composition was kept constant for all the phase systems (16% PEG/13% salt/71%, w/w water). The results are shown in Table 2.
The invertase specific activity as well as activity recovery in the bottom phase were observed to increase with an increase in molec- ular weight initially till PEG 3350 and to decrease with further increase in molecular weight. However, protein recovery was found to increase gradually with an increase in PEG molecular weight.