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Starters and koji from Kagoshima and the rest of Kyushu, Japan
White koji (shiro-koji)白麹
White koji is steamed rice or barley grown with the albino mutant of the black awamori mould. It is grown for about 42 hours; the koji is mixed three times as it heats to about 40 °C, then held cooler so the mould makes citric acid. Many shochu makers use it, because it keeps black koji's acid and enzymes without the black colour.
Amounts from a sourceThe amounts are a university lab method that follows the mixing points of industrial shochu koji, not a distillery recipe.
Polished rice600 g
Soaked 1 h, drained 1 h, steamed 1 h, cooled to 45 °C (lab method)[wang2023]
White koji seed culture6 g
A commercial seed from Kawachi Gen-ichiro Shoten, Kagoshima, in the lab method[wang2023]
Starter
defined-culture: white koji spores (A. luchuensis mut. kawachii, an albino mutant of the black koji mould)
Total time across the recorded steps: 45 h
Start
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What changes:Soaked rice is steamed and cooled
Step 1 of 4
Soak, drain and steam the rice
Time
3 h
Reported
Temperature
45 °C
Reported
Salt
None given
Acidity
Not documented
Which microbes the steps name, step by step
Moulds
Output: steamed rice.
Flavour
Not documented
Texture
Not documented
Colour
Not documented
Microbes at work in this step
Not documented for this step.
Method
Measured measured in a studySet fixed by a specification or tested recipeReported one source reports itTypical a general value, not sourced for this fermentUnconfirmed not yet checked against a source
At a glance
White koji is steamed rice or barley grown with the albino mutant of the black awamori mould. It is grown for about 42 hours; the koji is mixed three times as it heats to about 40 °C, then held cooler so the mould makes citric acid. Many shochu makers use it, because it keeps black koji's acid and enzymes without the black colour. Made in 4 steps over 45 h. The longest step, seed and keep warm in a heap (tane-tsuke), takes 19 h (Wang T 2023) and runs at 35–38 °C (Wang T 2023). Aspergillus luchuensis mut. kawachii does most of the fermenting.
The citric acid the mould makes keeps the mash pH low and holds back microbes other than the yeast. White koji belongs to Aspergillus section Nigri, which also holds A. niger; some A. niger strains make ochratoxin or fumonisin, but Hayashi et al. state that the three koji fungi used for shochu and awamori cannot make mycotoxins.
Shochu was first made with yellow koji; Kagoshima makers took up black koji from Okinawa around 1910, and the Satsuma GI rules record black and white koji among the Meiji-era advances. In the early 1900s a white colony was picked out of black koji to get a colourless strain, named Aspergillus kawachii. Molecular work later found black and white koji to be the same species, and it was renamed A. luchuensis mut. kawachii.