Abstract: A Koji production system including a culture area, an environment control device, a Koji container, a carrying-in lane, a Koji container moving device, and a control unit. The culture area is an area for culturing the Koji by storing a plurality of the Koji container in a predetermined position. The environment control device is configured to control a temperature and humidity in the culture area. The Koji container contains raw materials of Koji placed at a height of 1 cm to 10 cm, the raw materials comprising a mixture of soybeans and Koji mold. The carrying-in lane is configured to move the Koji container to the culture area.

Abstract: An object of the present invention is to obtain Koji having an enzyme titer equal to or higher than that based on conventional methods without contamination of putrefactive bacteria within 30 hours which is a very short Koji production time. The present invention provides a method for producing Koji for brewed foods, including the steps of: (1) obtaining pre-cultured seed Koji by pre-culturing Koji mold using a culture material with 500 g/L or less of bulk specific gravity, and (2) performing Koji production for 18 to 30 hours after inoculating the pre-cultured seed Koji into a protein raw material and/or a carbohydrate raw material.

Abstract: The present invention provides a brewed soy sauce that has light color and reduced smell with a robust taste. In the brewed soy sauce, HEMF is less than 15 ppm. Glutamic acid is 0.9% (w/v) or more. Lactic acid and acetic acid are respectively 0.1% (w/v) or more. Reducing sugar is 1.5% (w/v) or less. Levulinic acid is less than 0.01% (w/v). And, pH is 4.5-5.5. The brewed soy sauce is produced as follows: First, a raw material is prepared from a plant protein-source material and a low-starch carbohydrate-source material. Then, koji is made by inoculating koji mold to the prepared raw material. Next, salt water is added to the koji, and the mixture of the salt water and koji is fermented. At least 5 days after initiating the fermentation, yeast belonging to Candida genus is added to the mixture. Then, the fermentation is matured.

Abstract: The present invention provides a brewed soy sauce that has light color and reduced smell with a robust taste. In the brewed soy sauce, HEMF is less than 15 ppm. Glutamic acid is 0.9% (w/v) or more. Lactic acid and acetic acid are respectively 0.1% (w/v) or more. Reducing sugar is 1.5% (w/v) or less. Levulinic acid is less than 0.01% (w/v). And, pH is 4.5-5.5. The brewed soy sauce is produced as follows: First, a raw material is prepared from a plant protein-source material and a low-starch carbohydrate-source material. Then, koji is made by inoculating koji mold to the prepared raw material. Next, salt water is added to the koji, and the mixture of the salt water and koji is fermented. At least 5 days after initiating the fermentation, yeast belonging to Candida genus is added to the mixture. Then, the fermentation is matured.