What You Need to Know
The process begins with lactic acid bacteria (typically Lactobacillus spp.) creating an acidic environment that suppresses wild microbes, followed by progressive yeast propagation. Steamed rice provides fermentable starches while koji (Aspergillus oryzae) supplies amylases for saccharification. Water chemistry, particularly magnesium and potassium levels, critically impacts microbial succession.
Shubo determines the flavor profile and fermentation vigor of final sake. Traditional methods like kimoto and yamahai involve manual mashing to encourage natural lactic acid production, while modern sokujo method uses added lactic acid for consistency. The starter's development is judged by bubble patterns and aroma evolution.
Key Parameters
Temperature
12°C
10°C - 15°C
Time
10 days
7 days - 14 days
Equipment
Steps
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The Science
Primary Reaction
Glycolysis