Konjac glucomannan as a carrier material for time--temperature integrator.

ABSTRACT

Hardness, springiness and water retention of konjac glucomannan gel (g-KGM) as a novel carrier material for time-temperature integrator (TTI) in aseptic processing were determined and compared with those of sodium alginate gel (g-SA). Hardness of both g-KGM and g-SA increased with temperature values of g-SA were significantly higher (p < 0.05) than those of g-KGM at all temperatures. No significant difference in springiness between g-KGM and g-SA from 40 °C to 90 °C and significant differences (p < 0.05) between 100 °C and 140 °C were found. Water retention property of g-KGM was lower than that of g-SA between 60 °C and 100 °C, but much higher between 100 °C and 140 °C. Heat transfer tests performed on g-KGM alone as well as on g-KGM as a carrier, embedded with TTI, α-amylase as an integrator, indicated that g-KGM was suitable for industrial ultrahigh temperature sterilization test.