AX-2026-041231

L-Glutathione (reduced) · 200 mg declared · Wuhan Wansheng Biotechnology Co., Ltd. · lot WWB-2602-U1840

PASSMETHOD LIMITED

Report ID: AX-2026-041231
Compound: L-Glutathione (reduced)
Compound class: Short bioregulator peptides
Supplier: WWB — Wuhan Wansheng Biotechnology Co., Ltd.
Batch / lot: WWB-2602-U1840
Declared label claim: 200mg
Laboratory: PeptideMeter
Assay date: 12 Feb 2026
Submitted: 24 Feb 2026
Quarter: 2026-Q1
Submitter: ha.frisk
Sample provenance: Supplier-supplied

Section 1

Results

Measured against the index acceptance specification for the short bioregulator 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, 28 min gradient, 214 nm	99.28	% area	≥ 98.5	PASS
Total impurities	RP-HPLC, sum of reported peaks	0.72	% area	≤ 1.5	PASS
Largest single impurity	RP-HPLC — glutathione disulfide (GSSG, +305 Da)	0.49	% area	≤ 1.00	PASS
Identity — theoretical monoisotopic mass	calculated from molecular formula	307.0838	Da	—	NOT TESTED
Identity — observed monoisotopic mass	LC-MS, high resolution (ESI-TOF/QTOF)	307.0834	Da	—	NOT TESTED
Mass accuracy	observed vs theoretical	-1.3	ppm	± 20	PASS
Peptide content	not ordered on this submission	not determined	—	required to check label claim	NOT TESTED
Water content	Karl Fischer, coulometric, duplicate	9.31	%	≤ 12.0	PASS
Counter-ion	no ionisable counter-ion expected	N/A	—	not applicable	NOT TESTED
Residual solvent + inorganic residue	estimated — see /methods/residual-solvents-q3c/	0.57	%	—	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, colourless, no visible particulates	—	clear, no visible particulates	PASS
pH (reconstituted, 1 mg/mL)	potentiometric, two-point calibration	6.00	—	2.5 – 8.0	PASS
Retention time (observed)	RP-HPLC, 28 min gradient	3.88	min	4.02 ± 0.20 (normalised)	PASS
Peak asymmetry (10 % height)	Ph. Eur. 2.2.46	1.45	—	0.80 – 1.50	PASS
Plate count, main peak	N = 5.54 (t/w½)²	68,797	—	≥ 20,000	PASS
Resolution to nearest impurity	vs S-sulfonate adduct (+80 Da)	2.15	—	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, 28 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 68,797, and skew follows the reported asymmetry factor of 1.45. 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 0.49 % impurity against a 99.28 % 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	L-Glutathione (reduced) — main peak	3.88	4,825,316	99.28	—
2	glutathione disulfide (GSSG, +305 Da)	4.37	23,816	0.49	+304.984
3	S-sulfonate adduct (+80 Da)	3.75	6,318	0.13	+79.957
4	γ-Glu-Cys (−57 Da)	3.71	3,402	0.07	-57.021
5	cysteinyl-glycine (−129 Da)	3.66	1,458	0.03	-129.043
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 307.0838 Da, computed from C10H17N3O6S. 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 307.0834 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 (%)
1+	308.0911	308.0907	-0.0004	100.0

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.

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)	99.90	99.28	divergence +0.62 pp vs batch median
Total impurities (% area)	not stated	0.72
Largest single impurity (% area)	not stated	0.49
Water (%)	8.8	9.31
Counter-ion (%)	not stated	N/A
Peptide content (%w/w)	86.4	not determined
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: Supplier-supplied
Evidentiary weight: Weaker evidence. Read with the caveat below.
Chain of custody: Supplier despatch → laboratory direct (courier, cold pack, 3 d) → assay. Submitter did not handle the vial.
Assay date: 12 Feb 2026
Submitted to the index: 24 Feb 2026
Laboratory: PeptideMeter, Tallinn, Estonia
Method basis: 28 min gradient · high-resolution MS
Verification status: METHOD LIMITED

