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Closing the loop on plastics: Biological and hybrid routes for converting plastic waste to polyhydroxyalkanoates.
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Scientists are exploring how to turn plastic waste into biodegradable plastic using bacteria, essentially recycling trash into a safer material that breaks down naturally instead of piling up in landfills or oceans. This review pulls together existing research on the process, highlighting that while promising, the technology still faces hurdles like breaking down plastic efficiently and scaling it up affordably. If perfected, this approach could reduce the amount of plastic waste that degrades into microplastics, which have been found in human blood, organs, and even breast milk, raising ongoing health concerns.
Polyhydroxyalkanoate (PHA) production from plastic-derived substrates offers a promising route to mitigate plastic pollution while reducing dependence on conventional PHA feedstocks. Plastic waste represents an abundant carbon source for microbial fermentation, but efficient conversion remains limited by incomplete deconstruction, inhibitory intermediates, low carbon recovery, and challenges in process integration. Plastic-derived streams contain diverse compounds, including fatty acids, hydrocarbons, fatty alcohols, aldehydes, esters, and aromatic compounds generated during depolymerization. These intermediates can be metabolized by selected microorganisms, particularly Pseudomonas species with versatile fatty-acid and hydrocarbon pathways, as well as Cupriavidus necator and mixed microbial cultures. Unlike reviews that address plastic upcycling or PHA biosynthesis separately, this review focuses on the deconstruction-fermentation interface that governs plastic-to-PHA conversion. It consolidates current progress in plastic deconstruction, substrate conditioning, microbial metabolism, fermentation control, polymer recovery, and techno-economic and life-cycle considerations. By emphasizing substrate composition, biological compatibility, plastic‑carbon recovery, and final polymer quality, the review identifies priorities for scalable and environmentally sustainable PHA production from plastic-derived substrates.
More Papers Like This
What Is New in the Field of Industrial Wastes Conversion into Polyhydroxyalkanoates by Bacteria?
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This review covers recent advances in using bacteria to convert industrial food waste into polyhydroxyalkanoates (PHAs), a type of biodegradable bioplastic. Using industrial waste as feedstock for bioplastic production could reduce both plastic pollution and food industry waste simultaneously.
Emerging Technologies for Converting Mixed Plastic Waste into Biodegradable Polymers
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Scientists are developing new ways to turn mixed plastic waste (like food containers and shopping bags) into biodegradable materials that naturally break down instead of polluting the environment. This research review summarizes promising techniques that could help reduce the microplastics that end up in our food and water. If these methods can be made affordable and used widely, they could significantly cut plastic pollution and the health risks it poses to humans.
Polyhydroxyalkanoate as Next Generation Bioplastics for Sustainability and Circular Energy Management
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This review summarizes research on turning wastewater sludge, a leftover from treating dirty water, into biodegradable plastic instead of regular fossil fuel based plastic. Since regular plastics break down into microplastics that can end up in our food and bodies, using this cleaner alternative could cut plastic pollution while also lowering climate warming emissions.
Polyhydroxyalkanoates as multifaceted biopolymers: an eco-friendly alternative to conventional plastics.
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Plastic pollution and the microplastics it creates are a growing health concern, but this review paper looks at a promising fix: plastics made by bacteria instead of fossil fuels, called PHAs, which naturally break down without leaving lasting waste. The researchers summarize existing studies on how to grow and produce these bacteria-made plastics more efficiently and affordably, since high costs are still the main reason they haven't replaced regular plastic on store shelves. While PHAs aren't widely available yet, this research maps out what's needed to make them a real, scalable alternative that could reduce our exposure to plastic waste in the environment
Bioplastics against Microplastics: Screening of Environmental Bacteria for Bioplastics Production
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Researchers screened environmental bacteria for their ability to produce polyhydroxyalkanoate bioplastics, which are biodegradable alternatives to conventional petroleum-based plastics. Developing efficient bioplastic-producing strains is one strategy to reduce the long-term accumulation of persistent microplastics in the environment.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.