Process for liquefying starch
AssigneeHitachi, Ltd.
InventorsRyooichi Haga, Masahiko Ishida, Masako Katsurayama
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Abstract
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.
Claims6
A process for liquefying starch which comprises contacting .alpha.-amylase obtained by culturing of Clostridium sp. RS-0001, FERM P-7918, with an aqueous slurry or solution of the starch at an elevated temperature at a pH value of 5.5 or lower and at a calcium ion concentration of 100 .mu.M or lower.
Dependencies are inferred from the claim text.