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ABSTRACT

Time-temperature indicators from four different manufacturers were evaluated on the basis of their response to constant and variable storage temperature treatments. Several time-temperature indicators of each type were exposed to constant temperatures of -18°C and +5°C, and a variable temperature treatment which could simulate the conditions encountered in a frozen food transport. The discussion presents the time-temperature response of the indicators tested, the average endpoint response recorded, and comments on the characteristic assets and limitation of the indicators investigated.