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The partitioning of acid protease produced by submerged fermentation of Penicillium roqueforti in the aqueous two-phase system polyethylene glycol/sodium phosphate was studied. In the system with 15% polyethylene glycol 4000/25% NaH 2 PO 4 favourable partition coefficient and the top phase yield were obtained, 2.651 and 56.51%, respectively. The purification of acid protease from crude enzyme was optimized by optimizing separation factor. Completely randomized factorial design was applied anddoi:10.2298/apt0839171p fatcat:lc3cr5mh2fam7iecqeti5xe2m4