In addition, the current cost of the enzymes is not a major proportion of the total production cost (around 5%) when producing ethanol from starch or corn, and the cost of converting CP to ethanol will not be much higher since there is only one additional enzyme, and the enzyme costs for the second generation of bioethanol have been greatly reduced. In addition, the future potential use of immobilized enzymes would allow a certain degree of enzyme recycling and so further reduce these costs.