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Biofuels01:25

Biofuels

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...

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Analysis of Fatty Acid Content and Composition in Microalgae
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A New Protocol Using Acidification for Preserving DMSP in Macroalgae and Comparison with Existing Protocols.

Eva Bucciarelli1, Valérie Stiger-Pouvreau1, Solène Connan1

  • 1Univ Brest, CNRS, IRD, Ifremer, LEMAR, F-29280 Plouzane, France.

Journal of Phycology
|December 9, 2020
PubMed
Summary

Acidification preserves dimethylsulfoniopropionate (DMSP) in macroalgae for months, unlike drying or freezing. This method ensures accurate DMSP measurements in marine algae samples over extended storage periods.

Keywords:
DMSPacidificationdryingfreezingmacroalgaestorage protocol

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Area of Science:

  • Marine Biology
  • Chemical Oceanography
  • Phycology

Background:

  • Dimethylsulfoniopropionate (DMSP) is crucial for macroalgae physiology and ecology.
  • Standard DMSP measurement involves dimethylsulfide (DMS) production via NaOH hydrolysis, but DMS storage is limited to one week.

Purpose of the Study:

  • To evaluate acidification as a long-term preservation method for DMSP in macroalgal samples.
  • To compare the efficacy of acidification against drying and freezing for DMSP content analysis over three months.

Main Methods:

  • Macroalgal samples (green, red, brown) were analyzed for DMSP content after NaOH hydrolysis.
  • Fresh samples were treated with 0.2 mol·L⁻¹ HCl for 24 hours before NaOH hydrolysis.
  • DMSP content was compared after 3-month storage using acidification, drying (60°C), or freezing (-20°C).

Main Results:

  • Acidification maintained DMSP content accurately for up to three months.
  • Drying at 60°C resulted in 75-98% DMSP loss.
  • Freezing at -20°C led to a 37-80% DMSP loss over three months.

Conclusions:

  • Acidification is a reliable and effective method for preserving DMSP in macroalgal samples for long-term storage.
  • Acidification offers a superior alternative to drying and freezing for maintaining DMSP integrity for accurate analysis.