Abstract: A Bacillus natto culture is treated with chitosan, and then filtered, concentrated, and dried. According to this method, a Bacillus natto culture extract containing nattokinase and 1 ?/g or less of vitamin K2/g dry weight is obtained.
Abstract: A Bacillus natto culture is treated with chitosan, and then filtered, concentrated, and dried. According to this method, a Bacillus natto culture extract containing nattokinase and 1 ?g or less of vitamin K2/g dry weight is obtained.
Abstract: A Bacillus natto culture is treated with chitosan, and then filtered, concentrated, and dried. According to this method, a Bacillus natto culture extract containing nattokinase and 1 &mgr;g or less of vitamin K2/g dry weight is obtained.