ABSTRACT
Subcritical water hydrolysis was carried out to produce valued materials from squid viscera, the waste product of fish processing industries. The reaction temperatures for hydrolysis of raw and deoiled squid viscera were maintained from180 to 280oC for 5 min. The ratio of material to water for hydrolysis was 1:50. Most of the proteins from deoiled squid viscera were recovered at high temperature. The protein yield in raw squid viscera hydrolyzate decreased with the rise of temperature. The reducing sugar yield was higher at high temperature in subcritical water hydrolysis of both raw and deoiled squid viscera. The highest yield of amino acids in raw and deoiled squid viscera hydrolyzates were 233.25±3.25 and 533.78±4.13 mg g-1 at 180 and 280oC, respectively. Most amino acids attained highest yield at the reaction temperature range of 180-220oC and 260-280oC for raw and deoiled samples, respectively. The recovery of amino acids from deoiled squid viscera was about 1.5 times higher than that of raw squid viscera.