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Ethanol-water extraction yielded the most biomass from Arthrospira platensis and Ascophyllum nodosum, supporting sustainable marine biorefinery design. This method efficiently extracts diverse compounds from microalgae and macroalgae.

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Area of Science:

  • Marine biotechnology and sustainable resource utilization.
  • Phycology and algal biomass processing.
  • Green chemistry and solvent-based extraction techniques.

Background:

  • Marine microalgae (Arthrospira platensis) and macroalgae (Ascophyllum nodosum) are valuable biomass resources.
  • Efficient extraction methods are crucial for developing sustainable marine biorefineries.
  • Solvent choice significantly impacts extraction yield and compound profile.

Purpose of the Study:

  • To evaluate solvent-dependent extraction of Arthrospira platensis and Ascophyllum nodosum.
  • To guide the design of sustainable marine biorefineries.
  • To compare extraction yields and chemical profiles using different solvents.

Main Methods:

  • Rapid extractions using SOXTHERM with n-hexane, ethanol-water (1:1, v/v), and water.
  • Controlled extraction severity (3 h, n=2).
  • Analysis of extract composition using ultra-high-resolution FT-ICR-MS.

Main Results:

  • Ethanol-water consistently yielded the highest biomass for both A. platensis (25% DW) and A. nodosum (26% DW).
  • Hexane enriched lipophilic fractions, water favored polar constituents, and ethanol-water provided a broad spectrum.
  • A. platensis extracts were protein and polyunsaturated fatty acid-rich; A. nodosum extracts were mineral and carbohydrate-rich.

Conclusions:

  • Ethanol-water is recommended for broad compositional analysis and initial scouting in marine biorefineries.
  • Specific solvent strategies are needed for targeted compound isolation from microalgae and macroalgae.
  • Process optimization requires addressing challenges like desalting and foam mitigation in polar extractions.