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A cyclic heptapeptide non-selective melanocortin-receptor agonist (MC1/3/4/5R). Studied for pigmentation pathways and structural pharmacology.
Melanotan II is a synthetic cyclic seven-residue analog of α-MSH that activates MC1R, MC3R, MC4R, and MC5R with broad affinity. The cyclization confers metabolic stability relative to linear α-MSH analogs. It is studied as a tool compound in melanocortin-receptor structure-activity research.
Each vial is lyophilized from acetate buffer, sealed under nitrogen, and shipped cold-chain at −20 °C from our Kelowna facility.
Comparative MC1/3/4/5R agonism assays, melanocyte tyrosinase induction studies, and structural pharmacology of the cyclic melanocortin scaffold.
Sold for laboratory research only. This material is not a drug, food, or cosmetic and is not intended for diagnostic, therapeutic, or recreational use.
| Parameter | Value |
|---|---|
| Sequence | Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-NH₂ |
| Molecular formula | C₅₀H₆₉N₁₅O₉ |
| Molecular weight | 1024.18 g/mol |
| CAS number | 121062-08-6 |
| Length | 7 residues (cyclic) |
| Test | Specification |
|---|---|
| HPLC purity | ≥ 99.0% (lot LM-2650: 99.14%) |
| Mass confirmation | ESI-MS within 0.5 Da |
| Net peptide content | ≥ 80% by AAA |
| Endotoxin | < 0.5 EU/mg (LAL) |
| Bioburden | < 10 CFU/g |
| Residual TFA | < 1.0% |
Manufactured 04 Mar 2026 · Released 11 Mar 2026 · Tested by Lumera QC, Kelowna BC. Retain samples held under storage spec for five years from release date.
| Method | Result |
|---|---|
| RP-HPLC at 220 nm | 99.14% main peak |
| ESI-MS (positive) | 1024.2 Da (theor. 1024.18) |
| Amino acid analysis | 82.1% net peptide |
| LAL endotoxin | < 0.05 EU/mg |
| Karl Fischer (water) | 2.8% w/w |
Allow vial to reach room temperature before opening (≥ 20 minutes). Reconstitute with 1.0–2.5 mL of sterile bacteriostatic water (0.9% benzyl alcohol). Inject solvent slowly down the inner wall of the vial; do not direct stream onto the lyophilized cake.
Swirl gently for 30 seconds. Do not vortex. Allow to dissolve for 5 minutes; clarity should be complete with no visible particulates.
Reconstituted solution is stable for 28 days at 2–8 °C in original vial. For longer storage, aliquot into low-binding tubes and hold at −80 °C; avoid repeated freeze-thaw cycles. Discard if turbidity, color change, or particulate matter is observed.
Hadley ME, Dorr RT. Melanocortin peptide therapeutics. Peptides. 2006;27(4):921–930.
Dorr RT et al. Increased eumelanin expression and tanning is induced by a superpotent melanotropin. Photochem Photobiol. 2004;80(3):572–577.
Cone RD. Studies on the physiological functions of the melanocortin system. Endocr Rev. 2006;27(7):736–749.
Melanotan II reference standard, ≥99% (HPLC), Lumera Labs Inc., Cat. No. LUM-MT2-10, Lot 26-A031.