The
solution was filtered and concentrated in
vacuum on a water bath at 60°C. 10 ml of 10%
alcoholic KOH solution was added to it and
after a while, the clear liquid decanted from the
insoluble residue. The alcoholic solution was
left overnight, Yellow needle shaped crystals of
piperine were obtained. The melting point of
the crystals was found to be 124-126°C.