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The 99% purity is what we needed for those receptor-binding assays where even trace impurities can throw off the IC50 curves, and this CAS 2023788-19-2 batch came in at 99.2% on the latest COA we received from teh supplier.
Basically, we've been struggling with inconsistent results form the semaglutide batches we were sourcing locally, so switching to this tirzepatide powder as a comparator compound should give us a tighter tolerance than most of what's avaliable through the UK distributors we were dealing with (usually 2-4 weeks lead time anyway).
Most buyers in our network go with the 10mg vials for reconstitution work, but I went with a mix of 5mg and 30mg vials since we'll be running both low-dose and high-dose dose-response studies in parallel.
It's a lyophilized powder, so we'll need to be careful with reconstitution protocols — the storage conditions are pretty standard: keep it dry and dark at 0-4°C for short-term use, or -20°C if you're sitting on it for months, with a shelf life of over 2 years if stored properly.
One thing that caught me off guard with the last peptide shipment was the vial variance — some vials had more residual moisture than others — but the COA on this one shows consistent weights across the batch, which is a detail I didn't think to ask about last time.
We had to confirm the MOQ was 10 boxes, but the supplier actually had stock in their UK warehouse, so we're looking at a 5-7 day delivery rather than usual 20 days or so.
