Extraction and preconcentration of anthocyan dye from aqueous solutions with water-soluble poly-N-vinylamides

Extraction of an anthocyan dye with poly- N -vinylpyrrolidone (PVP) and poly- N -vinylcaprolactam (PVC) under the conditions of separation of aqueous solutions of this polymer into two phases in the presence of salting-out agents (sodium chloride and sodium or ammonium sulfate) was studied.