High Quality Content by WIKIPEDIA articles Piperine is the alkaloid
responsible for the pungency of black pepper and long pepper, along
with chavicine (an isomer of piperine). It has also been used in
some forms of traditional medicine and as an insecticide. Piperine
forms monoclinic needles, is slightly soluble in water and more so
in alcohol, ether or chloroform: the solution in alcohol has a
pepper-like taste. It yields salts only with strong acids. The
platinichloride B4 H2PtCl6 forms orange-red needles. ("B" denotes
one mole of the alkaloid base in this and the following formulae.)
Iodine in potassium iodide added to an alcoholic solution of the
base in presence of a little hydrochloric acid gives a
characteristic periodide, B2 HI I2, crystallising in steel-blue
needles, mp. 145 C. Anderson first hydrolysed piperine by alkalis
into a base and an acid, which were later namedpiperidine and
piperic acid respectively. The alkaloid was synthesised by the
action of piperoyl chloride on piperidine.
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