pentagastrin 25 mg in DMSO 5ml
On the PubChem website there are information about solubility of Pentagastrin:
https://pubchem.ncbi.nlm.nih.gov/compound/pentagastrin#section=Solubility
it is soluble in DIMETHYL FORMAMIDE & DIMETHYL SULFOXIDE and it is insoluble in WATER, ETHANOL, ETHER, BENZENE.
There is no specification but I would assume that 25mg in 5ml of DMSO will be easy to achieve.
If 2 mg/ml would be sufficient, it is supposedly soluble at that concentration in water:
http://www.abscience.com.tw/new/prod/1416381934_1.pdf
It is apparently also soluble up to 20 mg/ml in DMF:
http://www.sigmaaldrich.com/Graphics/COfAInfo/SigmaSAPQM/SPEC/B1/B1636/B1636-BULK________SIGMA____.pdf
Apparently for higher concentrations they recomend acetonitrile
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