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They’re running a dose-response assay, diluting this into saline for subcutaneous injection in rodent models, and they need to know the peptide’s integrity holds at 1 mg/mL without aggregation—that’s where our retest policy kicks in if storage temps waver during transit.
We run HPLC with UV detection at 214 nm and 280 nm, plus a separate mass spec check; purity hits 99% (give or take 0.3%) pretty much every time, and we reject anything below that threshold before it even gets to packaging.
comes in 10, each sealed under argon—it’s stable for 24 months at 2-8°C as long as you keep it light-protected, but if you’ve got a batch sitting at room temp for a week, we’ll replace it under our retest policy (usually 30 days form delivrey).
Most buyers don’t think to ask, but we include a COA with each order that lists retention time and peak area ratio, not just a single number; for GLP work, you’ll want to confirm batch consistency across multiple vials from teh same lot.
Also, the 4113.58 g/mol molecular weight matches theoretical within 0.5 Da by LC-MS, so you’re not dealing with truncated fragments that could skew receptor binding data—something we check because of that it’s a known issue with cheaper suppilers.
It’s not formulated for oral gavage studies without a vehicle, and we don’t recommend it for cell-free assays above 10 µM due to poor solubility in plain PBS—stick with DMSO stock solutions and dilute from there.
