The activity of immobilized GI was 450 U/g (wet). Km and Vmax values of immobilized GI were
1.16 mol/L and 1.07 × 10−3 mol/L min, respectively. Immobilized GI onto GAMM support has better operational stability, thermal stability and storage stability, in which it retained 91% ofits initial activity after
recycled for 18 times and retained 97% of its initial activity after stored at 4 ◦C for six weeks. Therefore
immobilized GI onto GAMM support was an excellent catalyst for isomerization of glucose to fructose.