Photoautotrophic Polyhydroxyalkanoate Production in Cyanobacteria
Ka-Kei Sam, Nyok-Sean Lau, Amirul Al-Ashraf Abdullah and Minami Matsui
from: Cyanobacteria: Omics and Manipulation (Edited by: Dmitry A. Los). Caister Academic Press, U.K. (2017) Pages: 235-252.
Accumulation of recalcitrant plastics waste in the natural environment leading to environmental problems and still unresolved plastic litter issues are of significant environmental concern. Development and production of biobased and biodegradable plastics including polyhydroxyalkanoate (PHA) are rapidly expanding because these bioplastics can serve as alternatives for petrochemical based polymers. Industrial-scale PHA production currently depends on a fermentation process using heterotrophic bacteria. Economic competitiveness of this production process is limited by the cost of carbon feedstock. It is therefore desirable to develop production platforms based on carbon-neutral PHA producers with capability to fix atmospheric carbon dioxide by which carbon feedstock can be omitted, and at the same time reduce carbon dioxide emissions. Throughout this chapter, potentials of photosynthetic cyanobacteria as hosts for sustainable PHA production from renewable sunlight and atmospheric carbon dioxide are discussed. Some future trends for improving PHA productivity in photosynthetic cyanobacteria are also briefly described read more ...