A total of 190 ml of fermentation supernatant containing 13.2% ethanol, equivalent to 19.8 g of pure ethanol, was produced from the 250-ml fermentation bottle that contained 100 g of uncooked fresh sweet potato storage roots (containing 29.4 g of carbohydrates) in addition to the media of the microbial inocula, which included 8 g of wheat bran (containing 5.6 g of carbohydrates),