Question

Heat resistance of microorganisms and their spores can be expressed in terms of _______

(a) F0 value

(b) thermal death time

(c) D value

(d) thermal death point

I got this question in class test.

My doubt stems from Heat Transfer Applications topic in chapter Heat Transfer Applications of Food Processing Unit Operations

Answer 1

Right option is (b) thermal death time

For explanation I would say: Heat resistance of microorganisms and their spores can be expressed in terms of thermal death time. Microorganisms are more heat resistant than their spores. Heat resistance of ascospores is 60°C for 10-15 min and the heat resistant of vegetative yeast is 50-58°C in 10-15 min.