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Related Concept Videos

Biofuels01:25

Biofuels

107
The microbial conversion of organic matter into biofuels holds potential as a renewable energy source. Among biofuel sources, microalgae are recognized as a highly efficient and adaptable feedstock for biodiesel production, owing to their rapid biomass accumulation, elevated lipid productivity, and capacity to proliferate in diverse aquatic systems, including freshwater, marine, and wastewater habitats. Unlike terrestrial crops, microalgae do not compete for land and can achieve significantly...
107

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Microalgae Flocculation: Assessment of Extraction Yields and Biological Activity.

Paola Imbimbo1, Alfonso Ferrara1, Enrica Giustino1

  • 1Department of Chemical Sciences, University of Naples Federico II, via Cinthia 4, 80126 Naples, Italy.

International Journal of Molecular Sciences
|October 16, 2024
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Summary

Flocculation using agents like CaCl2 and chitosan offers a cost-effective alternative to centrifugation for microalgae biomass processing. This method preserves carotenoid yield and can enhance antioxidant activity in certain microalgae strains.

Keywords:
antioxidant activityflocculationgreen extractionharvestingindustrial processesmicroalgae

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Area of Science:

  • Biotechnology
  • Phycology
  • Bioprocess Engineering

Background:

  • High downstream processing costs hinder microalgae commercialization.
  • Developing economical and scalable strategies is crucial for widespread microalgae adoption.

Purpose of the Study:

  • To evaluate flocculation as a cost-effective downstream processing method for diverse microalgae strains.
  • To assess the impact of flocculation on carotenoid extraction yield and biological activity.

Main Methods:

  • Tested various flocculants (CaCl2, chitosan) on different microalgae and cyanobacteria strains.
  • Optimized flocculation conditions, including pH adjustment for specific strains.
  • Extracted carotenoids from flocculated biomass and evaluated biological activity (antioxidant).

Main Results:

  • CaCl2 achieved high flocculation rates for green (96%) and red (87%) marine microalgae.
  • Chitosan effectively flocculated cyanobacteria (46%).
  • Flocculation maintained carotenoid yield comparable to centrifugation, especially with wet biomass, and enhanced antioxidant activity in green microalgae extracts.

Conclusions:

  • Flocculation is a viable, cost-effective alternative to centrifugation for microalgae downstream processing.
  • Strain-specific downstream strategies are necessary for optimal microalgae utilization.
  • Flocculation does not negatively impact carotenoid yield and can preserve or enhance biological activity.