the handbook of food engineering practice crc press chapter 10 ...
the handbook of food engineering practice crc press chapter 10 ...
the handbook of food engineering practice crc press chapter 10 ...
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Q(A)= k A exp (- E A<br />
RT ) t (49)<br />
and if Y=Q(A)/k A <strong>the</strong>n <strong>the</strong> above equation can be written as<br />
lnY= -1<br />
RT E A + lnt (50)<br />
i.e a plot <strong>of</strong> lnY vs E A <strong>of</strong> different <strong>food</strong> systems gives a straight line. For a particular<br />
variable time-temperature distribution it is proposed that a unique point (T e ,t e ) is defined<br />
from <strong>the</strong> slope and intercept <strong>of</strong> Eq.(50). This would allow calculation <strong>of</strong> <strong>the</strong> quality change<br />
in a <strong>food</strong> system <strong>of</strong> known E A from <strong>the</strong> measured change <strong>of</strong> two (at least) o<strong>the</strong>r <strong>food</strong><br />
systems (or TTI) subjected to <strong>the</strong> same time -temperature conditions. It has been recently<br />
argued that this approach is only valid for iso<strong>the</strong>rmal conditions (Maesmans et al., 1995).<br />
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