The timeetemperature profiles of peanut butter during microwave
heating at 3 power levels (2, 4, and 6 kW) are shown in Fig. 1.
After 5 min of microwave heating, the center temperatures of
peanut butter increased to 22, 49, and 101 C at 2, 4, and 6 kW,
respectively. Two kW of microwave heating did not generate heat
in peanut butter; however, 6 kW increased the temperature of
peanut butter to nearly 100 C. Differences in microwave power
greatly affected temperature increase in peanut butter.