2.2. Cooling curves
Cooling curves were obtained using two household refrigerators:(1) a domestic refrigerator (DC49A, Eletrolux, Curitiba,Brazil) with a freezing compartment, static cooling and no ‘‘quickfreeze’’ function, which was named ‘‘Freezer A’’ and (2) a second freezer (FFE24, Electrolux, Curitiba, Brazil) with a ‘‘quick freeze’’compartment equipped with a forced-air cooling system denoted as ‘‘Freezer B’’. When the quick freeze function was enabled, thefreezer worked with no interruption and the temperature dropped quickly to lower temperatures than conventional freezers. Freezer A had a total volume of 115 L and a freezing capacity