Abstract
A strain of Streptococcus bovis isolated from bovine rumen has a strong fermentability of raw starch and produces a single extra-cellular α-amylase, and the activity of this amylase on raw starch is remarkable when compared with ordinary bacterial amylase. Authors have studied the crystallization and some characteristics of this amylase. It was known that this amylase came under the category of bacterial saccharif ying α-amylase from the mutarotation of reducing sugar produced and the mode of action on soluble starch. This crystallized amylase was adsorbed on raw starch completely, and showed acceleration of the starch digestion under the presence of Ca2+. Especially, various raw grain starches were dissolve completely producing chiefly glucose and maltose. The remarkable activity for raw starch suggests that this amylase should be specially called as “raw starch hydrolase.”
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