Cyanofuels: biofuels from cyanobacteria. Reality and perspectives

Sarsekeyeva, Fariza K.; Zayadan, B. K.; Usserbaeva, Aizhan A.; Bedbenov, Vladimir S.; Sinetova, Maria A.; Los, Dmitry A.

doi:10.1007/s11120-015-0103-3

Cited by 96 publications

(64 citation statements)

References 87 publications

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“…Therefore, it could be concluded that this scheme is unproductive for light energy bioconversion due to the numerous intermediate steps. Alternatively, direct light-dependent production of biofuels (ethanol, lipids, or hydrogen) by microalgae as elaborated by Sarsekeyeva et al (2015) and Tsygankov and Abdullatypov (2015) might be more profitable.…”

Section: Discussionmentioning

confidence: 99%

Mass-energy balance analysis for estimation of light energy conversion in an integrated system of biological H2 production

Gavrisheva¹,

Belokopytov²,

Semina³

et al. 2015

Biofuel Res. J.

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The present study investigated an integrated system of biological H2 production, which includes the accumulation of biomass of autotrophic microalgae, dark fermentation of biomass, and photofermentation of the dark fermentation effluent. Particular emphasis was placed on the estimation of the conversion efficiency of light into hydrogen energy at each stage of this system. For this purpose, the mass and energy balance regularities were applied. The efficiency of the energy transformation from light into the microalgal biomass did not exceed 5%. The efficiency of the energy transformation from biomass to biological H2 during the dark fermentation stage stood at about 0.3%. The photofermentation stage using the model fermentation effluent could improve this estimation to 11%, resulting in an overall efficiency of 0.55%. Evidently, this scheme is counterproductive for light energy bioconversion due to numerous intermediate steps even if the best published data would be taken into account. © 2015 BRTeam. All rights reserved.The conversion of light energy into H2 was examined in an integrated three-stage scheme. Mass-energy balance regularities were applied to estimate energy conversion efficiencies at different stages.This three-stage scheme was found counterproductive for light energy bioconversion to H2.Please cite this article as: Gavrisheva A.I., Belokopytov B.F., Semina V.I., Shastik E.S., Laurinavichene T.V., Tsygankov A.A. Mass-energy balance analysis for estimation of light energy conversion in an integrated system of biological H2 production.

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Section: Discussionmentioning

confidence: 99%

Mass-energy balance analysis for estimation of light energy conversion in an integrated system of biological H2 production

Gavrisheva¹,

Belokopytov²,

Semina³

et al. 2015

Biofuel Res. J.

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“…Among various beneficial microbes, cyanobacteria can be used in nutrition, energy and agriculture sector because of their ability to fix atmospheric N 2 and CO 2 , and produce energy rich biomass containing myriad of metabolites of economic importance. Furthermore, recent developments in cyanobacterial screening, cultivation, and gene manipulation techniques have enabled new ways to utilize the potential of these photosynthetic microbes to deal with socio-economic problems (Sarsekeyeva et al, 2015).…”

Section: Sustainable Agriculture and Microbesmentioning

confidence: 99%

“…Therefore, generation of microbiological energy through massive solar energy transformation permits harvesting various forms of eco-friendly energy reserves (Hall et al, 1995;Paumann et al, 2005). The aforementioned characteristics make cyanobacteria potential microorganisms for their application as feedstocks for sustainable production of food and non-food commodities, including valuable chemicals and bioenergy (Wase and Wright, 2008;Sarsekeyeva et al, 2015;Rajneesh et al, 2017). Cyanobacteria produce a number of valuable compounds such as ethanol, butanol, fatty acids, and other organic acids, and therefore, are promising candidates for fulfilling our energy demands in a sustainable manner .…”

Section: Introductionmentioning

confidence: 99%

Cyanobacterial Farming for Environment Friendly Sustainable Agriculture Practices: Innovations and Perspectives

Pathak

Rajneesh

Maurya

et al. 2018

Front. Environ. Sci.

