piperine colours the sulphuric acid blood-red, and is turned dark-brown, almost black by the cerium oxide (Sonnenschein).
piperine, the alkaloid of pepper, has also been well studied.
It also contains a mere trace of piperina or piperine, one of the most valuable constituents of black pepper.
He has proved that the alkaloid so obtained is identical with that prepared from piperine.
Pepper owes its properties to an alkaloid, piperine, and to a volatile oil.