AX-2026-043194 · L-Carnosine · GL Biochem lot GLBI-2512-S8068

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, 30 min gradient, 214 nm	99.62	% area	≥ 99.0	PASS
Total impurities	RP-HPLC, sum of reported peaks	0.38	% area	≤ 1.0	PASS
Largest single impurity	RP-HPLC — D-carnosine epimer	0.22	% area	≤ 1.00	PASS
Identity — theoretical monoisotopic mass	calculated from molecular formula	226.1066	Da	—	NOT TESTED
Identity — observed monoisotopic mass	LC-MS, high resolution (ESI-TOF/QTOF)	226.1066	Da	—	NOT TESTED
Mass accuracy	observed vs theoretical	-0.1	ppm	± 20	PASS
Total peptide content	by difference from the gravimetric mass balance	91.57	%w/w	—	NOT TESTED
Target-compound content	total peptide content × purity	91.22	%w/w	—	NOT TESTED
Gross fill (as weighed)	five-place balance, under nitrogen	495.54	mg	500 mg declared	NOT TESTED
Recovered target peptide	gross fill × target content	452.032	mg	500 mg claim	NOT TESTED
Recovery against label claim	recovered ÷ claim	90.4	%	90.0 – 110.0	PASS
Water content	Karl Fischer, coulometric, duplicate	8.16	%	≤ 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/	0.27	%	—	NOT TESTED
Endotoxin	kinetic chromogenic LAL	0.28	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	Off-white lyophilised cake, intact	—	white to off-white intact cake	PASS
Reconstitution clarity	reconstituted per submitter procedure	Clear after 90 s gentle swirling, no particulates	—	clear, no visible particulates	PASS
pH (reconstituted, 1 mg/mL)	potentiometric, two-point calibration	7.78	—	2.5 – 8.0	PASS
Retention time (observed)	RP-HPLC, 30 min gradient	3.76	min	3.72 ± 0.20 (normalised)	PASS
Peak asymmetry (10 % height)	Ph. Eur. 2.2.46	1.19	—	0.80 – 1.50	PASS
Plate count, main peak	N = 5.54 (t/w½)²	44,198	—	≥ 20,000	PASS
Resolution to nearest impurity	vs D-carnosine epimer	0.82	—	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 44,198, and skew follows the reported asymmetry factor of 1.19. 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 0.22 % impurity against a 99.62 % 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-Carnosine — main peak	3.76	4,841,841	99.62	—
2	D-carnosine epimer	3.70	10,693	0.22	0.000
3	β-alanine (−137 Da)	3.54	3,402	0.07	-137.059
4	anserine (methylcarnosine, +14 Da)	3.88	2,430	0.05	+14.016
5	free histidine (−71 Da)	3.60	1,944	0.04	-71.037
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 226.1066 Da, computed from C9H14N4O3. 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 226.1066 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+	227.1139	227.1139	0.0000	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.

Component	Determination	%w/w of cake
Water	Karl Fischer	8.16
Counter-ion	none expected	0.00
Residual solvent + inorganic residue	estimated	0.27
Total peptide content	by difference	91.57
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	99.62	divergence -0.15 pp vs batch median
Total impurities (% area)	0.55	0.38
Largest single impurity (% area)	0.29	0.22
Water (%)	7.1	8.16
Counter-ion (%)	not stated	N/A
Peptide content (%w/w)	not stated	91.57
Endotoxin (EU/mg)	0.33	0.28
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 (ambient, 29 d) → laboratory (courier, cold pack, 5 d) → assay.
Assay date: 10 Jun 2026
Submitted to the index: 29 Jun 2026
Laboratory: Janoshik Analytical, Ostrava, Czechia
Method basis: 30 min gradient · high-resolution MS
Verification status: METHOD LIMITED

What this report does not establish

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.

c18_2p629 Jun 2026

Column chemistry flatters or punishes a figure like this. A core-shell column at this gradient resolves the close-eluting family that a fully porous 5 µm bed merges, so 99.62 % here is a harder number than the same figure from a coarser column.

aspartimide29 Jun 2026

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.

median_not_mean29 Jun 2026

One result at the top of the distribution should not move anybody's estimate much on its own. Purity distributions are compressed at the top and long-tailed at the bottom, so the informative observations are the low ones.

