Abstract
Increasing fermentable sugar yields per gram of biomass depends strongly on optimal selection of varieties and optimization of pretreatment conditions. In this study, dilute acid pretreatment of bagasse from six varieties of sugarcane was investigated in connection with enzymatic hydrolysis for maximum combined sugar yield (CSY). The CSY from the varieties were also compared with the results from industrial bagasse. The results revealed considerable differences in CSY between the varieties. Up to 22.7 % differences in CSY at the optimal conditions was observed. The combined sugar yield difference between the best performing variety and the industrial bagasse was 34.1 %. High ratio of carbohydrates to lignin and low ash content favored the release of sugar from the substrates. At mild pretreatment conditions, the differences in bioconversion efficiency between varieties were greater than at severe condition. This observation suggests that under less severe conditions the glucose recovery was largely determined by chemical composition of biomass. The results from this study support the possibility of increasing sugar yields or improving the conversion efficiency when pretreatment optimization is performed on varieties with improved properties.
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Acknowledgments
The authors would like to thank the South Africa Sugarcane Research Institute for providing sugarcane bagasse and for their financial support. We would like to extend our sincere gratitude to the Technology and Human Research for Industry Program for their financial support.
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Benjamin, Y., Cheng, H. & Görgens, J.F. Optimization of Dilute Sulfuric Acid Pretreatment to Maximize Combined Sugar Yield from Sugarcane Bagasse for Ethanol Production. Appl Biochem Biotechnol 172, 610–630 (2014). https://doi.org/10.1007/s12010-013-0545-z
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DOI: https://doi.org/10.1007/s12010-013-0545-z