Journal of Food Engineering, Vol.116, No.1, 130-137, 2013
Color changes in fish during grilling - Influences of heat transfer and heating medium on browning color
Samples of red sea bream (Pagrus major) were grilled under radiant (far-infrared radiation, FIR) and convective (superheated steam, SHS) heating. The temperature and color (CIE L*, a*, and b* values) of the sample surface were monitored over time, using SHS, dry air, and N-2 as heating media. The rate of L* changes was evaluated by treating the browning reaction as first-order. Color changes based on a* and b* values were effectively correlated with the L* value, using empirical equations. A slower reduction in L* for heating with SHS rather than FIR was obtained, probably because of different activation energies (31.5 and 50.7 kJ mol(-1)) and frequency factors (8.2 and 4759 s(-1)). The order of reductions in L* was dry air > N-2 = SHS. The absence of O-2 in the heating medium could be the reason for the delay in the browning reaction during heating using N-2 and SHS. (C) 2012 Elsevier Ltd. All rights reserved.