“…These systems have found a wide range of applications in biotechnology [ 27 ], as the extraction, purification, isolation, cleanup, and recovery of various biological compounds, including proteins, can be achieved by ATPS-utilizing approaches based on liquid–liquid phase separation [ 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 ]. The aqueous two-phase extraction utilized in protein separation is based on the fact that various proteins distribute differently between the two phases.…”