In a recent review published in the journal npj Materials Sustainability, lead author Yasaman Esmaeili and a team of researchers from Deakin University explore the transformative potential of turning organic waste into next-generation bioplastics. The study focuses on polyhydroxyalkanoates, commonly known as PHAs, which are natural polyesters produced by various microorganisms as a way to store energy. Unlike traditional plastics made from petroleum, these materials are fully biodegradable in both soil and marine environments. This characteristic makes them a vital tool for addressing the global plastic pollution crisis while reducing the carbon footprint of the materials we use every day.

The researchers highlight a significant shift in how these bioplastics are produced, moving away from expensive food-based sugars like corn and sugarcane toward abundant organic residues. Agricultural waste, such as wheat straw and rice husks, as well as industrial by-products like used cooking oil and wastewater sludge, serve as excellent carbon sources for the bacteria that build these polymers. For instance, using waste cooking oil can actually lead to better polymer accumulation than fresh oil because the partially degraded fats are easier for bacteria to digest. This approach not only lowers the cost of raw materials by more than fifty percent but also supports a circular economy where waste is treated as a valuable resource rather than a burden.

One of the most exciting aspects of this research is the integration of artificial intelligence and machine learning into the manufacturing process. The study describes how AI models can predict the thermal and mechanical properties of different plastic formulations before they are even made in the lab. These data-driven tools help scientists fine-tune the growth conditions of the microbes, leading to a massive increase in productivity. In some cases, using genetic algorithms to optimize the feeding of these bacteria resulted in PHA yields reaching over seventy-seven percent of the total cell weight. This level of precision allows for the creation of customized plastics that have the high tensile strength needed for food packaging or the flexibility required for medical devices.

The review also addresses the critical challenge of extracting the plastic from the bacterial cells in an eco-friendly way. Traditional methods often rely on toxic solvents like chloroform, which are harmful to human health and the environment. The researchers showcase green alternatives, such as using simple alkaline solutions like sodium hydroxide or mechanical methods like high-pressure homogenization. These green extraction techniques have shown the ability to recover up to ninety-five percent of the accumulated plastic with high purity while preserving the quality of the polymer chains. By avoiding hazardous chemicals, these processes ensure that the entire lifecycle of the bioplastic remains sustainable and safe for industrial-scale use.

Finally, the study emphasizes the importance of intelligent end-of-life design. By understanding the specific pathways through which PHAs degrade, such as through microbial activity or exposure to light and heat, scientists can engineer materials to break down at a predictable rate. AI is once again playing a role here by helping discover new enzymes that can accelerate the breakdown of plastics in composting facilities. This ensures that when a PHA-based bottle or bag is discarded, it returns to the earth as energy and biomassBiomass is a complex biological organic or non-organic solid product derived from living or recently living organism and available naturally. Various types of wastes such as animal manure, waste paper, sludge and many industrial wastes are also treated as biomass because like natural biomass these More without leaving behind microplastics. This comprehensive view of the plastic lifecycle—from waste feedstockFeedstock refers to the raw organic material used to produce biochar. This can include a wide range of materials, such as wood chips, agricultural residues, and animal manure. More to a natural finish—marks a major step toward a world where our materials work in harmony with nature.

Source: Esmaeili, Y., Timms, W., Barrow, C. J., Naebe, M., & Jafarzadeh, S. (2026). Organic wastes to next-generation bioplastics through intelligent biomanufacturing of polyhydroxyalkanoates. npj Materials Sustainability, 4(22), 1-14.