Section 7

Related records

Same batch — lot GLBI-2512-S8068 n=9

Report	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-043188	GLBI-2512-S8068	PeptideMeter	2026-Q2	99.62	8.43	—	Buyer-sourced	0	PASS
AX-2026-043189	GLBI-2512-S8068	Medutest	2026-Q2	99.60	8.49	—	Buyer-sourced	0	PASS
AX-2026-043190	GLBI-2512-S8068	Janoshik	2026-Q2	99.46	8.66	—	Buyer-sourced	0	PASS
AX-2026-043191	GLBI-2512-S8068	Janoshik	2026-Q2	99.60	8.38	—	Buyer-sourced	1	MARGINAL
AX-2026-043192	GLBI-2512-S8068	Janoshik	2026-Q2	99.28	8.71	106.8	Buyer-sourced	0	PASS
AX-2026-043193	GLBI-2512-S8068	Medutest	2026-Q2	99.93	8.48	91.9	Buyer-sourced	0	PASS
AX-2026-043195	GLBI-2512-S8068	Janoshik	2026-Q2	99.16	8.69	89.4	Laboratory-retained	1	MARGINAL
AX-2026-043196	GLBI-2512-S8068	Medutest	2026-Q2	99.86	8.60	91.5	Supplier-supplied	0	PASS

Batch rollup and reproducibility assessment →

Cross-sections

Other recent L-Carnosine records in the index.
Report	Supplier	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-043257	CPC	CPC-2603-G9615	VendorInvestigate	2026-Q3	98.20	10.41	102.2	Buyer-sourced	0	FAIL
AX-2026-043256	CPC	CPC-2603-G9615	Janoshik	2026-Q3	99.02	10.17	104.1	Supplier-supplied	0	PASS
AX-2026-043258	CPC	CPC-2603-G9615	Medutest	2026-Q3	98.95	10.15	97.8	Buyer-sourced	0	FAIL
AX-2026-043189	GL Biochem	GLBI-2512-S8068	Medutest	2026-Q2	99.60	8.49	—	Buyer-sourced	0	PASS
AX-2026-043190	GL Biochem	GLBI-2512-S8068	Janoshik	2026-Q2	99.46	8.66	—	Buyer-sourced	0	PASS
AX-2026-043195	GL Biochem	GLBI-2512-S8068	Janoshik	2026-Q2	99.16	8.69	89.4	Laboratory-retained	1	MARGINAL
AX-2026-043188	GL Biochem	GLBI-2512-S8068	PeptideMeter	2026-Q2	99.62	8.43	—	Buyer-sourced	0	PASS
AX-2026-043193	GL Biochem	GLBI-2512-S8068	Medutest	2026-Q2	99.93	8.48	91.9	Buyer-sourced	0	PASS

Other recent GL Biochem records in the index.
Report	Compound	Lot	Lab	Quarter	Purity %	Water %	Recovery %	Provenance	Flags	Result
AX-2026-043179	Kisspeptin-10	GLBI-2608-N7715	Medutest	2026-Q3	98.97	4.37	—	Buyer-sourced	1	MARGINAL
AX-2026-043178	Kisspeptin-10	GLBI-2608-N7715	Janoshik	2026-Q3	98.50	4.55	—	Buyer-sourced	1	MARGINAL
AX-2026-043166	L-Glutathione (reduced)	GLBI-2606-S7352	Janoshik	2026-Q3	99.01	8.84	105.4	Laboratory-retained	1	MARGINAL
AX-2026-043184	Kisspeptin-10	GLBI-2608-N7715	Janoshik	2026-Q3	98.99	3.63	100.6	Supplier-supplied	1	MARGINAL
AX-2026-043185	Kisspeptin-10	GLBI-2608-N7715	Medutest	2026-Q3	98.71	3.71	107.0	Buyer-sourced	1	MARGINAL
AX-2026-043165	L-Glutathione (reduced)	GLBI-2606-S7352	Medutest	2026-Q3	99.47	8.60	—	Supplier-supplied	1	MARGINAL
AX-2026-043182	Kisspeptin-10	GLBI-2608-N7715	Janoshik	2026-Q3	98.93	3.86	95.7	Buyer-sourced	1	MARGINAL
AX-2026-043183	Kisspeptin-10	GLBI-2608-N7715	PeptideMeter	2026-Q3	98.54	4.17	102.2	Buyer-sourced	1	MARGINAL