AssayIndex
Short bioregulator peptides

Vilon

Lys-Glu · KE · C11H21N3O5 · monoisotopic 275.1481 Da. The index holds 17 assay reports on this compound across 4 batches from 4 suppliers.

17 reports4 batchesmedian 99.65 %index spec 99.0 %
Section 1

Analytical fingerprint

Hand-authored chemistry. These properties describe the substance and do not change when a record is added.

A dipeptide, and effectively unretained on C18 at 3.94 min. Reverse-phase purity on vilon measures almost nothing; the index accepts vilon reports only where a HILIC or ion-pair method was used and records C18-only submissions as method-inappropriate. Twelve of the nineteen vilon reports on file fall into that category, which is why the compound's headline median is published with a method caveat rather than a low-n caveat.

Molecular formula
C11H21N3O5
Monoisotopic mass
275.1481Da
Average mass
275.30Da
Residues
2
Nominal retention (RG-2, 30 min)
3.94min
Retention window
0.20min
Counter-ion as usually shipped
acetate
Typical label claims
10 mg · 20 mg
Analytical difficulty (index scale)
0.80 — straightforward
Purity is a defined quantity
YES
Section 2

Representative chromatogram

Drawn from this page's own medians. Not a scan, not an illustration, and not any single report.

06830136602049027319 Vilon3.94 min · 99.65 % 4.04 same trace · ×200 vertical expansion, baseline-corrected · main peak off-scale reporting threshold 0.05 % area 05101520253035 Retention time (min) Response (mAU)
Figure 1. A representative Vilon trace on the index reference method RG-2, constructed from this page's own numbers: the main peak carries the index median purity of 99.65 % area at the nominal retention time of 3.94 min, and each impurity peak carries the median area the index has observed for that named species at its characteristic retention offset. It is not a scan of any single report — every individual record's own chromatogram is on its own page. The lower panel is the same trace at a stated vertical expansion, baseline-corrected, so the impurities are visible; the main peak runs off-scale there by design. Baseline noise is seeded from the compound slug.
Section 3

What the index has observed

Arithmetic over the 17 records the index holds. Aggregates on this page are computed over the records the index holds, which are not a random sample of the material on the market. Lots that get tested are lots someone chose to test. Read every figure here as a description of this dataset rather than as an estimate of a population.

Median purity 99.65% n=17
Interquartile range 0.78pp n=17
Minimum 98.17% n=17
Maximum 99.93% n=17
Pass rate vs spec 82.4% n=17
Median recovery vs claim 96.3% n=9
Median water 7.72% n=17
Median |mass error| 4.3ppm n=17
03692.093.094.095.096.097.098.099.0100.092.00–92.25 %: n=092.25–92.50 %: n=092.50–92.75 %: n=092.75–93.00 %: n=093.00–93.25 %: n=093.25–93.50 %: n=093.50–93.75 %: n=093.75–94.00 %: n=094.00–94.25 %: n=094.25–94.50 %: n=094.50–94.75 %: n=094.75–95.00 %: n=095.00–95.25 %: n=095.25–95.50 %: n=095.50–95.75 %: n=095.75–96.00 %: n=096.00–96.25 %: n=096.25–96.50 %: n=096.50–96.75 %: n=096.75–97.00 %: n=097.00–97.25 %: n=097.25–97.50 %: n=097.50–97.75 %: n=097.75–98.00 %: n=098.00–98.25 %: n=198.25–98.50 %: n=198.50–98.75 %: n=098.75–99.00 %: n=199.00–99.25 %: n=399.25–99.50 %: n=299.50–99.75 %: n=199.75–100.00 %: n=8median 99.65 Purity (% area) Reports
Figure 2. Purity distribution across all 17 Vilon records. Dashed line is this compound's median (99.65 %); the solid vertical is the index acceptance specification for the short bioregulator peptides class (99.0 %). Domain is fixed at 92–100 % on every purity histogram on this site so that compounds can be compared by eye — a wide distribution here is a hard compound, a narrow one is an easy one, and neither is a statement about the suppliers.
Section 4

By supplier

Suppliers with fewer than two purity records on this compound are omitted from the figure rather than drawn as a line. The full table, including the thin cells, is on the by-supplier page.

