Extraction of Protein from Four Different Seaweeds Using Three Different Physical Pre-Treatment Strategies

Area of Science:

• Marine Biology
• Biotechnology
• Food Science

Background:

• Seaweeds are a valuable protein source, containing up to 47% protein by dry weight.
• Extracting seaweed protein is difficult due to complex cell wall structures.
• Understanding optimal extraction methods is crucial for utilizing seaweed resources.

Purpose of the Study:

• To evaluate the effectiveness of different protein extraction methods on various seaweed species.
• To quantify protein, ash, and lipid yields from treated macroalgae.
• To determine if extraction efficiency is species-dependent.

Main Methods:

• Four macroalgae species (two brown, two red) were subjected to three treatments: high-pressure processing (HPP), laboratory autoclave, and a classical sonication/salting out method.
• Protein, ash, and lipid content were analyzed in the resulting extracts.
• Protein recovery yields were calculated for each species and treatment combination.

Main Results:

• Protein yields varied significantly across species and treatments, ranging from 3.2% (Fucus vesiculosus with HPP) to 28.9% (Chondrus crispus with classical method).
• The classical sonication and salting out method generally yielded higher protein recovery for Chondrus crispus (35.2%).
• High-pressure processing (HPP) showed variable results, with Fucus vesiculosus yielding 23.7% and Palmaria palmata yielding 14.9%.

Conclusions:

• Macroalgal protein extraction efficiency is highly dependent on the specific seaweed species and the chosen extraction technique.
• Physical and enzymatic methods can be employed, but optimization for individual species is essential for maximizing protein recovery.
• Further research into tailored extraction strategies can unlock the full potential of seaweed as a protein source.