Koji is produced by sprinkling koji mold spores, namely aspergillus onto steamed rice to breed them and it works to carry out the conversion of the starch in rice into glucose, namely carries out saccharification. (For more information, refer to "Koji.")
麹とは、蒸した米に麹菌というコウジカビの胞子をふりかけて育てたもので、米のデンプンをグルコースへ変える糖化の働きをする（詳しくは麹参照）。