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Characterization of Alkane-Producing Nostoc sp. Isolated from a Summer Bloom for Biofuel Potential

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A filamentous nitrogen-fixing cyanobacterium, Nostoc sp. strain KNUA003, was axenically isolated from a freshwater bloom sample collected from Lake Daecheong, South Korea. Based on its morphological and molecular characteristics, the isolate was identified as a member of the genus Nostoc. Maximal growth was attained when the culture was incubated at 25 °C and approximately pH 7.0. Analysis of lipid composition revealed that strain KNUA003 could autotrophically synthesize heptadecane (C17H36), which can be used as a fuel directly, without transesterification. This cyanobacterium was deduced to possess the genes for alkane biosynthesis. In addition, strain KNUA003 was found to produce a high-value long-chain fatty alcohol, hexadecenol (C20H40O), as well as other common algal biodiesel constituents, including palmitic acid (C16:0), palmitoleic acid (C16:1), linoleic acid (C18:2), and linolenic acid (C18:3), as major cellular components. The proximate analysis determines the mass percentage of volatiles in fuel and it was shown that the volatile matter content was 75.3%. The ultimate analysis is a chemical analysis of the elements in biomass fuel and the results indicated that the higher heating value was 15.4 MJ kg–1. Therefore, Nostoc sp. KNUA003 shows promise for application in cost-effective production of microalgae-based biofuels and as a biomass feedstock.
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Keywords: ALKANE-PRODUCING GENES; BIOFUEL; CYANOBACTERIA; HEPTADECANE; POTENTIAL FEEDSTOCK

Document Type: Research Article

Publication date: June 1, 2018

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  • The goal of the creation of a biobased economy is challenging to agriculture, forestry, academia, government and industry. The extractable resources of the Earth are finite, regardless of the quibble over when they will be depleted. The economic, political and social demands for biobased chemicals, materials and energy are expected to radically transform the materials industries, particularly the plastics industry as well as the biofuel industry. These changes will be based on the principles of sustainability, eco-efficiency, industrial ecology, and green chemistry and engineering. In keeping with the growth of knowledge in this field, there is a strong need for a forum to share original research related to biobased materials and bioenergy. The Journal of Biobased Materials and Bioenergy (JBMB) has been created as an international peer-reviewed periodical to fulfill the need for communication in these research areas. This journal will encompass related research activities in all fields of science, engineering and the life sciences.
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