2.2. Preparation of S9 rat liver fraction
Freshly excised livers from three adult Wistar rats were freed
from fat and connective tissue and immersed in ice-cold PBS. The inner
tissue was weighed, placed in a small beaker, minced and
homogenized in PBS (ratio 1:3, w/v) kept on ice during the procedure.
The homogenates were obtained using a Potter–Elvehjem
homogenizer and centrifuged at 9000g for 20 min at 4 C in an
Eppendorf 5810R centrifuge equipped with a F45-30-11 Rotor. The
obtained supernatants (fraction S9) were immediately aliquoted
and stored frozen at 80 C until used.