Greener and Cheaper Technique for Biofuel Production

(Image Courtesy: Omnigen.nl)

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Greener and Cheaper Technique for Biofuel Production

By: NYU News

Natural bacterium isolated from mushroom crop residue converts plant-based material to butanol directly 

A team of engineers from the National University of Singapore (NUS) recently discovered that a naturally occurring bacterium, Thermoanaerobacterium thermosaccharolyticum TG57, isolated from waste generated after harvesting mushrooms, is capable of directly converting cellulose, a plant-based material, to biobutanol.

A research team led by Associate Professor He Jianzhong from the Department of Civil and Environmental Engineering at NUS Faculty of Engineering first discovered the novel TG57 strain in 2015. They went on to culture the strain to examine its properties.

Assoc Prof He explained, “The production of biofuels using non-food feedstocks can improve sustainability and reduce costs greatly. In our study, we demonstrated a novel method of directly converting cellulose to biobutanol using the novel TG57 strain. This is a major breakthrough in metabolic engineering and exhibits a foundational milestone in sustainable and cost-effective production of renewable biofuels and chemicals.”

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NUS engineers have found that a natural bacterium isolated from mushroom crop residue can contribute to greener and cheaper biofuel production. (NUS)

Biobutanol – An attractive biofuel

Traditional biofuels are produced from food crops. This approach is highly costly and competes with food production in the use of land, water, energy and other environmental resources. 

Biofuels produced from unprocessed cellulosic materials such as plant biomass, as well as agriculture, horticultural and organic waste, are expected to meet growing energy demands without increasing greenhouse gas emissions resulting from the burning of fossil fuels. These cellulosic materials are in great abundance, environmentally friendly, and economically sustainable. 

Among various types of biofuels, biobutanol offers a great promise as petrol substitute because of its high energy density and superior properties. It can directly replace gasoline in car engines without any modification. However, commercial production of biobutanol has been hampered by the lack of potent microbes capable of converting cellulosic biomass into biofuels. The current technique is costly and also requires complicated chemical pre-treatment.

Producing biofuel the green way

The novel technique developed by the NUS team could potentially be a game-changing technology for cost effective and sustainable biofuel production. 

Spent mushroom compost – typically composed of wheat straw and saw dust – is the residual compost waste generated by mushroom farming. The microorganisms in the waste are left to evolve naturally for more than two years to obtain the unique TG57 strain. 

The fermentation process is simple, and no complicated pre-treatment or genetic modification of the microorganisms is required. When cellulose is added, the bacterium simply digests it to produce butanol as the main product. 

Moving forward, the research team will continue to optimise the performance of the TG57 strain, and further engineer it to enhance biobutanol ratio and yield using molecular genetic tools.

The team published the findings of the study in the scientific journal Science Advances on 23 March 2018.

Reference: Tinggang Li, Chen Zhang, Kun-Lin Yang and Jianzhong He; Unique genetic cassettes in a Thermoanaerobacterium contribute to simultaneous conversion of cellulose and monosugars into butanol; Science Advances 23 Mar 2018: Vol. 4, no. 3, e1701475 DOI: 10.1126/sciadv.1701475

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About Vijay Soni 449 Articles
Vijay Soni is Ph.D. in molecular biology, microbiology, and immunology together from BITS-Pilani, Hyderabad campus and National Institute of Immunology, New Delhi, India. Currently, he is working at Weill Cornell Medical College-New York (U.S.A.) as a postdoctoral research associate. He is an expert in innovations and its translation. He is also the founder of "Scipreneur" which is a platform for the Scientific Entrepreneurs. Innovations and creativity are his passion.

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