Hydrothermal nitric acid treatment for effectual lipid extraction from wet microalgae biomass

Lee, Il Gyu; Park, Jiyeon; Choi, Suna; Oh, You-Kwan; Han, Jong‐In

doi:10.1016/j.biortech.2014.08.101

Cited by 30 publications

(7 citation statements)

References 28 publications

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“…Before the fermentation, pretreatment and enzymatic conversions are common methods to realize saccharification in hydrolysis processes. Acid hydrolysis, enzymatic pretreatment and selection of hypercellulolytic mutants are efficient in production of bioethanol [ 27 , 29 ]. For example, Harun et al [ 30 ] had reported that acid pretreatment increased bioethanol yield by 2.25-fold and Choi et al [ 31 ] had proved the high efficiency of enzymatic process in bioethanol.…”

Section: Carbon Metabolism In Microalgaementioning

confidence: 99%

High-value biomass from microalgae production platforms: strategies and progress based on carbon metabolism and energy conversion

Sun

Zhao

Mao

et al. 2018

Biotechnol Biofuels

115

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Microalgae are capable of producing sustainable bioproducts and biofuels by using carbon dioxide or other carbon substances in various cultivation modes. It is of great significance to exploit microalgae for the economical viability of biofuels and the revenues from high-value bioproducts. However, the industrial performance of microalgae is still challenged with potential conflict between cost of microalgae cultivation and revenues from them, which is mainly ascribed to the lack of comprehensive understanding of carbon metabolism and energy conversion. In this review, we provide an overview of the recent advances in carbon and energy fluxes of light-dependent reaction, Calvin–Benson–Bassham cycle, tricarboxylic acid cycle, glycolysis pathway and processes of product biosynthesis in microalgae, with focus on the increased photosynthetic and carbon efficiencies. Recent strategies for the enhanced production of bioproducts and biofuels from microalgae are discussed in detail. Approaches to alter microbial physiology by controlling light, nutrient and other environmental conditions have the advantages of increasing biomass concentration and product yield through the efficient carbon conversion. Engineering strategies by regulating carbon partitioning and energy route are capable of improving the efficiencies of photosynthesis and carbon conversion, which consequently realize high-value biomass. The coordination of carbon and energy fluxes is emerging as the potential strategy to increase efficiency of carbon fixation and product biosynthesis. To achieve more desirable high-value products, coordination of multi-stage cultivation with engineering and stress-based strategies occupies significant positions in a long term.

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Section: Carbon Metabolism In Microalgaementioning

confidence: 99%

High-value biomass from microalgae production platforms: strategies and progress based on carbon metabolism and energy conversion

Sun

Zhao

Mao

et al. 2018

Biotechnol Biofuels

115

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“…After pretreatment at optimal conditions (10%, w/w, H 2 SO 4 , 150°C), the authors reported a near-complete sugar release and a twice higher lipid extraction based on extractable lipids. Likewise, Lee et al (2014) applied hydrothermal nitric acid treatment from pure Nannochloropsis sp. and achieved 24.4% of lipid extraction at optimal conditions compared to 5.2% from untreated samples.…”

Section: Combined Methods For Cell Wall Disruptionmentioning

confidence: 99%

Cell disruption technologies

Dhondt

Martín-Juárez

Bolado

et al. 2017

Microalgae-Based Biofuels and Bioproducts

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IntroductionAlgal cell walls separate the inside cell content from the environment to protect the cell against desiccation, pathogens, and predators while still allowing exchange of compounds. Toward application of algae biomass as a sustainable resource, disruption of this cell wall (¼cell disruption) is an essential pretreatment step to maximize product recovery in downstream processes of the algae biorefinery. Also for direct use of algae in feed or food, cell rupture is required to increase the bioavailability of algae constituents. Depending on the cell wall structure, the size, and the shape of algae, cell disruption can be challenging. A variety of cell disruption methods is currently available, and new approaches are being elaborated in parallel. Since downstream processing is responsible for a large part of the operational costs in the whole production chain, cell disruption technologies should be low cost and energy efficient and result preferably in high product quality. This chapter provides information on cell wall types and gives an overview of physical-mechanical and (bio-)chemical cell disruption technologies with attention to development stage, energy efficiency, product quality, costs, emerging approaches, and applicability on large scale. Cell wall types in various groups of microalgae and cyanobacteriaThe cell wall composition and architecture of algae and cyanobacteria are highly variable ranging from tiny membranes to multilayered complex structures. Despite the importance of algal cell wall properties in biotechnology, little structural information is available for most species (Scholz et al., 2014). Based on the complexity of surface structures, four cell types could be distinguished (Barsanti and Gualtieri, 2006;Lee, 2008) (Fig. 6.1). A simple cell membrane (Fig. 6.1, Type 1) is present in short-lived stages (e.g., gametes), chrysophytes, raphidophytes, green algae Dunaliella, and haptophytes Isochrysis. It consists of a lipid bilayer with integrated and peripheral proteins. Sometimes a cap of glycolipids and glycoproteins envelops the outer surface of cell membrane. Cell membranes with additional extracellular material are known in cyanobacteria and many groups of algae, including palmelloid phases. It is the most diverse cell wall type that includes various membrane-associated structures (cell wall, Microalgae-Based Biofuels and Bioproducts. http://dx

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“…Table 8 Lipid extraction yields remain relatively low (< 30%) below CSF values of 1.4, whereas lipid yields up to 88% are reported at CSF of 1.9 (Lee et al, 2014). This indicates that relatively high cellular wall degradation is required to enable efficient intracellular lipids solvent extraction Although the degree of cell disruption is not reported by the authors, it is possible that at these higher CSF' values where lipid extraction is efficient, extensive cell wall disruption has occurred.…”

Section: )] −mentioning

confidence: 86%

“…Sulfuric acid is most commonly used for acid pretreatment due to its low cost and efficiency. Other acids such as nitric acid have also been tested, but significant reduction in the yield has been observed at higher acid concentrations (Lee et al, 2014;Lee and Han, 2015b). This is probably a result of the nitric acid's oxidative action that would degrade the released molecules.…”

Section: Acid Treatmentmentioning

confidence: 99%

Current and novel approaches to downstream processing of microalgae: A review

Nitsos

Filali

Taidi

et al. 2020

Biotechnology Advances

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Hydrothermal nitric acid treatment for effectual lipid extraction from wet microalgae biomass

Cited by 30 publications

References 28 publications

High-value biomass from microalgae production platforms: strategies and progress based on carbon metabolism and energy conversion

High-value biomass from microalgae production platforms: strategies and progress based on carbon metabolism and energy conversion

Cell disruption technologies

Current and novel approaches to downstream processing of microalgae: A review

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