<i>Musa paradisiaca </i>stem juice as a source of peroxidase and ligninperoxidase

1036-1040Musa paradisiaca stem juice has been shown to contain peroxidase activity of the order of 0.1 enzyme unit /ml. The Kill values of this peroxidase for the substrates guaiacol and hydrogen peroxide are 2.4 and 0.28 mM respectively. The pH and temperature optima arc 4.5 and 62.5°C respectively. Like other peroxidases, it follows double displacement type mechanism. At low pH, Musa paradisiaca stem juice exhibits ligninperoxidase type activity. The pH optimum for ligninperoxidase type activity is 2.0 and the temperature optimum is 24°C. The Km values for veratryl alcohol and n-propanol are 66 and 78 μM respectively