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Green Algae01:21

Green Algae

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Green algae, also referred to as chlorophytes, are different from red algae in having the chloroplasts containing chlorophylls a and b, which give them their distinct green hue. However, they lack phycobiliproteins, preventing them from developing the red or blue-green pigmentation seen in red algae. In terms of photosynthetic pigment composition, green algae closely resemble plants and share a close evolutionary relationship with them. Taxonomically Green algae belong to Phylum Chlorophyta in...
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Red algae, also known as rhodophytes, are primarily found in marine environments, though some species inhabit freshwater and terrestrial ecosystems. These organisms exist in both unicellular and multicellular forms, with some multicellular varieties reaching macroscopic sizes.As phototrophic organisms, red algae contain chlorophyll a; however, their chloroplasts lack chlorophyll b. Instead, they possess phycobiliproteins, which serve as major light-harvesting pigments, similar to those found in...
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The kingdom Archaeplastida encompasses red and green algae, along with land plants. Unlike other protists with chloroplasts that arose through secondary endosymbiosis, only red and green algae originated from primary endosymbiotic events. This diverse group of eukaryotic organisms contains chlorophyll and performs oxygenic photosynthesis.Algae exist in various forms, from large brown kelp in coastal waters to green scum in puddles and stains on rocks or soil. Some species are responsible for...
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The group Stramenopiles include some phototrophic microorganisms. Members of this group possess flagella covered in numerous short, hairlike extensions, a feature that inspired the group's name, derived from the Latin words for "straw" and "hair." Some of the main categories of Stramenopiles include diatoms, golden algae, and brown algae.Diatoms are unicellular, photosynthetic eukaryotes, with over 200 known genera. They play a key role in the planktonic communities of both marine and...
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Triglycerides serve as crucial long-term energy storage molecules in microorganisms, providing a dense source of metabolic energy. Their breakdown is mediated by lipases, which hydrolyze triglycerides into glycerol and free fatty acids. Each of these components follows distinct metabolic pathways, ultimately contributing to ATP synthesis and cellular energy homeostasis.Glycerol MetabolismGlycerol, released from triglyceride hydrolysis, is phosphorylated by glycerol kinase to form...
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Analysis of Fatty Acid Content and Composition in Microalgae
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Towards microalgal triglycerides in the commodity markets.

Giulia Benvenuti1, Jesús Ruiz2, Packo P Lamers1

  • 1Bioprocess Engineering, AlgaePARC, Wageningen University, P.O. Box 16, 6700 AA Wageningen, The Netherlands.

Biotechnology for Biofuels
|July 21, 2017
PubMed
Summary

Techno-economic analysis shows microalgal triglyceride (TAG) production costs can be halved. Key improvements include enhanced photosynthetic efficiency and reduced cooling needs for sustainable feedstock development.

Keywords:
MicroalgaeProduction costsTechno-economic analysisTriglyceride production

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Area of Science:

  • Biotechnology
  • Renewable Energy
  • Chemical Engineering

Background:

  • Microalgal triglycerides (TAGs) are a promising sustainable feedstock for industries.
  • Techno-economic studies are crucial for research prioritization and business decisions.
  • This study analyzes a two-step TAG production process for a 100-ha plant in southern Spain.

Purpose of the Study:

  • To conduct a techno-economic analysis of microalgal TAG production.
  • To identify key parameters for reducing production costs.
  • To establish a roadmap for cost-effective microalgal biomass production.

Main Methods:

  • Utilized a two-step TAG production model with continuous growth and batch stress reactors.
  • Established a base case using outdoor pilot-scale data and current technology.
  • Simulated various scenarios based on biological and technological advancements.

Main Results:

  • Base case production cost is 6.7 €/kg biomass (24% TAG).
  • Increasing photosynthetic efficiency offers the most significant cost reduction (30-14%).
  • Reducing cooling requirements can decrease costs by 10-4.5%.

Conclusions:

  • Microalgal TAGs are not yet cost-competitive with current market values.
  • Cost-competitiveness depends on whole biomass valorization and cheaper photobioreactor (PBR) designs.
  • Future research should focus on PBRs that avoid active cooling and utilize water basins for temperature regulation.