[Researches on the utilisation of the pigment from Phytolacca decandra L. as a food colorant, Pt.1: Preparation of an extract free from toxic substances]

colorant alimentaire colorantes alimentarios coloranti alimentari estrazione extraction food colorants pigment pigmenti pigmentos pigments purification purificazione residues residui residuos saponinas saponine saponins sostanze tossiche substance toxique toxic substances