Seaweed processing using industrial single-mode cavity microwave heating: a preliminary investigation.

Area of Science:

• Marine Biotechnology
• Chemical Engineering
• Food Science

Background:

• Carrageenans are valuable hydrocolloids extracted from red seaweed.
• Traditional extraction methods are often time-consuming and solvent-intensive.
• Efficient and sustainable extraction techniques are needed.

Purpose of the Study:

• To design and fabricate a single-cavity microwave heating system for seaweed carrageenan extraction.
• To evaluate the efficiency and product quality of microwave-assisted extraction (MAE).
• To compare MAE with conventional methods in terms of time and solvent consumption.

Main Methods:

• A single-mode (TE101) waveguide microwave system with integrated power and temperature controls was developed.
• A continuous-flow-recycle reactor operating at atmospheric pressure was employed.
• Extraction of E. cottonii and E. spinosum was performed using aqueous organic solvents.

Main Results:

• The microwave heating system successfully extracted carrageenans from seaweed.
• Fourier-transform infrared (FTIR) and nuclear magnetic resonance (NMR) spectra of extracted products were comparable to reference kappa- and iota-carrageenan.
• Extraction time was substantially reduced, and organic solvent consumption was minimized.

Conclusions:

• The developed microwave heating system offers an efficient method for carrageenan extraction.
• MAE provides a faster and more sustainable alternative to traditional carrageenan extraction techniques.
• The system yields high-purity carrageenan suitable for industrial applications.