Extraction of aromatic amino acids by poly-N-vinylpyrrolidone-3500

The extraction of phenylalanine, tyrosine and tryptophan from aqueous salt solutions by water soluble polymer - poly-N-vinylpyrrolidone having a molecular weight of 3,500 has been studied. Under identical conditions set quantitative characteristics extraction has been established, general scheme of analysis has been developed. Effect the volume ratio of aqueous and organic phases to the recovery of phenylalanine, tryptophan and tyrosine has been studied. The dependence of solution viscosity of the polymer and the speed of lamination systems the molecular weight and concentration of the extractant has been set. It was established that the most studied aromatic amino fully extracted solution of PVP-3500 at a concentration of 0,12 g/cm 3, while the ratio of the equilibrium amounts of aqueous and organic phases 10:4. Optimized conditions for the almost complete extraction of phenylalanine, tyrosine and tryptophan from aqueous salt solutions. The technique of extraction-spectrophotometer determination of aromatic amino acids in aqueous solution. Based highs proposed scheme of interaction with PVP-3500 extractable substances. We have developed a technique characterized by express (analysis time 30 - 40 min), accuracy (relative error within 7%), ecology (and lack of toxic extragants "green extraction"). Learned extraction systems applicable to practically complete extraction of phenylalanine, tyrosine and tryptophan from aqueous solutions.