In the technology of enzyme immobilization, the choice of carrier material is very important for the catalytic performance of enzyme. As a new type of high efficient enzyme immobilization carrier with larger specific surface area, ordered nano pore structure, good mechanical/electrical/thermal performance, outstanding chemical stability, biocompatibility and controllable surface functional modifications, carbon nanotubes are used more and more extensively. The recent research progress of enzyme immobilization on carbon nanotubes is reviewed in this paper, focusing on the immobilization of hydrolases and oxido-reductases, which have important industrial application value. The influence of surface modification of carrier and immobilizationmethods on the catalytic properties of immobilized enzymes is introduced. The outlook of potential applications of enzyme immobilization on carbon nanotubes is also prospected.

Contents
1 Introduction
2 Research of enzyme immobilization on carbon nanotubes
2.1 Hydrolase immobilization on carbon nanotubes
2.2 Oxido-reductase immobilization on carbon nanotubes
2.3 Other kinds of enzymes immobilization on carbon nanotubes
2.4 The application of immobilized enzymes in the biosensors
3 Conclusions