Process for liquefying starch

摘要

This invention relates to a process for liquefying starch. More particularly it relates to an appropriate process for liquefying starch by using a thermostable alpha -amylase which has an optimum working pH range in an acidic region and a low calcium requirement. This invention provides a process for liquefying starch by using a calcium-requiring, thermostable alpha -amylase which requires a calcium concentration of 10 mu m or below under a thermostable condition. In the process of the present invention, it is unnecessary to add a calcium salt in liquefying starch and the starch slurry can be reacted while remaining acidic without neutralization, so that the load at the desalting step of the product can be significantly relieved.