How to Reconstitute Melanotan 2: Step-by-Step Laboratory Reconstitution Guide
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How to Reconstitute Melanotan 2: Step-by-Step Laboratory Reconstitution Guide
Melanotan 2 (MT-2, cyclo[Nle4,D-Phe7]-alpha-MSH, MW 1024.18 g/mol, CAS 121062-08-6) is a cyclic heptapeptide melanocortin receptor agonist with broad activity across MC1R, MC3R, MC4R, and MC5R subtypes. It is supplied as a lyophilised white powder in a 10mL sterile glass vial containing 10mg of peptide. MT-2's cyclic structure confers excellent aqueous solubility and stability, making reconstitution straightforward for melanocortin receptor pharmacology and melanogenesis cell model research.
Materials Required
- Melanotan 2 10mg lyophilised vial
- Bacteriostatic water (BAC water) — 10mL vial
- 1mL or 2mL sterile syringe with needle
- Alcohol swabs (70% isopropyl)
- Nitrile gloves
- Permanent marker for labelling
- Refrigerator at 2–8°C for storage
Pre-Reconstitution Preparation
Inspect the MT-2 vial to confirm the lyophilised powder is white and intact with a secure seal. Remove from cold storage and allow to equilibrate to room temperature for 10 minutes. MT-2's cyclic peptide structure and relatively low molecular weight mean it dissolves very quickly — room temperature equilibration prevents condensation issues rather than aiding dissolution.
Step-by-Step Reconstitution Protocol
Step 1 — Prepare workspace. Clean work surface with 70% isopropyl alcohol. Allow to dry. Wear nitrile gloves throughout.
Step 2 — Swab both stoppers. Wipe rubber stoppers on both vials with separate fresh alcohol swabs. Air dry 10 seconds each.
Step 3 — Draw 2mL of BAC water. Draw 2mL of bacteriostatic water into a sterile syringe. For a 10mg vial, 2mL yields a 5mg/mL stock. If a lower stock concentration is preferred, draw up to 4mL for a 2.5mg/mL stock.
Step 4 — Inject slowly along the vial wall. Direct the BAC water slowly down the inner glass wall of the MT-2 vial over 15 seconds. Do not inject directly onto the powder cake.
Step 5 — Dissolve gently. Swirl gently for 20–30 seconds. MT-2 dissolves readily — the solution should be clear and colourless within seconds. Do not shake or vortex.
Step 6 — Inspect and label. Confirm full clarity. Label with reconstitution date, concentration, and initials.
Resulting Concentration
Adding 2mL BAC water to a 10mg MT-2 vial yields a stock concentration of 5mg/mL (5000mcg/mL). For MC1R melanogenesis assays in B16F10 melanoma or primary melanocyte cell models, and MC4R neuronal cell model studies, working concentrations of 0.1nM–1µM are prepared by serial dilution into assay buffer or serum-free media.
Concentration Reference Table
| BAC Water Volume Added | Resulting Concentration |
|---|---|
| 1mL | 10.0mg/mL |
| 2mL | 5.0mg/mL (5000mcg/mL) |
| 4mL | 2.5mg/mL (2500mcg/mL) |
Storage Conditions and Stability
Store lyophilised MT-2 at −20°C prior to reconstitution, protected from light. Once reconstituted, store at 2–8°C in the refrigerator protected from light — MT-2 contains a D-phenylalanine residue that is sensitive to UV exposure. Reconstituted MT-2 in BAC water is stable for up to 28 days under refrigeration. Do not freeze reconstituted solution. Wrap the vial in foil or store in a light-protected container during refrigerated storage. For long-term aliquot storage, prepare single-use aliquots and store at −80°C.
Research Application Notes
MT-2's broad melanocortin receptor subtype activity profile — spanning MC1R, MC3R, MC4R, and MC5R — makes it distinct from the more selective PT-141 (MC3R/MC4R selective) in receptor pharmacology research. MT-2 serves as the pan-melanocortin agonist reference compound against which subtype-selective agents are compared. For melanogenesis research in B16F10 or human melanocyte cell models, MT-2 MC1R activation is characterised via MITF expression, tyrosinase activity, and melanin content assays. For neuronal MC4R studies, include MC4R-selective antagonist HS024 controls to confirm on-target receptor mediation, as MT-2's MC1R and MC5R activity can contribute to composite signalling responses in mixed-receptor-expression cell systems. Melanotan 2 10mg vials are available from Pinnacle Peptides, verified at ≥99% purity by HPLC and mass spectrometry.
All content is intended for in vitro laboratory research purposes only. Not for human or animal consumption. Not intended to diagnose, treat, cure, or prevent any condition.
