From very dilute alcoholic solutions (and especially with slow cooling) solanine may be obtained in crystals.
Mature healthy potatoes appear to contain no solanine, but from 150 grms.
This peculiar property is one of the most important tests for the presence of solanine.
solanine is soluble in 8000 parts of boiling water, 4000 parts of ether, 500 parts of cold, and 125 of boiling alcohol.
solanine will stand boiling with strongly alkaline solutions without decomposition; but dilute acids, on warming, hydrolyse.
Sodic phosphate gives a crystalline precipitate of solanine phosphate, if added to a solution of solanine sulphate.