Native Polyacrylamide Gel Electrophoresis In gel detection of peroxidase was performed using polyacrylamide gel (4.0% for stacking gel and 7.5% for resolving gel). Electrophoresis was carried out using a mini-VE vertical slab-gel unit (Amersham Bioscience, USA) with constant current of 40 mA. The native gel was incubated with 160 mM guaiacol and 160 mM hydrogen peroxide in 10 mM phosphate buffer, pH 6.0 at 25°C until the orange band of tetraguiacol appeared locating protein with peroxidase-like activity (30 min). This protocol was modified from that described by Johri et al. [19]. The gel was rinsed with distilled water for 30 min and photographed, followed by placing the gel in the protein staining solution (0.025% Coomassie Brilliant Blue R-250, 40% methanol and 7% acetic acid) overnight. Destaining protocol was carried out until the background of the gel was clear and ready to be photographed.