| 摘要 |
PROBLEM TO BE SOLVED: To obtain Natto (fermented soybeans) having a slight Natto smell and a high thrombolytic enzyme activity, capable of practically retaining the activity even during the period of minimum durability and having a high production amount of a mucilaginous substance, Umami and strong stringing, a Natto strain capable of producing the Natto and to provide a method for producing the Natto. SOLUTION: This method for obtaining a Natto strain KA-145 comprises steps of suspending Natto prepared by using rice straws present in the natural world in a physiological saline, preparing a suitably diluted liquid, smearing a barbital-agarose-fibrin gel plate culture medium with the diluted liquid, primarily screening a colony greatly dissolving the fibrin gel in the colony peripheral part and forming a transparent region from colonies grown in the plate as a strain capable of highly producing thrombolytic enzyme and then smearing a culture medium for producing the mucilaginous substance with the selected strain and secondarily screening a strain producing a large amount of the mucilaginous substance as a strain capable of highly producing thrombolytic enzyme and mucilaginous substance from colonies formed on the plate. The Natto is produced with the resultant Natto strain KA-145 obtained from the steps. |
