Thermal-stability profile In the study of temperature stability, partially purified peroxidase in 10 mM phosphate buffer, pH 6 was maintained at different temperatures up to 5 h (see Fig. 8). The incubated enzymes were then assayed for peroxidase activity every hour. It was demonstrated that, peroxidase maintained its activity in the temperature range of 30 to 40 °C; where at 5 h the relative activity was at 60%. Activity of peroxidase pre-incubated at 50.0˚C and 60 °C decreased from 100% to 47% and 34% at 3 h, but continued to maintain at above 37% and 18% at 5 h, respectively. Moreover, enzymatic activity decreased rapidly for those pre-incubated at 70, 80 and 90 °C within the first hour and approached inactivity after 2 h. Our results showed that fingerroot peroxidase was stable at temperatures between 30 to 40 °C for 5 h and at 50 to 60 °C for 1 h which similar to peroxidase from leaves of