assayhead

I have found that adding the bacteriostatic water in two stages sometimes helps. Add half, swirl, then add the rest. It is not always faster but it feels more controlled.

titrationclub

Sometimes it is just the specific peptide. Some are naturally less soluble. Have you checked the solubility data for your specific compound?

ligandden

This is a great point. Not all peptides are created equal in terms of their solubility characteristics. A quick literature search might offer some insights.

clinicalwolf

I always use a fresh syringe for each reconstitution. And I make sure to let the bacteriostatic water run down the side of the vial slowly. It seems to help prevent foaming.

kineticx

Totally feel you on this. Some batches just seem more finicky than others. I have had vials that dissolve instantly and others that take what feels like an hour of gentle swirling.

protocol88

My biggest frustration is when a vial is underfilled. It makes calculating the precise concentration a nightmare for my research. Quality control needs to be better.

echo88

I actually prefer to use slightly chilled bacteriostatic water. I find it helps with stability if I am not using it all immediately. But I agree gentle swirling is paramount.

protocol21

The particulate matter is the worst. I usually just let it settle and then carefully draw from the top. But it always makes me wonder about the true concentration.

cold2184

Gentle swirling is key. No aggressive shaking. Also make sure your bacteriostatic water is at room temperature. Cold water can sometimes make things dissolve slower.