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If someone's running melanocortin receptor binding assays or studying UV-induced DNA damage repair in melanocytes, they'll reconstitute this lyophilized powder in sterile water at typical concentrations of 1-2 mg/mL and dilute form there.
We've got the CAS 121062-08-6 compound at >99% purity by HPLC—the chromatograms are clean, and we usually include the COA with each shipment (check lead time for custom batch documentation).
Storage is a tight window, 2-8°C in a sealed, dry enviroment, and that's not negotiable; the peptide backbone degrades fast above 8°C, especially as a powder with residual moisture picked up from ambient air.
Actually, the 1024.2 g/mol molecular weight means you'll want to account for peptide content when calculating molarity—some lots come with a slight acetate salt residue that shifts the effective mass by 1-2% or so.
It's better than reagent-grade Melanotan II for competitive binding work because the HPLC consistency holds at 99%+ run to run, but we've seen solubility issues in PBS if the pH drops below 5.5, so pre-warm reconstitution buffer to room temp.
Most buyers get the 50 mg vial format for small-scale studies, but samples are availble if you're just testing dissolution or end-capping stability, and we ship samples within 5 business days when in stock.
