASS
AX-2026-041898	Ipamorelin	SNP-2602-B3833	Nordanalyt	2026-Q3	99.93	4.54	96.0	Buyer-sourced	1	MARGINAL
AX-2026-041931	IGF-1 LR3	SNP-2606-D4620	PeptideMeter	2026-Q3	97.93	5.19	93.4	Buyer-sourced	0	PASS