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Solvent extraction and analytical characterization of polyhydroxyalkanoate inclusions produced by the microeukaryote Paramecium jenningsi
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Scientists discovered that a single-celled pond organism called Paramecium can produce biodegradable plastic-like compounds inside its own cells, something previously seen mainly in bacteria. While this research doesn't directly address human health, finding new biological sources for biodegradable plastics matters because it could eventually help reduce our reliance on petroleum-based plastics, the breakdown products of which (microplastics) have raised health concerns from contaminating our food, water, and even our bodies.
The increasing global burden of petroleum-derived plastic pollution has intensified the search for sustainable and biodegradable alternatives to conventional plastics. Polyhydroxyalkanoates (PHAs) are biodegradable microbial polyesters with considerable potential to replace petroleum-based plastics; however, research has predominantly focused on bacterial production systems, while microeukaryotic microorganisms remain largely unexplored. In this study, the ciliated protozoan Paramecium jenningsi, isolated from stagnant freshwater, was investigated as a microeukaryotic platform for PHA biosynthesis. Growth conditions were optimized using Bold Basal Medium (BBM), and intracellular PHA accumulation was initially screened using Sudan Black B and Nile Blue A staining. PHA production was induced under glucose-enriched and HgSO₄-stressed conditions, and polymers were extracted after 24, 48, and 72 h of exposure. The highest polymer yield (0.36 g/L) was obtained from glucose-treated cultures after 24 h, significantly exceeding that of HgSO₄-treated and control cultures. The recovered polymers were characterized using Fourier-transform infrared spectroscopy (FTIR) and gas chromatography-mass spectrometry (GC-MS). FTIR analysis revealed characteristic functional groups associated with PHAs, while GC-MS detected prominent 2-butenoic acid ester derivatives indicative of polyhydroxybutyrate (PHB)-related polymers. Notably, GC-MS also revealed medium- and long-chain-length hydroxyalkanoate monomers (C4-C19) alongside the short-chain-length PHB-associated derivatives, indicating that P. jenningsi produces a structurally heterogeneous PHA copolymer rather than PHB alone. These findings demonstrate the ability of P. jenningsi to accumulate PHB-like biopolymers under both carbon-rich and metal-stressed conditions and provide the first evidence supporting this species as a potential microeukaryotic host for PHA production. The study expands the diversity of microbial systems available for biopolymer research and highlights the potential of protozoan platforms for sustainable bioplastic development.
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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
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Scientists studying ocean plastic found that microbial communities growing on it are shaped mainly by when and where the plastic enters the water, not the type of plastic itself. They also spotted a possible parasite linked to diatoms (tiny algae vital to ocean food chains) living on these plastics, raising questions about how growing plastic pollution might disrupt marine ecosystems that humans rely on for food and oxygen.
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