Sequential Extraction of Valuable Bio-Products from Snow Crab (Chionoecetes opilio) Processing Discards Using...

Area of Science:

• Biotechnology
• Green Chemistry
• Sustainable Resource Management

Background:

• Crab processing discards represent a significant waste stream.
• Valorization of seafood waste is crucial for sustainable aquaculture and fisheries.
• Current extraction methods often rely on hazardous chemicals and energy-intensive processes.

Purpose of the Study:

• To develop and evaluate green extraction methods for sequential recovery of carotenoids, protein, and chitin from crab processing discards.
• To minimize or eliminate the use of hazardous chemical solvents.
• To create simple, implementable processes for industrial application.

Main Methods:

• Combined mechanical, enzymatic, and green chemical treatments for sequential extraction.
• Carotenoid extraction using vegetable oils (corn, canola, sunflower).
• Demineralization with citric acid for protein extraction.
• Deproteination with proteases for chitin isolation.
• Decolorization attempts using hydrogen peroxide.
• Characterization of bio-products, including X-ray diffraction for chitin crystallinity.

Main Results:

• Successful sequential extraction of three valuable crab bio-products: pigmented vegetable oil, pigmented protein powder, and chitin.
• Astaxanthin recovery ranged from 24.85% to 37.93% using vegetable oils.
• Chitin was isolated with yields between 17.06% and 19.15%.
• Green methods achieved an 80.18% crystallinity index (CI) for chitin.

Conclusions:

• Valuable bio-products (carotenoids, protein, chitin) can be efficiently recovered from crab waste using green extraction techniques.
• The developed methods are simple and avoid hazardous chemicals, making them suitable for industrial implementation.
• Further research is necessary to achieve pigment-free chitin through environmentally friendly decolorization processes.