A waterborne multicolor paint is prepared by chitosan in acetic acid solution, mixing with short fiber and crosslinked by glutaric dialdehyde.

For the fabrication of HRP electrode, cysteamine was first self-assembled onto the surface of the gold electrode, and then HRP was immobilized onto the electrode through glutaraldehyde.

The optimum conditions of preparation for immobilized were studied and the results were compared with that of valeric dialdehyde crosslink and calcium alginate embedment methods.