This product is not tested for solubility. However, various sources state this chemical is soluble in water at < 0.1 mg/mL, DMSO at approximately 100 mg/mL, Ethanol at approximately 100 mg/mL, Dimethylformamide at approximately 100 mg/mL, and 0.15 M Tris-HCl (pH 8.5) at 1 mg/mL. The stability in the solution has not been determined.
Phytanic acid is a mixture of isomers supplied as a neat liquid. The minimum purity specification is 96%. The molecular weight of this material is 312.53. The density has not been established but its estimated range is 0.80 to 0.90 g/mL.
Assuming a purity of 96% and a density of 0.85 g/mL, the concentration would be 2.6 M. Diluting this material to 5 µM, and 50 µM will depend on the volume needed. Please utilize this calculator below for dilution instructions:
https://www.sigmaaldrich.com/support/calculators-and-apps/solution-dilution-calculator