Fig. 2.

Effects of metal ions on enzyme activity. The purified BL-αGTase activity was measured under standard conditions (pH 6.0 at 40 °C) with amylose and G2 as donor and acceptor in the presence of 5 mM Ca²⁺, Mg²⁺, Cu²⁺, Mn²⁺, Co²⁺, Zn²⁺, Fe²⁺, or EDTA. Bars with different letters are significantly different at p < 0.05 in Duncan’s multiple range test