How to dissolve casein?Thank you

I used it when I was a graduate student. I remember that the approach at that time was to add a few drops of methamphetamine at that time, which seemed to make of casein into pieces, and then added the buffer to heat it slowly to dissolve it!

I didn't dissolve 5%at the beginning, and finally gave up

The same eighth floor, slightly heated+stir.

Dissolt with 0.5m sodium hydroxide

Will the concentration you dissolve too high, exceeding the solubility.The commercialized cases that have been used are dissolved with PBS, 1%(w/v) of the concentration