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Article

Recoveries of Oil and Hydrolyzed Sugars from Corn Germ Meal by Hydrothermal Pretreatment: A Model Feedstock for Lipid-Producing Energy Crops

1
Department of Agricultural and Biological Engineering, University of Illinois, 1304 W. Pennsylvania Avenue, Urbana, IL 61801, USA
2
DOE Center for Advanced Bioenergy and Bioproducts Innovation, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
3
Department of Chemical Engineering, State University of New York College of Environmental Science and Forestry, Syracuse, NY 13210, USA
4
USDA, Agricultural Research Service, National Center for Agricultural Utilization Research, 1815 N University St, Peoria, IL 61604, USA
*
Author to whom correspondence should be addressed.
Energies 2020, 13(22), 6022; https://doi.org/10.3390/en13226022
Received: 20 October 2020 / Revised: 9 November 2020 / Accepted: 16 November 2020 / Published: 18 November 2020
Vegetable oil is extracted from oil rich seeds, such as soybeans. Genetic engineering of green plants to accumulate oil in vegetative tissue is a future source of oil that promises increased land productivity and the use of marginal lands. However, the low concentration of lipids in current engineered plant biomass samples makes the oil extraction process challenging and expensive. In this study, liquid hot water (LHW) pretreatment was investigated to enhance oil recovery from the solids and increase enzymatic hydrolysis efficiency of such feedstocks. Corn germ meal was chosen as a model feedstock representing lipid-producing energy crops. Germ meal was pretreated at 160 and 180 °C for 10 and 15 min at 20% w/w solids loading. Enzymatic hydrolysis on the pretreated solid was performed. After pretreatment, the oil concentration increased by 2.2 to 4.2 fold. The most severe pretreatment condition of LHW, at 180 °C for 15 min, gave the maximum oil concentration (9.7%, w/w), the highest triacylglycerol (TAG) content of the extracted oil (71.6%), and the highest conversions of glucose and xylose (99.0% and 32.8%, respectively). This study demonstrates that the optimal pretreatment condition for corn germ meal is 180 °C LHW for 15 min. Pretreatment improves lipids recovery from oil bearing biomass with little or no effect on the lipid profile. View Full-Text
Keywords: biodiesel; corn germ meal; hydrothermal pretreatment biodiesel; corn germ meal; hydrothermal pretreatment
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MDPI and ACS Style

Jia, Y.; Kumar, D.; Winkler-Moser, J.K.; Dien, B.; Singh, V. Recoveries of Oil and Hydrolyzed Sugars from Corn Germ Meal by Hydrothermal Pretreatment: A Model Feedstock for Lipid-Producing Energy Crops. Energies 2020, 13, 6022. https://doi.org/10.3390/en13226022

AMA Style

Jia Y, Kumar D, Winkler-Moser JK, Dien B, Singh V. Recoveries of Oil and Hydrolyzed Sugars from Corn Germ Meal by Hydrothermal Pretreatment: A Model Feedstock for Lipid-Producing Energy Crops. Energies. 2020; 13(22):6022. https://doi.org/10.3390/en13226022

Chicago/Turabian Style

Jia, Yuyao, Deepak Kumar, Jill K. Winkler-Moser, Bruce Dien, and Vijay Singh. 2020. "Recoveries of Oil and Hydrolyzed Sugars from Corn Germ Meal by Hydrothermal Pretreatment: A Model Feedstock for Lipid-Producing Energy Crops" Energies 13, no. 22: 6022. https://doi.org/10.3390/en13226022

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