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Application of freshwater microalgae Scenedesmus sp. for determining the toxicity of polypropylene microplastic particles
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Polypropylene microplastics were found to be toxic to the freshwater microalgae Scenedesmus sp. in a dose-dependent manner. Since microalgae form the base of aquatic food chains, their sensitivity to microplastic exposure has cascading implications for freshwater ecosystems.
Plastika je zbog vrlo dobrih kemijskih i fizikalnih svojstava te isplative cijene doživjela eksponencijalni rast u proizvodnji i primjeni posljednjih 100 godina. No, sve što jednom nastane, neće nestati, stoga sukladno povećanoj proizvodnji nastaju i ogromne količine plastičnog otpada, koji nerijetko završava u okolišu, pogotovo vodenom i to nepravilno zbrinut. Raznim procesima u prirodi, nastaju čestice <5 mm koje se nazivaju mikroplastikom. Toksičan utjecaj tih čestica je dijelom dokazan, ali je veliki dio još uvijek neistražen. U ovome radu provela su se toksikološka ispitivanja utjecaja mikroplastičnih čestica veličina 500-710 μm, 300-500 μm i <300 μm pri koncentracijama od 50 mg/L, 250 mg/L, 500 mg/L, 750 mg/L i 1000 mg/L na inhibiciju rasta mikroalge Scenedesmus sp.. Pratile su se i morfološke promjene. Dobiveni rezultati ukazuju na to da je koncentracija čestica značajni parametar prilikom ispitivanja toksičnosti jer se povećanjem koncentracije jasno uočava i povećana inhibicija rasta. Najveća inhibicija rasta mikroalge Scenedesmus sp., 8,22%, prouzročena je pri najmanjoj veličini čestica, <300 μm, te pri koncentraciji od 750 mg/L. Tijekom pokusa nisu zabilježene značajne morfološke promjene mikroalge.
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Determination of polyethylene microplastics toxicity by microalgae Scenedesmus sp.
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This study investigated the toxicity of polyethylene microplastics on the freshwater microalgae Scenedesmus sp. Results showed that microplastics inhibited algal growth and photosynthesis, indicating potential harm to aquatic ecosystems.
Influence of microplastics particle size on the toxicity of the microalgae Scenedesmus sp.
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This study tested how particle size affects the toxicity of microplastics to freshwater microalgae (Scenedesmus sp.), finding that smaller particles were more toxic. The size-dependent toxicity of microplastics is important for risk assessment, as environmental samples contain particles of widely varying sizes.
Toxic Effects of Microplastics on Culture Scenedesmus quadricauda: Interactions between Microplastics and Algae
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Researchers found that microplastics from multiple polymer types inhibit growth of the freshwater alga Scenedesmus quadricauda and induce oxidative stress, with toxicity varying by polymer type, particle size, and concentration.
Effects of polystyrene nanoplastics on the physiological and biochemical characteristics of microalga Scenedesmus quadricauda
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Polystyrene nanoplastics were found to disrupt the physiology and biochemistry of freshwater microalgae, affecting photosynthesis, growth rates, and oxidative stress markers at environmentally relevant concentrations. The results highlight nanoplastics as a threat to phytoplankton, the base of freshwater food webs.
Effects of polyethylene terephthalate microplastics on cell growth, intracellular products and oxidative stress of Scenedesmus sp.
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Researchers exposed freshwater microalgae to PET microplastics, a common plastic found in beverage bottles and textiles. Higher concentrations of PET particles significantly reduced algal growth and disrupted the cells' internal production of lipids, carbohydrates, and proteins. The study suggests that PET microplastic pollution in wastewater could harm the tiny organisms that form the foundation of aquatic food webs.
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