Biological conversion of methane to polyhydroxyalkanoates: Current advances, challenges, and perspectives

Area of Science:

• Biotechnology
• Polymer Science
• Environmental Science

Background:

• Methane emissions and plastic pollution represent significant global environmental challenges.
• Poly-β-hydroxybutyrate (PHB) is a biodegradable polymer with potential to replace petroleum-based plastics.
• Biological conversion of methane to PHB offers a dual solution for emission mitigation and sustainable material production.

Purpose of the Study:

• To provide an overview of recent advances in methane-based poly-β-hydroxybutyrate (PHB) production.
• To discuss the challenges associated with methane-based PHB synthesis.
• To explore strategies for overcoming production limitations and improving material properties.

Main Methods:

• Review of PHB biosynthetic pathways and the role of methanotrophs.
• Analysis of various bioreactor configurations for methane conversion.
• Examination of strategies including feast-famine regimes and engineered microorganisms.
• Investigation of methods for enhancing PHB material properties, such as co-synthesis and molecular weight manipulation.

Main Results:

• Recent advances in PHB biosynthesis, methanotroph utilization, and bioreactor technologies have been detailed.
• Key challenges identified include low methanotroph efficiency, inefficient gas-liquid mass transfer, and suboptimal material characteristics.
• Various strategies show promise for enhancing production efficiency and tailoring PHB properties.

Conclusions:

• Methane-based PHB production presents a viable route for sustainable biopolymer generation.
• Addressing challenges in microbial efficiency, mass transfer, and material properties is crucial for industrial scalability.
• Continued research into engineered microbes and advanced bioreactor designs will drive progress in this field.