Bioethanol Production from A-Starch Milk and B-Starch Milk as Intermediates of Industrial Wet-Milling Wheat Processing
2024
Aleksandra Katanski | Vesna Vučurović | Damjan Vučurović | Bojana Bajić | Žana Šaranović | Zita Šereš | Siniša Dodić
The present work highlights the advances of integrated starch and bioethanol production as an attractive industrial solution for complex wheat exploitation to value-added products focusing on increased profitability. Bioethanol is conventionally produced by dry-milling wheat grain and fermenting sugars obtained by the hydrolysis of starch, while unused nonfermentable kernel compounds remain in stillage as effluents. On the other hand, the wet-milling of wheat flour enables complex wheat processing for the simultaneous production of starch, gluten, and fiber. The intermediates of industrial wheat starch production are A-starch milk, containing mainly large starch granules (diameter >: 10 &mu:m), and B-starch milk, containing mainly small starch granules (diameter <: 10 &mu:m). The present study investigates different starch hydrolysis procedures using commercial amylase for bioethanol production from A-starch and B-starch milk by batch fermentation using distillers&rsquo: yeast Saccharomyces cerevisiae Thermosacc®:. Cold hydrolysis with simultaneous liquefaction and saccharification at 65 °:C, a pH of 4.5, and a duration of 60 min was the most efficient and energy-saving pretreatment reaching a high conversion rate of starch to ethanol of 93% for both of the investigated substrates. A process design and cost model of bioethanol production from A-starch and B-starch milk was developed using the SuperPro Designer®: v.11 (Intelligen Inc., Scotch Plains, NJ, USA) software.
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