This is similar to observations by Benjakul et al. (2008) who demonstrated that L, a and b values of black tiger shrimp (Penaeus monodon) and white shrimp (Penaeus vannamei) steam-cooked at 100 °C increased when heating time increased up to 1 min. The colour change from orange to red in the cooked shrimp is explained by the
release of individual astaxanthin fromthe carotenoproteinswhen denatured
by heat