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Comes as a, and we've seen it hold up well at -20°C for well over a year—after reconstitution, keep it at 2-8°C and use it within a few weeks. Basically a synthetic vasopressin analog that needs enzymatic conversion to become active, so it's not something you'd use in a direct binding assay without accounting for that lag.
Researchers typically run it in hepatorenal syndrome models or vasoconstrictor studies, though we've had a few buyers try it in portal hypertension work with mixed results. It's better than lysine-vasopressin for reducing visceral blood flow, at least according to what we hear back form repeat customers. Don't expect it to work in simple cell-free systems—it requires biological activation.
sequence is Gly-Gly-Gly-Cys-Tyr-Phe-Gln-Asn-Cys-Pro-Lys-Gly-NH2 with a molecular weight of 1227.39 g/mol (give or take, depending on your batch), and purity is checked by HPLC at ≥99%. It's slightly soluble in water, so we recommend dissolving it in a small volume of acetic acid first if you need a clear solution without particulates hanging around.
Most buyers go with the 10mg vial for initial studies, but we also stock 25mg and 50mg sizes if you're running multiple panels. MOQ is one vial, and COA is included with every order—though if you need additonal stability data or a full SDS, just let us know and we'll dig it up from the batch records.
One concrete thing we've noticed: the lyophilized cake can be fluffy enough to cling to teh vial cap, so tap it down gently before opening or you'll lose a fair amount to static. We usually have stock ready to ship, but for orders over 100mg, confirm lead time—sometimes synthesis cycles take 20 days or so.
