Study on the conversion of wool keratin by steam explosion

Area of Science:

• Materials Science
• Biochemistry
• Sustainable Chemistry

Background:

• Keratin-based wastes, such as wool fibers, represent a significant source of underutilized protein.
• Developing eco-friendly methods for keratin waste valorization is crucial for sustainable industrial practices.

Purpose of the Study:

• To investigate the chemical-free steam explosion method for processing wool keratin.
• To assess the feasibility of exploiting keratin-based waste through this method.

Main Methods:

• Wool fiber samples were treated using steam explosion without chemical additives.
• Phase separation techniques including filtration, centrifugation, and precipitation were employed.
• Characterization of the resulting products was performed to analyze structural and molecular changes.

Main Results:

• Steam explosion converted wool keratin into a dark-yellow sludge.
• Phase separation yielded water-soluble peptides and free amino acids.
• Significant disruption of the histological structure and reduction in molecular weight were observed.
• Disulfide bonds were broken, and the high-sulfur protein fraction decomposed.

Conclusions:

• Chemical-free steam explosion is an effective method for breaking down wool keratin.
• The process generates valuable water-soluble peptides and amino acids from waste wool.
• This approach offers a sustainable pathway for the valorization of keratin-based industrial and farm wastes.