VARIATION OF QUALITY ATTRIBUTES IN SERIALLY CONNECTED INDEPENDENT FOOD REACTOR UNITS .2.

The first part of the present publication treats first-order quality a ttribute variations in a flow-through type food reactor assembled of s erially connected units. Approximative formulae have been created for decreasing time-dependent attribute changes to calculate the average o utlet attribute intensity, introducing relations between the relative exit attribute intensity and the rate constant. An example is given to help better understanding. The second part analyzes how the concept o f equivalent heat treatment time, widely used in the sterilization and pasteurization processes of packed food, can be interpreted in the ca se of flow-through type treatments. It has been concluded that the 'pl ug-flow time equivalent' always has an additive nature (irrespective o f the reaction order of the empirical kinetics). The average equivalen t exhibits this additive nature only in case of zero- and first-order variations. This part of the publication is also supplemented by an ex ample.