Microalgal Biomass as an Alternative Source of Sugars for the Production of Bioethanol

Smachetti, María Eugenia Sanz; Rizza, Lara Sánchez; Coronel, Camila Denise; Nascimento, Mauro Do; Curatti, Leonardo

doi:10.1002/9781119460381.ch16

Cited by 12 publications

(9 citation statements)

References 131 publications

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“…While acid hydrolysis, mostly using diluted sulfuric acid, requires high temperatures and produces large volume of contaminating residues, enzymatic hydrolysis can be completed under milder temperatures, although it still requires some physical or chemical pretreatments, and it is considerably more expensive (Hernández et al, 2015). Nevertheless, both strategies lead to biomass saccharification and conversion into ethanol by microbial fermentation with an efficiency very close to the upper theoretical value, as recently compiled by Sanchez Rizza and co-workers (Sanchez Rizza et al, 2017;Sanz Smachetti et al, 2018).…”

Section: Introductionmentioning

confidence: 91%

“…PCC 7120 cells at about 8 g in three days (two for biomass production and one for fermentation). Regardless of this progress, it becomes quite evident that achievable yields are still far away in comparison to plant feedstocks (Sanz Smachetti et al, 2018) to envision commercial competitiveness of a platform dedicated to the production of only ethanol. However, ethanol production might be considered if it occurs within a biomass biorefinery for additional products (Laurens et al, 2017), and especially, if it minimizes the use of chemicals and enzymes.…”

Section: Ethanol Production From Anabaena Sugar Preparationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Microalgal and/or cyanobacterial carbohydrates present considerable advantages over plant-based feedstocks for the production of ethanol (Sanz Smachetti et al, 2018). The lack of lignin and its simpler structure tend to make the pretreatment and saccharification of microalgae or cyanobacterial polysaccharides less energy-intensive and reagent-demanding than current plant-based feedstocks (Sanz Smachetti et al, 2018). It has been shown that microalgal and cyanobacterial carbohydrate-rich biomass can be efficiently hydrolyzed into monosaccharides by chemical (acid or alkaline)/physicochemical or enzymatic hydrolysis (Hernández et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Ethanol and protein production from minimally processed biomass of a genetically-modified cyanobacterium over-accumulating sucrose

Smachetti

Cenci

Salerno

et al. 2019

Bioresource Technology Reports

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One of the main bottlenecks of a microalgal or cyanobacterial biomass biorefinery is the separation of different useful fractions using simple, low energy-consuming, cost-effective, and scalable separation processes. Although the carbohydrates-rich biomass of these microorganisms presents clear advantages over conventional terrestrial crops as feedstocks for ethanol, it still requires acid and/or enzymatic hydrolysis for efficient fermentation. Here, we show the genetic modification of carbohydrates partitioning in a filamentous cyanobacterium towards the accumulation of sucrose up to 10% (w/w) as a readily fermentable feedstock. We optimized two methods for the preparation of concentrated sucrose syrups, which were efficiently converted into ethanol by yeasts, without the need of additional pretreatments. Biomass drying and milling, followed by aqueous extraction of sugars and proteins, and the recovery of proteins by short pulses of heat, kept the value of sugars as a feedstock for ethanol and protein for feed supplements within a cost-effective biomass biorefinery.

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Section: Introductionmentioning

confidence: 91%

Section: Ethanol Production From Anabaena Sugar Preparationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Ethanol and protein production from minimally processed biomass of a genetically-modified cyanobacterium over-accumulating sucrose

Smachetti

Cenci

Salerno

et al. 2019

Bioresource Technology Reports

Self Cite

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show abstract

“…The production of bioethanol from microalgae gained importance due to their high biomass productivity, diversity, variable chemical composition, and high photosynthetic rates of these organisms [53]. Due to the large amount of carbohydrates/polysaccharides and cellulose walls, these microorganisms become favorable for the production of this biofuel [54,55]. In many countries, ethanol is produced on a large scale from crops containing sugars and starches in its composition through fermentation.…”

Section: Applicationsmentioning

confidence: 99%

Concepts and Trends for Extraction and Application of Microalgae Carbohydrates

Souza¹,

Sanchez-Barrios²,

Rizzetti³

et al. 2020

Microalgae - From Physiology to Application

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The proposed chapter aims to provide a more in-depth explanation of the composition of carbohydrates in microalgae biomass, focusing on separation methods, chemistry, molecular characterization, as well as their application in several areas. The purpose of this review chapter is to show that biological products from microalgae have potential in health, food, and industry applications (materials and biofuel production). Steps for extraction and purification will be discussed, as well as the relationship between the type of microalgae and its composition, as a way of optimizing protocol selection and product making, without breaking down the cell to begin with (total carbohydrate extraction present in the cell). An overall overview of the current and prospective trends and methodologies for the use of microalgae carbohydrate will be included as starting points to shed light on some of the possible issues that currently do not allow the development and feasibility of microalgae biorefineries.

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Macro and Micro Algae in Pollution Control and Biofuel Production – A Review

2020

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Microalgae are biological sources with an extensive range of biotechnological applications, e.g., for bioremediation of industrial and municipal wastes. Microalgae are used to monitor environmental toxicants like pesticides, heavy metals, and pharmaceuticals and in the final stage of wastewater treatment when organic pollution should be removed. CO 2 capturing is also important due to the environmental issues. Macro/microalgae cultures, depending on their growth stages and life cycles, have great poten-tial for CO 2 fixation. They are a dominant group of microorganisms for biological treatments with regards to their substantial biosorption ability to deactivate toxic heavy metals. Actual carbon biofixation can be employed in the direction of environmental sustainability and economic facility. Besides, algae are sustainable feedstock to produce a wide range of biofuels by applying thermochemical or biological conversion methods.

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Microalgal Biomass as an Alternative Source of Sugars for the Production of Bioethanol

Cited by 12 publications

References 131 publications

Ethanol and protein production from minimally processed biomass of a genetically-modified cyanobacterium over-accumulating sucrose

Ethanol and protein production from minimally processed biomass of a genetically-modified cyanobacterium over-accumulating sucrose

Concepts and Trends for Extraction and Application of Microalgae Carbohydrates

Macro and Micro Algae in Pollution Control and Biofuel Production – A Review

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