Bioethanol is one of the main bio-based molecules produced mainly from sugar cane, molasses and corn. Its environmental advantages allow it to be considered as safe and the cleanest fuel alternative. Starch is a widespread renewable carbohydrate conventionally used for bioethanol production via energy demanding liquefaction and saccharification processes. Raw starch hydrolysis using enzymes capable of degrading it below the gelatinization temperature significantly simplifies the process and reduces the cost of starch processing. In this study, an innovative modified simultaneous saccharification and fermentation process is proposed for the production of bioethanol from highly concentrated raw corn starch (30 % w/v). A two-step synergistic hydrolysis and fermentation was carried out in a single bioreactor vessel. To ensure high process efficiency, factors influencing the hydrolysis of concentrated raw corn starch by raw starch degrading α-amylase from Bacillus paralicheniformis ATCC 994...5a (BliAmy) and commercial glucoamylase were investigated. Box–Behnken experimental design was used to predict the effects of different ratios of added enzymes, glucoamylase addition time, incubation time, and pH on hydrolysis yield. Optimal conditions for the highest yield of hydrolysis of raw corn starch (90 %) were obtained after 8 h using 5.0 IU BliAmy per mg of starch and 0.5 % (v/v) glucoamylase at pH 4.5 and 60 °C. Obtained glucose was further fermented with Saccharomyces cerevisiae at 30 °C in the same vessel for bioethanol production. Bioethanol concentration at 129.2 g/L, with productivity of 2.94 g/L/h and ethanol yield (YP/S) at 0.50 g EtOH/g total sugar, equivalent to 87.8 % theoretical yield, was obtained by modified simultaneous saccharification and fermentation. This work enriches the information of bioethanol production and offers a novel strategy for raw starch hydrolysis under industrial conditions.
TY - JOUR
AU - Šokarda Slavić, Marinela
AU - Margetić, Aleksandra
AU - Dojnov, Biljana
AU - Vujčić, Miroslava
AU - Mišić, Milan
AU - Božić, Nataša
AU - Vujčić, Zoran
PY - 2023
UR - http://cherry.chem.bg.ac.rs/handle/123456789/5796
AB - Bioethanol is one of the main bio-based molecules produced mainly from sugar cane, molasses and corn. Its environmental advantages allow it to be considered as safe and the cleanest fuel alternative. Starch is a widespread renewable carbohydrate conventionally used for bioethanol production via energy demanding liquefaction and saccharification processes. Raw starch hydrolysis using enzymes capable of degrading it below the gelatinization temperature significantly simplifies the process and reduces the cost of starch processing. In this study, an innovative modified simultaneous saccharification and fermentation process is proposed for the production of bioethanol from highly concentrated raw corn starch (30 % w/v). A two-step synergistic hydrolysis and fermentation was carried out in a single bioreactor vessel. To ensure high process efficiency, factors influencing the hydrolysis of concentrated raw corn starch by raw starch degrading α-amylase from Bacillus paralicheniformis ATCC 9945a (BliAmy) and commercial glucoamylase were investigated. Box–Behnken experimental design was used to predict the effects of different ratios of added enzymes, glucoamylase addition time, incubation time, and pH on hydrolysis yield. Optimal conditions for the highest yield of hydrolysis of raw corn starch (90 %) were obtained after 8 h using 5.0 IU BliAmy per mg of starch and 0.5 % (v/v) glucoamylase at pH 4.5 and 60 °C. Obtained glucose was further fermented with Saccharomyces cerevisiae at 30 °C in the same vessel for bioethanol production. Bioethanol concentration at 129.2 g/L, with productivity of 2.94 g/L/h and ethanol yield (YP/S) at 0.50 g EtOH/g total sugar, equivalent to 87.8 % theoretical yield, was obtained by modified simultaneous saccharification and fermentation. This work enriches the information of bioethanol production and offers a novel strategy for raw starch hydrolysis under industrial conditions.
T2 - Fuel
T1 - Modified simultaneous saccharification and fermentation for the production of bioethanol from highly concentrated raw corn starch
VL - 338
SP - 127363
DO - 10.1016/j.fuel.2022.127363
ER -
@article{
author = "Šokarda Slavić, Marinela and Margetić, Aleksandra and Dojnov, Biljana and Vujčić, Miroslava and Mišić, Milan and Božić, Nataša and Vujčić, Zoran",
year = "2023",
abstract = "Bioethanol is one of the main bio-based molecules produced mainly from sugar cane, molasses and corn. Its environmental advantages allow it to be considered as safe and the cleanest fuel alternative. Starch is a widespread renewable carbohydrate conventionally used for bioethanol production via energy demanding liquefaction and saccharification processes. Raw starch hydrolysis using enzymes capable of degrading it below the gelatinization temperature significantly simplifies the process and reduces the cost of starch processing. In this study, an innovative modified simultaneous saccharification and fermentation process is proposed for the production of bioethanol from highly concentrated raw corn starch (30 % w/v). A two-step synergistic hydrolysis and fermentation was carried out in a single bioreactor vessel. To ensure high process efficiency, factors influencing the hydrolysis of concentrated raw corn starch by raw starch degrading α-amylase from Bacillus paralicheniformis ATCC 9945a (BliAmy) and commercial glucoamylase were investigated. Box–Behnken experimental design was used to predict the effects of different ratios of added enzymes, glucoamylase addition time, incubation time, and pH on hydrolysis yield. Optimal conditions for the highest yield of hydrolysis of raw corn starch (90 %) were obtained after 8 h using 5.0 IU BliAmy per mg of starch and 0.5 % (v/v) glucoamylase at pH 4.5 and 60 °C. Obtained glucose was further fermented with Saccharomyces cerevisiae at 30 °C in the same vessel for bioethanol production. Bioethanol concentration at 129.2 g/L, with productivity of 2.94 g/L/h and ethanol yield (YP/S) at 0.50 g EtOH/g total sugar, equivalent to 87.8 % theoretical yield, was obtained by modified simultaneous saccharification and fermentation. This work enriches the information of bioethanol production and offers a novel strategy for raw starch hydrolysis under industrial conditions.",
journal = "Fuel",
title = "Modified simultaneous saccharification and fermentation for the production of bioethanol from highly concentrated raw corn starch",
volume = "338",
pages = "127363",
doi = "10.1016/j.fuel.2022.127363"
}
Šokarda Slavić, M., Margetić, A., Dojnov, B., Vujčić, M., Mišić, M., Božić, N.,& Vujčić, Z.. (2023). Modified simultaneous saccharification and fermentation for the production of bioethanol from highly concentrated raw corn starch. in Fuel, 338, 127363.
https://doi.org/10.1016/j.fuel.2022.127363
Šokarda Slavić M, Margetić A, Dojnov B, Vujčić M, Mišić M, Božić N, Vujčić Z. Modified simultaneous saccharification and fermentation for the production of bioethanol from highly concentrated raw corn starch. in Fuel. 2023;338:127363.
doi:10.1016/j.fuel.2022.127363 .
Šokarda Slavić, Marinela, Margetić, Aleksandra, Dojnov, Biljana, Vujčić, Miroslava, Mišić, Milan, Božić, Nataša, Vujčić, Zoran, "Modified simultaneous saccharification and fermentation for the production of bioethanol from highly concentrated raw corn starch" in Fuel, 338 (2023):127363,
https://doi.org/10.1016/j.fuel.2022.127363 . .