98.098.498.799.199.499.7100.1ASYASY: Q1 99.91, median 99.93, Q3 99.93, n=8outlier 99.65outlier 99.86n=8GSPGSP: Q1 99.13, median 99.28, Q3 99.47, n=4n=4SSASSA: Q1 99.14, median 99.15, Q3 99.21, n=3n=3SIGSIG: Q1 98.22, median 98.28, Q3 98.33, n=2n=2 Purity (% area)
Figure 3. Vilon purity by supplier, ordered by coverage. The vertical line is the index acceptance specification. Boxes that overlap are suppliers this dataset cannot separate, and most of them overlap.

Full per-supplier table with n= caveats →

Section 5

Characteristic impurities and degradants

The left three columns are authored chemistry — what this molecule characteristically carries and where it elutes. The right three are what the index has actually reported.

Named speciesΔRT (min, RG-2)Δ mass (Da)Seen inMedian % areaMax % area
free glutamic acid (−128 Da)-0.30-128.09594%0.050.82
free lysine (−129 Da)-0.24-129.04382%0.080.52
diketopiperazine (−18 Da)+0.10-18.01182%0.110.48
Lys-Glu-Lys tripeptide (+128 Da)+0.14+128.09559%0.160.74

Degradation pathways

  • diketopiperazine formation
  • hydrolysis to free amino acids

Full impurity profile, with what each named species implies about the synthesis →

Section 7

Quarterly coverage

QuarterReportsMedian purityRange
2024-Q10n<3—
2024-Q20n<3—
2024-Q30n<3—
2024-Q40n<3—
2025-Q1499.2898.88–99.78
2025-Q20n<3—
2025-Q31199.9399.13–99.93
2025-Q42n<398.17–98.38
2026-Q10n<3—
2026-Q20n<3—
2026-Q30n<3—

Quarter-by-quarter detail →

Section 8

Most recent records

The 25 most recent Vilon records of 17.
ReportSupplierLotLabQuarterPurity %Water %Recovery %ProvenanceFlagsResult
AX-2025-021141SIGSIG-2505-6919Nordanalyt2025-Q498.387.50—Buyer-sourced0FAIL
AX-2025-021140SIGSIG-2505-6919VendorInvestigate2025-Q498.177.72—Buyer-sourced0FAIL
AX-2025-020540SSASSA-2508-B6436Janoshik2025-Q399.135.9397.9Buyer-sourced1FAIL
AX-2025-019010ASYASY-{CAT}-1626Medutest2025-Q399.938.5789.9Supplier-supplied1FAIL
AX-2025-019016ASYASY-{CAT}-1626Medutest2025-Q399.938.3799.2Buyer-sourced1FAIL
AX-2025-019012ASYASY-{CAT}-1626Janoshik2025-Q399.938.26—Buyer-sourced0FAIL
AX-2025-020541SSASSA-2508-B6436Kestrel2025-Q399.156.2193.5Buyer-sourced0FAIL
AX-2025-019017ASYASY-{CAT}-1626Janoshik2025-Q399.868.52—Buyer-sourced0FAIL
AX-2025-019013ASYASY-{CAT}-1626Janoshik2025-Q399.938.9296.3Buyer-sourced0FAIL
AX-2025-019015ASYASY-{CAT}-1626Nordanalyt2025-Q399.938.64—Buyer-sourced0FAIL
AX-2025-019014ASYASY-{CAT}-1626VendorInvestigate2025-Q399.658.5692.7Laboratory-retained0FAIL
AX-2025-020539SSASSA-2508-B6436Nordanalyt2025-Q399.265.49—Buyer-sourced0FAIL
AX-2025-019011ASYASY-{CAT}-1626Medutest2025-Q399.938.97—Buyer-sourced1FAIL
AX-2025-019119GSPGSP-2411-J3700Janoshik2025-Q199.366.2489.5Buyer-sourced1FAIL
AX-2025-019121GSPGSP-2411-J3700Medutest2025-Q199.215.52105.6Buyer-sourced0FAIL
AX-2025-019118GSPGSP-2411-J3700Janoshik2025-Q198.885.60—Buyer-sourced0FAIL
AX-2025-019120GSPGSP-2411-J3700Kestrel2025-Q199.785.79101.2Buyer-sourced0FAIL