179

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Sustainable supply of food and energy without posing any threat to environment is the current demand of our society in view of continuous increase in global human population and depletion of natural resources of energy. Cyanobacteria have recently emerged as potential candidates who can fulfill abovementioned needs due to their ability to efficiently harvest solar energy and convert it into biomass by simple utilization of CO 2 , water and nutrients. During conversion of radiant energy into chemical energy, these biological systems produce oxygen as a by-product. Cyanobacterial biomass can be used for the production of food, energy, biofertilizers, secondary metabolites of nutritional, cosmetics, and medicinal importance. Therefore, cyanobacterial farming is proposed as environment friendly sustainable agricultural practice which can produce biomass of very high value. Additionally, cyanobacterial farming helps in decreasing the level of greenhouse gas, i.e., CO 2 , and it can be also used for removing various contaminants from wastewater and soil. However, utilization of cyanobacteria for resolving the abovementioned problems is subjected to economic viability. In this review, we provide details on different aspects of cyanobacterial system that can help in developing sustainable agricultural practices. We also describe different large-scale cultivation systems for cyanobacterial farming and discuss their merits and demerits in terms of economic profitability.

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“…The production of biofuel from cyanobacteria has several advantages [discussed by Quintana et al (2011) and Sarsekeyeva et al (2015)]. Among these advantages is the fact that many cyanobacteria, e.g., Spirulina and Synechococcus, accumulate high amounts of glycogen, which can be easily extracted and fermented to ethanol (See Conversion of Glycogen to Glucose).…”

Section: Cyanobacteria Serve As a Minor Source For Third-generation Bmentioning

confidence: 99%

The Enzymatic Conversion of Major Algal and Cyanobacterial Carbohydrates to Bioethanol

2016

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The production of fuels from biomass is categorized as first-, second-, or thirdgeneration depending upon the source of raw materials, either food crops, lignocellulosic material, or algal biomass, respectively. Thus far, the emphasis has been on using food crops creating several environmental problems. To overcome these problems, there is a shift toward bioenergy production from non-food sources. Algae, which store high amounts of carbohydrates, are a potential producer of raw materials for sustainable production of bioethanol. Algae store their carbohydrates in the form of food storage sugars and structural material. In general, algal food storage polysaccharides are composed of glucose subunits; however, they vary in the glycosidic bond that links the glucose molecules. In starch-type polysaccharides (starch, floridean starch, and glycogen), the glucose subunits are linked together by α-(1→4) and α-(1→6) glycosidic bonds. Laminarin-type polysaccharides (laminarin, chrysolaminarin, and paramylon) are made of glucose subunits that are linked together by β-(1→3) and β-(1→6) glycosidic bonds. In contrast to food storage polysaccharides, structural polysaccharides vary in composition and glycosidic bond. The industrial production of bioethanol from algae requires efficient hydrolysis and fermentation of different algal sugars. However, the hydrolysis of algal polysaccharides employs more enzymatic mixes in comparison to terrestrial plants. Similarly, algal fermentable sugars display more diversity than plants, and therefore more metabolic pathways are required to produce ethanol from these sugars. In general, the fermentation of glucose, galactose, and glucose isomers is carried out by wild-type strains of Saccharomyces cerevisiae and Zymomonas mobilis. In these strains, glucose enters glycolysis, where is it converted to pyruvate through either Embden-Meyerhof-Parnas pathway or Entner-Doudoroff pathway. Other monosaccharides must be converted to fermentable sugars before entering glycolysis. In contrast, microbial wild-type strains are not capable of producing ethanol from alginate, and therefore the production of bioethanol from alginate was achieved by using genetically engineered microbial strains, which can simultaneously hydrolyze and ferment alginate to ethanol. In this review, we emphasize the enzymatic hydrolysis processes of different algal polysaccharides. Additionally, we highlight the major metabolic pathways that are employed to ferment different algal monosaccharides to ethanol.

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Cyanofuels: biofuels from cyanobacteria. Reality and perspectives

Cited by 96 publications

References 87 publications

Mass-energy balance analysis for estimation of light energy conversion in an integrated system of biological H2 production

Mass-energy balance analysis for estimation of light energy conversion in an integrated system of biological H2 production

Cyanobacterial Farming for Environment Friendly Sustainable Agriculture Practices: Innovations and Perspectives

The Enzymatic Conversion of Major Algal and Cyanobacterial Carbohydrates to Bioethanol

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