$5-$ In pilot plant testing of a liquid food subjected to an HTST process, one

microorganism survived the heat treatment. Laboratory tests established that D$121=$

$1\mathrm{.}3$min and $z=10C$ for the microorganism. The maximum initial count of the

microorganism in the food is assumed to be $\frac{{10}^4}{g},$ and the largest container to be used

is $1000g.$ A process is desired that will assure that spoilage occurs in less than one

container per $10,000.$ Temperatures at selected points in the process are as follows:

Calculate the minimum holding time needed to achieve the desired result.