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Mild acid pretreatment and enzyme saccharification of Sorghum bicolor straw

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  • Vancov, T.
  • McIntosh, S.

Abstract

Dilute sulphuric acid pretreatment followed by enzyme saccharification of Sorghum bicolor straw was undertaken to examine its potential as a feedstock in bioethanol production in Australia. Factorial design experiments evaluated the impact of pretreatment parameters on hemicellulose solubilisation and cellulose enzymatic hydrolysis. Sugar yields in prehydrolysate and saccharified liquors were found to increase with treatment severity; temperature was found to have the greatest impact. Degradation products were minimal; acetate and total phenolics peaked at 33 and 1.5mg/g respectively. Conditions for maximum hemicellulose solubilisation (2% H2SO4 for 60min at 121°C) differed to those associated with maximum glucose release from solid residue saccharifications (1% H2SO4/90min /121°C). Water extractive sugars accounted for over 20% total sugars recovered. Addition of β-glucosidase and xylanase to enzyme saccharification enhanced reaction rates and final sugar yields three-fold, whilst reducing cellulase dosage. Considering its abundance, high sugar potential and apparent ease of conversion, sorghum straw is an appropriate feedstock for the production of second generation fuels.

Suggested Citation

  • Vancov, T. & McIntosh, S., 2012. "Mild acid pretreatment and enzyme saccharification of Sorghum bicolor straw," Applied Energy, Elsevier, vol. 92(C), pages 421-428.
    • Handle: RePEc:eee:appene:v:92:y:2012:i:c:p:421-428
    DOI: 10.1016/j.apenergy.2011.11.053
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    Cited by:

    1. Banerji, Aditi & Balakrishnan, M. & Kishore, V.V.N., 2013. "Low severity dilute-acid hydrolysis of sweet sorghum bagasse," Applied Energy, Elsevier, vol. 104(C), pages 197-206.
    2. Sun, Shao-Long & Wen, Jia-Long & Ma, Ming-Guo & Sun, Run-Cang, 2014. "Enhanced enzymatic digestibility of bamboo by a combined system of multiple steam explosion and alkaline treatments," Applied Energy, Elsevier, vol. 136(C), pages 519-526.
    3. Choi, Chang Ho & Um, Byung Hwan & Kim, Young Soo & Oh, Kyeong Keun, 2013. "Improved enzyme efficiency of rapeseed straw through the two-stage fractionation process using sodium hydroxide and sulfuric acid," Applied Energy, Elsevier, vol. 102(C), pages 640-646.
    4. Favaro, Lorenzo & Basaglia, Marina & van Zyl, Willem H. & Casella, Sergio, 2013. "Using an efficient fermenting yeast enhances ethanol production from unfiltered wheat bran hydrolysates," Applied Energy, Elsevier, vol. 102(C), pages 170-178.
    5. Choi, In Seong & Kim, Jae-Hoon & Wi, Seung Gon & Kim, Kyoung Hyoun & Bae, Hyeun-Jong, 2013. "Bioethanol production from mandarin (Citrus unshiu) peel waste using popping pretreatment," Applied Energy, Elsevier, vol. 102(C), pages 204-210.
    6. Lima, Clebson S.S. & Conceição, Marta M. & Silva, Flávio L.H. & Lima, Ezenildo E. & Conrado, Líbia S. & Leão, Douglas A.S., 2013. "Characterization of acid hydrolysis of sisal," Applied Energy, Elsevier, vol. 102(C), pages 254-259.
    7. Stoumpou, Vasileia & Novakovic, Jelica & Kontogianni, Nikoleta & Barampouti, Elli Maria & Mai, Sofia & Moustakas, Kostantinos & Malamis, Dimitris & Loizidou, Maria, 2020. "Assessing straw digestate as feedstock for bioethanol production," Renewable Energy, Elsevier, vol. 153(C), pages 261-269.
    8. Jin, Wenxiang & Chen, Ling & Hu, Meng & Sun, Dan & Li, Ao & Li, Ying & Hu, Zhen & Zhou, Shiguang & Tu, Yuanyuan & Xia, Tao & Wang, Yanting & Xie, Guosheng & Li, Yanbin & Bai, Baowei & Peng, Liangcai, 2016. "Tween-80 is effective for enhancing steam-exploded biomass enzymatic saccharification and ethanol production by specifically lessening cellulase absorption with lignin in common reed," Applied Energy, Elsevier, vol. 175(C), pages 82-90.
    9. Ranjan, Amrita & Khanna, Swati & Moholkar, V.S., 2013. "Feasibility of rice straw as alternate substrate for biobutanol production," Applied Energy, Elsevier, vol. 103(C), pages 32-38.
    10. Barakat, Abdellatif & Chuetor, Santi & Monlau, Florian & Solhy, Abderrahim & Rouau, Xavier, 2014. "Eco-friendly dry chemo-mechanical pretreatments of lignocellulosic biomass: Impact on energy and yield of the enzymatic hydrolysis," Applied Energy, Elsevier, vol. 113(C), pages 97-105.

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