This result was in agreement with Klomklao,
Benjakul, Visessanguan, Simpson and Kishimura [3] who found
that ATPS comprising PEG1000 (15%, w/w) and MgSO4 (20%, w/
w) provided the best condition for the maximum partitioning of
the protease from tuna spleen into the top phase and gave high
SA and PF.