Research Article

Digestive Alkaline Proteases from Zosterisessor ophiocephalus, Raja clavata, and Scorpaena scrofa: Characteristics and Application in Chitin Extraction

Table 1

Effects of various metal ions (5 mM) on protease activity.

Metal ionsRelative activity (%)
GobyScorpionfish

Control100100100
Na+10091110
K+1009180
Mg2+117122100
Mn2+47.58337.5
Zn2+2010523
Cu2+17.56747.5
Hg2+366229.5
Fe2+0310
Ca2+110129111
Ba2+11097100