Here given decimal reduction time D at 121 oC(D121) and the value z for a thermophilic spore =30 s and 10.5oC.
we know that
"log(\\frac{D_1}{D_2})=\\frac{T_1 -T_2}{z}"
"log(\\frac{30}{D})=\\frac{121 -150}{10.5}"
"\\frac{ 30}{D}=" antilog(-2.7619)
D=0.00087 min
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