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Environmental biodegradability of recombinant structural protein.
Yuya Tachibana1,2, Sunita Darbe3, Senri Hayashi4
1Division of Molecular Science, Faculty of Science and Technology, Gunma University, 1-5-1 Tenjin, Kiryu, Gunma, 376-8515, Japan. tachibana@gunma-u.ac.jp.
Scientific Reports
|January 9, 2021
Summary
Recombinant structural protein BP1 offers a sustainable alternative to plastics, exhibiting excellent thermal and mechanical properties. This biodegradable polymer shows significant potential for eco-friendly material applications.
Area of Science:
- Materials Science
- Biotechnology
- Polymer Chemistry
Background:
- Next-generation polymers require renewable sourcing and environmental degradability.
- Recombinant structural proteins offer a promising alternative to conventional plastics.
- BP1, a recombinant structural protein, is explored for its material properties and biodegradability.
Purpose of the Study:
- To measure the thermal and mechanical properties of recombinant structural protein BP1.
- To evaluate the biodegradability of BP1 under various conditions.
- To compare BP1's properties with existing biodegradable polymers.
Main Methods:
- Thermal analysis (degradation temperature, glass transition temperature).
- Mechanical testing (flexural strength, flexural modulus).
- Biodegradability assessment (hydrolysis by bacteria and proteases, biochemical oxygen demand (BOD) testing).
Main Results:
- BP1 exhibits thermal degradation above 250°C and a glass transition temperature of 185°C.
- BP1 can be hot-pressed into sheets at 150°C and 83 MPa.
- Flexural strength (115±6 MPa) and modulus (7.38±0.03 GPa) surpass commercial biodegradable polymers.
- BP1 demonstrates efficient hydrolysis by bacterial strains and proteases.
- Biochemical oxygen demand (BOD) biodegradability reached 70.2±6.0% over 33 days.
Conclusions:
- BP1 possesses favorable thermal and mechanical properties suitable for processing.
- BP1 exhibits significant biodegradability through hydrolysis and mineralization.
- BP1 represents a viable, high-performance, and biodegradable alternative to conventional plastics.
