AX-2025-018801

TB-500 · 5 mg declared · Flourishglobal Peptide Biotech (Chengdu) Co., Ltd. · lot FGP-2508-S8145

MARGINALPURITY ONLY

Report ID: AX-2025-018801
Compound: TB-500
Compound class: Tissue-repair and immunomodulatory peptides
Supplier: FGP — Flourishglobal Peptide Biotech (Chengdu) Co., Ltd.
Batch / lot: FGP-2508-S8145
Declared label claim: 5mg
Laboratory: Janoshik Analytical
Assay date: 13 Oct 2025
Submitted: 25 Oct 2025
Quarter: 2025-Q4
Submitter: m.hovland
Sample provenance: Buyer-sourced

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, 30 min gradient, 214 nm	99.85	% area	≥ 98.5	PASS
Total impurities	RP-HPLC, sum of reported peaks	0.15	% area	≤ 1.5	PASS
Largest single impurity	RP-HPLC — des-acetyl TB-500 (−42 Da)	0.06	% 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	91.91	%w/w	—	NOT TESTED
Target-compound content	total peptide content × purity	91.77	%w/w	—	NOT TESTED
Gross fill (as weighed)	five-place balance, under nitrogen	4.83	mg	5 mg declared	NOT TESTED
Recovered target peptide	gross fill × target content	4.432	mg	5 mg claim	NOT TESTED
Recovery against label claim	recovered ÷ claim	88.6	%	90.0 – 110.0	FAIL
Water content	Karl Fischer, coulometric, duplicate	3.17	%	≤ 10.0	PASS
Counter-ion (acetate)	anion-exchange ion chromatography	4.34	%	≤ 12.0	PASS
Residual solvent + inorganic residue	estimated — see /methods/residual-solvents-q3c/	0.58	%	—	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 powder, no defined cake (melt-back)	—	white to off-white intact cake	FAIL
Reconstitution clarity	reconstituted per submitter procedure	Clear with a single visible fibre	—	clear, no visible particulates	FAIL
pH (reconstituted, 1 mg/mL)	potentiometric, two-point calibration	5.17	—	2.5 – 8.0	PASS
Retention time (observed)	RP-HPLC, 30 min gradient	7.81	min	7.86 ± 0.25 (normalised)	PASS
Peak asymmetry (10 % height)	Ph. Eur. 2.2.46	1.05	—	0.80 – 1.50	PASS
Plate count, main peak	N = 5.54 (t/w½)²	47,574	—	≥ 20,000	PASS
Resolution to nearest impurity	vs [D-Thr]-diastereomer	0.75	—	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 47,574, and skew follows the reported asymmetry factor of 1.05. 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 0.06 % impurity against a 99.85 % 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	TB-500 — main peak	7.81	4,853,020	99.85	—
2	des-acetyl TB-500 (−42 Da)	7.29	2,916	0.06	-42.011
3	[D-Thr]-diastereomer	7.70	2,430	0.05	0.000
4	des-Gln truncate (−128 Da)	7.57	1,944	0.04	-128.059
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	3.17
Counter-ion (acetate)	ion chromatography	4.34
Residual solvent + inorganic residue	estimated	0.58
Total peptide content	by difference	91.91
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)	99.79	99.85	divergence -0.06 pp vs batch median
Total impurities (% area)	0.21	0.15
Largest single impurity (% area)	not stated	0.06
Water (%)	3.0	3.17
Counter-ion (%)	5.0	4.34
Peptide content (%w/w)	91.4	91.91
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, 19 d) → laboratory (courier, dry ice, 2 d) → assay.
Assay date: 13 Oct 2025
Submitted to the index: 25 Oct 2025
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.

aspartimide25 Oct 2025

Aspartimide formation at an Asp-Gly or Asp-Ser motif shows up as a pair of late-eluting satellites. They are not present above the reporting threshold on this trace.

scale_up_delta25 Oct 2025

Purity usually falls between gram and kilogram scale. A figure of 99.85 % on a commercial lot rather than a laboratory batch is the more informative version of this result.

valley_drop25 Oct 2025

Valley height relative to the smaller peak is the practical criterion an operator uses, and it is not on the report. Resolution is a proxy for it and an imperfect one on asymmetric pairs.

Section 7

Related records

Same batch — lot FGP-2508-S8145 n=3

Report	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2025-018802	FGP-2508-S8145	VendorInvestigate	2025-Q4	99.93	4.11	98.1	Buyer-sourced	0	PASS
AX-2025-018803	FGP-2508-S8145	Nordanalyt	2025-Q4	99.43	3.49	97.4	Buyer-sourced	0	PASS

Batch rollup and reproducibility assessment →

Cross-sections

Other recent TB-500 records in the index.
Report	Supplier	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-041776	ASY	ASY-{CAT}-2167	Janoshik	2026-Q3	99.92	4.61	98.2	Buyer-sourced	0	PASS
AX-2026-041777	ASY	ASY-{CAT}-2167	PeptideMeter	2026-Q3	99.78	4.09	92.8	Buyer-sourced	0	PASS
AX-2026-041782	ASY	ASY-{CAT}-2167	Nordanalyt	2026-Q3	99.93	3.94	—	Buyer-sourced	0	PASS
AX-2026-041774	ASY	ASY-{CAT}-2167	PeptideMeter	2026-Q3	99.93	4.41	96.2	Buyer-sourced	0	PASS
AX-2026-042127	JEEP	JEEP-2602-V8614	Medutest	2026-Q3	99.68	3.55	—	Buyer-sourced	1	FAIL
AX-2026-042021	AMB	AMB-2602-P5987	VendorInvestigate	2026-Q3	99.86	4.79	101.4	Buyer-sourced	0	PASS
AX-2026-041780	ASY	ASY-{CAT}-2167	Janoshik	2026-Q3	99.93	3.48	102.5	Buyer-sourced	1	FAIL
AX-2026-041779	ASY	ASY-{CAT}-2167	Janoshik	2026-Q3	99.84	3.85	—	Buyer-sourced	1	FAIL

Other recent FGP records in the index.
Report	Compound	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Result
AX-2026-041643	Semaglutide	FGP-2602-M8547	Janoshik	2026-Q3	99.31	2.79	100.7	Buyer-sourced	PASS
AX-2026-041638	Semaglutide	FGP-2602-M8547	Janoshik	2026-Q3	99.40	2.75	105.8	Buyer-sourced	PASS
AX-2026-041641	Semaglutide	FGP-2602-M8547	PeptideMeter	2026-Q3	98.98	2.38	105.0	Buyer-sourced	PASS
AX-2026-041610	Tirzepatide	FGP-2603-L7753	Janoshik	2026-Q3	98.81	2.45	101.0	Buyer-sourced	PASS
AX-2026-041637	Semaglutide	FGP-2602-M8547	PeptideMeter	2026-Q3	99.40	2.83	—	Laboratory-retained	PASS
AX-2026-041642	Semaglutide	FGP-2602-M8547	PeptideMeter	2026-Q3	98.78	2.24	—	Buyer-sourced	PASS
AX-2026-041609	Tirzepatide	FGP-2603-L7753	Janoshik	2026-Q3	98.52	2.00	98.0	Buyer-sourced	PASS
AX-2026-041636	Semaglutide	FGP-2602-M8547	Nordanalyt	2026-Q3	99.39	2.17	—	Buyer-sourced	PASS