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Marine biodegradation of tailor-made polyhydroxyalkanoates (PHA) influenced by the chemical structure and associated bacterial communities
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Scientists tested how well different types of "biodegradable" bioplastics (called PHAs) actually break down in ocean water, and found that both the plastic's chemical makeup and the specific bacteria living on it determine how fast it disappears. This matters because not all biodegradable plastics break down at the same rate in nature, so knowing which formulas degrade best could help reduce ocean plastic pollution and the microplastics that eventually end up in our food and water.
Over recent years, biodegradable polymers have been proposed to reduce environmental impacts of plastics for specific applications. The production of polyhydroxyalkanoates (PHA) by using diverse carbon sources provides further benefits for the sustainable development of biodegradable plastics. Here, we present the first study evaluating the impact of physical, chemical and biological factors driving the biodegradability of various tailor-made PHAs in the marine environment. Our multidisciplinary approach demonstrated that the chemical structure of the polymer (i.e. the side chain size for short- vs. medium-chain PHA) which was intrinsically correlated to the physico-chemical properties, together with the specificity of the biofilm growing on plastic films (i.e., the associated 'plastisphere') were the main drivers of the PHA biodegradation in the marine environment.
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Biodegradability of polyhydroxyalkanoate (PHA) biopolyesters in nature: a review
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This comprehensive review examined the biodegradation of polyhydroxyalkanoates (PHA) biopolyesters in fresh water, sea water, soil, and composting and anaerobic conditions, comparing how monomer composition and microstructure influence biodegradation rates across environments. The review synthesized information from over 150 identified PHA building blocks, arguing that PHA's natural circularity via microbial enzymatic biodegradation and production from renewable carbon sources positions it as a gold standard sustainable alternative to fossil-based plastics.
Marine biodegradation of plastic films by Alcanivorax under various ambient temperatures: Bacterial enrichment, morphology alteration, and release of degradation products
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Scientists tested how ocean bacteria break down different types of plastic films at various water temperatures, finding that bio-based plastics (PHA) degraded much faster than conventional plastics (LDPE) and even other biodegradable plastics (PLA). Warmer water temperatures accelerated the breakdown process, though even in cold water some degradation occurred. While biodegradable plastics do break down in the ocean, the process releases smaller particles and chemical byproducts that could still pose environmental risks.
Comparative Genomics of Marine Bacteria from a Historically Defined Plastic Biodegradation Consortium with the Capacity to Biodegrade Polyhydroxyalkanoates
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Researchers conducted comparative genomics of marine bacteria from a plastic biodegradation consortium, finding that multiple strains had the genomic capacity to biodegrade polyhydroxyalkanoate (PHA) bioplastics, with implications for understanding microbial degradation of biodegradable plastic alternatives.
Marine biodegradation mechanism of biodegradable plastics revealed by plastisphere analysis
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Researchers analyzed the marine biodegradation mechanisms of two biodegradable plastics, PHBV and PBSA, by examining plastisphere functional gene assemblages, finding that differences in microbial community composition on their surfaces help explain why these polyesters degrade at substantially different rates in seawater.
Half-life of biodegradable plastics in the marine environment depends on material, habitat, and climate zone
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This study compared the biodegradation rates of three types of biodegradable plastics (PHA, PBSe, PBSeT) versus conventional polyethylene under realistic marine conditions. Results showed that PHA degraded rapidly at sea while the others performed poorly, highlighting that not all "biodegradable" plastics actually break down quickly in marine environments.
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