AX-2025-020752

Thymosin α1 · 5 mg declared · Sangon Biotech (Shanghai) Co., Ltd. · lot SGN-2504-P9721

MARGINALIDENTITY CONSISTENT

Report ID: AX-2025-020752
Compound: Thymosin α1
Compound class: Tissue-repair and immunomodulatory peptides
Supplier: SGN — Sangon Biotech (Shanghai) Co., Ltd.
Batch / lot: SGN-2504-P9721
Declared label claim: 5mg
Laboratory: Kestrel Bioanalytical
Assay date: 29 Aug 2025
Submitted: 08 Sep 2025
Quarter: 2025-Q3
Submitter: e.nwosu
Sample provenance: Supplier-supplied

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, 15 min gradient, 214 nm	99.33	% area	≥ 97.5	PASS
Total impurities	RP-HPLC, sum of reported peaks	0.67	% area	≤ 2.5	PASS
Largest single impurity	RP-HPLC — aspartimide (−18 Da)	0.35	% area	≤ 1.00	PASS
Identity — theoretical monoisotopic mass	calculated from molecular formula	3106.5493	Da	—	NOT TESTED
Identity — observed monoisotopic mass	LC-MS, unit resolution (single quadrupole)	3106.5623	Da	—	NOT TESTED
Mass accuracy	observed vs theoretical	+4.2	ppm	± 15	PASS
Total peptide content	by difference from the gravimetric mass balance	89.76	%w/w	—	NOT TESTED
Target-compound content	total peptide content × purity	89.16	%w/w	—	NOT TESTED
Gross fill (as weighed)	five-place balance, under nitrogen	4.99	mg	5 mg declared	NOT TESTED
Recovered target peptide	gross fill × target content	4.449	mg	5 mg claim	NOT TESTED
Recovery against label claim	recovered ÷ claim	89.0	%	90.0 – 110.0	FAIL
Water content	Karl Fischer, coulometric, duplicate	5.80	%	≤ 10.0	PASS
Counter-ion (acetate)	anion-exchange ion chromatography	3.75	%	≤ 12.0	PASS
Residual solvent + inorganic residue	estimated — see /methods/residual-solvents-q3c/	0.69	%	—	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	6.58	—	2.5 – 8.0	PASS
Retention time (observed)	RP-HPLC, 15 min gradient	6.88	min	6.87 ± 0.30 (normalised)	PASS
Peak asymmetry (10 % height)	Ph. Eur. 2.2.46	1.06	—	0.80 – 1.50	PASS
Plate count, main peak	N = 5.54 (t/w½)²	49,565	—	≥ 20,000	PASS
Resolution to nearest impurity	vs deamidated Asn (+1 Da)	1.34	—	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, 15 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 49,565, and skew follows the reported asymmetry factor of 1.06. 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 0.35 % impurity against a 99.33 % 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	Thymosin α1 — main peak	6.88	4,827,746	99.33	—
2	aspartimide (−18 Da)	7.09	17,011	0.35	-18.011
3	des-acetyl Tα1 (−42 Da)	6.54	9,235	0.19	-42.011
4	truncated (1-24)	6.26	3,402	0.07	-487.229
5	deamidated Asn (+1 Da)	6.71	2,916	0.06	+0.984
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 3106.5493 Da, computed from C129H215N33O55. 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 3106.5623 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 (%)
5+	622.3171	622.3197	0.0026	7.8
4+	777.6446	777.6479	0.0033	56.9
3+	1036.5237	1036.5280	0.0043	100.0
2+	1554.2819	1554.2884	0.0065	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	5.80
Counter-ion (acetate)	ion chromatography	3.75
Residual solvent + inorganic residue	estimated	0.69
Total peptide content	by difference	89.76
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)	99.45	99.33	divergence +0.12 pp vs batch median
Total impurities (% area)	0.55	0.67
Largest single impurity (% area)	not stated	0.35
Water (%)	4.5	5.80
Counter-ion (%)	not stated	3.75
Peptide content (%w/w)	not stated	89.76
Endotoxin (EU/mg)	1.81	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: Supplier-supplied
Evidentiary weight: Weaker evidence. Read with the caveat below.
Chain of custody: Supplier despatch → laboratory direct (courier, cold pack, 11 d) → assay. Submitter did not handle the vial.
Assay date: 29 Aug 2025
Submitted to the index: 08 Sep 2025
Laboratory: Kestrel Bioanalytical, Melbourne, Australia
Method basis: 15 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

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 SGN-2504-P9721 n=1

This is the only report on this lot. One report is not a batch characterisation.

Batch rollup and reproducibility assessment →

Cross-sections

Other recent Thymosin α1 records in the index.
Report	Supplier	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-043213	SGN	SGN-2512-Y1213	Janoshik	2026-Q2	99.13	7.01	—	Buyer-sourced	1	MARGINAL
AX-2026-041468	QYB	QYB-2511-V6148	Kestrel	2026-Q1	99.44	2.86	101.7	Supplier-supplied	2	MARGINAL
AX-2026-041831	FGP	FGP-2511-H2692	PeptideMeter	2026-Q1	99.55	5.09	95.2	Supplier-supplied	0	PASS
AX-2026-041830	FGP	FGP-2511-H2692	PeptideMeter	2026-Q1	98.89	5.04	99.1	Supplier-supplied	0	PASS
AX-2026-041832	FGP	FGP-2511-H2692	Medutest	2026-Q1	98.41	4.46	—	Supplier-supplied	0	PASS
AX-2025-019905	SWB	SWB-2503-S5672	Janoshik	2025-Q3	98.96	3.36	—	Supplier-supplied	0	PASS
AX-2025-020891	CPC	CPC-2504-M1855	Janoshik	2025-Q3	98.14	5.19	104.6	Supplier-supplied	0	PASS
AX-2025-019906	SWB	SWB-2503-S5672	Janoshik	2025-Q3	99.71	3.18	—	Supplier-supplied	0	PASS

Other recent SGN records in the index.
Report	Compound	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-043215	Afamelanotide	SGN-2602-Y9898	PeptideMeter	2026-Q3	98.92	3.40	—	Supplier-supplied	1	MARGINAL
AX-2026-043214	Afamelanotide	SGN-2602-Y9898	Janoshik	2026-Q3	99.19	3.41	106.9	Supplier-supplied	1	MARGINAL
AX-2026-043240	Melanotan II	SGN-2602-L1809	PeptideMeter	2026-Q2	98.65	2.87	—	Supplier-supplied	2	MARGINAL
AX-2026-043255	BPC-157	SGN-2512-H1950	Janoshik	2026-Q2	99.06	4.99	—	Supplier-supplied	2	MARGINAL
AX-2026-043242	Melanotan II	SGN-2602-L1809	VendorInvestigate	2026-Q2	98.14	2.18	107.2	Buyer-sourced	1	FAIL
AX-2026-043221	SLU-PP-332	SGN-2602-X9969	Kestrel	2026-Q2	98.70	5.87	—	Supplier-supplied	0	PASS
AX-2026-043245	Melanotan II	SGN-2602-L1809	Janoshik	2026-Q2	98.54	2.19	100.6	Supplier-supplied	2	MARGINAL
AX-2026-043244	Melanotan II	SGN-2602-L1809	Janoshik	2026-Q2	99.24	2.68	98.0	Supplier-supplied	1	MARGINAL