Material properties of the cyanobacterial reserve polymer multi-l-arginyl-poly-l-aspartate (cyanophycin)
Autor: | Kristala L. J. Prather, Aditya M. Kunjapur, Weichao Shi, Wui Yarn Chan, Nikita A. Khlystov, Bradley D. Olsen |
---|---|
Rok vydání: | 2017 |
Předmět: |
0301 basic medicine
chemistry.chemical_classification Materials science Polymers and Plastics Cyanophycin Organic Chemistry 02 engineering and technology Polymer engineering.material 021001 nanoscience & nanotechnology Amorphous solid 03 medical and health sciences chemistry.chemical_compound 030104 developmental biology Biochemistry chemistry Chemical engineering Materials Chemistry engineering Thermal stability Biopolymer 0210 nano-technology Glass transition Ionomer Macromolecule |
Zdroj: | Polymer. 109:238-245 |
ISSN: | 0032-3861 |
Popis: | Bio-sourced macromolecules such as cyanophycin are an attractive source for alternative, sustainable plastics. While the chemical structure and biological function of cyanophycin have been previously investigated, its material properties remain largely unexplored. This study investigates the structural, thermal, mechanical, and solution properties of cyanophycin produced from recombinant Escherichia coli . Unplasticized, it has an elastic compression modulus of about 560 MPa and undergoes brittle failure at 78 MPa. Cyanophycin exhibits thermal stability in air up to 200 °C and does not undergo glass transition within its limit of thermal stability. The polypeptide is amorphous and has no long-range ordering in the solid state. In solution, water-soluble cyanophycin is thermoresponsive, exhibiting both upper and lower critical solution temperatures. Because the feasibility of industrial scale cyanophycin production through fermentation has been well studied, an expanded understanding of its materials properties should contribute to the development of new applications for this biopolymer. |
Databáze: | OpenAIRE |
Externí odkaz: |