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 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 WWB-2602-U1840 n=5

Report	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Result
AX-2026-041229	WWB-2602-U1840	Medutest	2026-Q1	99.72	9.55	—	Supplier-supplied	PASS
AX-2026-041230	WWB-2602-U1840	PeptideMeter	2026-Q1	98.71	9.22	94.2	Laboratory-retained	PASS
AX-2026-041232	WWB-2602-U1840	Medutest	2026-Q1	99.24	9.72	94.4	Supplier-supplied	PASS
AX-2026-041233	WWB-2602-U1840	Janoshik	2026-Q1	99.93	9.13	—	Supplier-supplied	PASS

Batch rollup and reproducibility assessment →

Cross-sections

All L-Glutathione (reduced) records n=122
All WWB records n=522
All PeptideMeter records n=1107
All 2026-Q1 records n=832
L-Glutathione (reduced) by supplier
L-Glutathione (reduced) impurity profile

Other recent L-Glutathione (reduced) records in the index.
Report	Supplier	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-043166	GL Biochem	GLBI-2606-S7722	PeptideMeter	2026-Q3	99.26	8.52	107.1	Supplier-supplied	1	MARGINAL
AX-2026-043461	WXT	WXT-2605-B5313	PeptideMeter	2026-Q3	97.39	6.92	102.2	Supplier-supplied	0	FAIL
AX-2026-042932	MKM	MKM-2511-F2902	Janoshik	2026-Q2	98.57	8.41	92.9	Supplier-supplied	1	MARGINAL
AX-2026-043399	WXT	WXT-2512-P4300	PeptideMeter	2026-Q2	98.07	8.72	—	Supplier-supplied	1	FAIL
AX-2026-042337	HJ	HJ-2511-F3082	Janoshik	2026-Q2	99.93	7.58	—	Supplier-supplied	0	PASS
AX-2026-042930	MKM	MKM-2511-F2902	Janoshik	2026-Q2	98.42	7.82	97.4	Supplier-supplied	1	FAIL
AX-2026-042336	HJ	HJ-2511-F3082	Janoshik	2026-Q2	99.93	7.34	—	Supplier-supplied	0	PASS
AX-2026-042338	HJ	HJ-2511-F3082	Kestrel	2026-Q2	99.93	6.73	—	Supplier-supplied	0	PASS

Other recent WWB records in the index.
Report	Compound	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-041275	Liraglutide	WWB-2607-X2189	Nordanalyt	2026-Q3	99.61	5.03	97.3	Supplier-supplied	0	PASS
AX-2026-041387	BPC-157	WWB-2606-H3906	Janoshik	2026-Q3	98.95	4.64	—	Laboratory-retained	1	MARGINAL
AX-2026-041334	Semaglutide	WWB-2606-N3192	Janoshik	2026-Q3	98.83	5.04	—	Supplier-supplied	1	MARGINAL
AX-2026-041337	Semaglutide	WWB-2606-N3192	Nordanalyt	2026-Q3	98.96	4.81	—	Supplier-supplied	1	MARGINAL
AX-2026-041385	BPC-157	WWB-2606-H3906	Medutest	2026-Q3	99.31	4.31	—	Supplier-supplied	1	MARGINAL
AX-2026-041390	BPC-157	WWB-2606-H3906	Medutest	2026-Q3	99.47	4.84	99.3	Supplier-supplied	1	MARGINAL
AX-2026-041386	BPC-157	WWB-2606-H3906	VendorInvestigate	2026-Q3	99.32	4.88	99.2	Buyer-sourced	1	MARGINAL
AX-2026-041335	Semaglutide	WWB-2606-N3192	Janoshik	2026-Q3	99.55	4.55	100.5	Supplier-supplied	1	MARGINAL