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Molecular‐Level Insights Into Solvent‐Dependent Interactions Governing the Solubility of Polyhydroxyalkanoates
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Scientists used computer modeling to understand exactly how a biodegradable plastic alternative (called PHA) dissolves and interacts with different solvents at the molecular level. This matters because PHA plastics break down naturally without leaving behind the harmful residues linked to microplastic pollution, and this research could help engineers design better, more sustainable PHA products to replace conventional plastics in packaging and other everyday items. While this is early-stage chemistry research rather than a human health study, it supports progress toward reducing plastic waste that can affect our food, water, and bodies.
ABSTRACT Polyhydroxyalkanoates (PHA) are biodegradable alternatives to conventional plastics, as they can decompose without generating harmful residues, thereby addressing global plastic pollution. In this work, a molecular‐level understanding of solvent‐polymer interactions is achieved using Density Functional Theory (DFT). The molecules were optimized at the M06‐2X/cc‐pVDZ level, and the binding energies (−8.45 to −18.89 kcal/mol) confirm the thermodynamic stability of the complexes and are consistent with experimental solubility patterns. Non‐Covalent Interaction (NCI) and Reduced Density Gradient (RDG) analyses demonstrate that the van der Waals interactions dominate with minor contributions from hydrogen bonding. Natural Bond Orbital (NBO) analysis highlights the donor‐acceptor interactions with stabilization energies up to ∼17 kcal/mol, while Quantum Theory of Atoms in Molecules (QTAIM) suggests their predominantly closed‐shell interactions. Frontier Molecular Orbital (FMO) and Molecular Electrostatic Potential (MESP) analyses further explain the charge transfer and key interaction sites. Thus, this study provides a molecular‐level understanding of solvent‐PHA interactions for the rational design of sustainable PHA‐based materials.
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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.
PHA-Based Bioplastic: a Potential Alternative to Address Microplastic Pollution
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This review examines polyhydroxyalkanoate (PHA)-based bioplastics as biodegradable alternatives to petroleum-derived plastics, highlighting their potential to reduce microplastic pollution while discussing challenges in scaling production and improving material properties.
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.
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
Comparative In Silico Structural Analysis of PHA Synthases from Industrially Prominent PHA Producers
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This study used computational (in silico) methods to analyze the 3D structures of PHA synthase enzymes — the biological catalysts responsible for producing polyhydroxyalkanoates, a class of biodegradable bioplastics. By comparing enzyme structures across four bacterial genera, the researchers identified structural similarities and differences that could guide the engineering of more efficient bioplastic-producing microbes. While not directly about microplastic pollution, this work advances the development of biodegradable alternatives that could reduce plastic waste at the source.
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