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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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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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Exopolysaccharides from microalgae: production, characterization, optimization and techno-economic assessment.

Anıl Tevfik Koçer1, Benan İnan2, Sedef Kaptan Usul3

  • 1Department of Bioengineering, Yıldız Technical University, Istanbul, Turkey.

Brazilian Journal of Microbiology : [Publication of the Brazilian Society for Microbiology]
|September 12, 2021
PubMed
Summary

This study explored exopolysaccharide (EPS) production in microalgae, finding Chlorella minutissima to be the most productive species. Optimal conditions showed an inverse relationship between EPS yield and cultivation parameters like light and nutrient levels.

Keywords:
BioprocessBotryococcus brauniiChlorella minutissimaChlorella sorokinianaExopolysaccharideMicroalgae

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Area of Science:

  • Biotechnology
  • Microalgal Cultivation
  • Biopolymer Production

Background:

  • Microalgae are gaining attention for exopolysaccharide (EPS) production due to their hydrocarbon biosynthesis capabilities.
  • Exopolysaccharides are complex carbohydrate polymers secreted by microorganisms.

Purpose of the Study:

  • To evaluate the exopolysaccharide production potential of different microalgae species.
  • To analyze the impact of carbon, nitrogen, and illumination on EPS yield.
  • To conduct a techno-economic assessment of the most efficient microalgal EPS bioprocess.

Main Methods:

  • Cultivation of Chlorella minutissima, Chlorella sorokiniana, and Botryococcus braunii for EPS extraction.
  • Statistical analysis using Box-Behnken experimental design to optimize cultivation parameters.
  • Techno-economic assessment of the microalgal EPS bioprocess.

Main Results:

  • Chlorella minutissima yielded the highest EPS at 0.245 g/L, followed by Chlorella sorokiniana (0.163 g/L) and Botryococcus braunii (0.117 g/L).
  • Exopolysaccharide production showed an inverse correlation with increased illumination time and higher carbon and nitrogen concentrations in the growth medium.
  • The techno-economic assessment indicated the bioprocess is economically viable, with potential for improvement via a biorefinery approach.

Conclusions:

  • Chlorella minutissima is a promising candidate for efficient exopolysaccharide production.
  • Optimizing cultivation conditions, particularly light and nutrient levels, is crucial for maximizing EPS yield.
  • The microalgal EPS bioprocess demonstrates economic feasibility and suggests future development through biorefinery strategies.