Effect of different polystyrene nano-plastic concentrations on Chlorella pyrenoidosa

Nigam, Harshita; Jain, Rahul; Pant, Kamal K.; Singh, Vikram

doi:10.1016/j.algal.2022.102835

Cited by 19 publications

(2 citation statements)

References 78 publications

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“…Again, aggregation increases their density and may cause them to settle in the sediment. The exposure of Chlorella pyrenoidosa to 500 nm polystyrene particles increased the secretion of extracellular polymeric substances and resulted in homo-and heteroaggregation by enabling the attachment of particles to algal cells (Nigam et al, 2022). As extracellular polymeric substances are involved in the auto-flocculation of microalgae, enhanced sedimentation of micro-and nanoplastics would be expected along with that of microalgae floc formation (Li et al, 2023).…”

Section: Occurrence and Distribution Of Micro-and Nanoplastics In Fre...mentioning

confidence: 99%

Micro- and nanoplastics in freshwater ecosystems—interaction with and impact upon bacterivorous ciliates

Bulannga,

Schmidt

2024

Front. Earth Sci.

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The ubiquitous occurrence of microplastics and nanoplastics in aquatic environments is of major concern as these priority pollutants are readily ingested by a wide variety of aquatic organisms. Although quantitative data on the interaction of microplastics and even more so on nanoplastics in freshwater environments and their interaction with the aquatic food web are still limited, studies have nevertheless demonstrated that even micro- or nanosized plastic particles can be ingested by various members of the zooplankton functioning as primary consumers. Bacterivorous ciliates are crucial members of the microzooplankton. These fascinating microorganisms are critical components of microbial loops in freshwater environments and are essential links between different trophic levels within the aquatic food web. Ingestion of microscopic plastic particles affects the ciliate cell on a cellular and even on the molecular level. Physical and chemical characteristics such as size, density, and surface properties influence the stability, distribution, retention, transportation, and bioavailability of the microplastic particles for ingestion by ciliates. In turn, the environmental fate of microplastics and nanoplastics can affect their ecotoxicity via surface modifications, such as forming the so-called eco-corona. The consequences of the interaction of ciliates with microplastics and nanoplastics are the potential bioaccumulation of plastic particles through the food web and the possible interference of these emerging pollutants with controlling bacterial and possibly even viral abundance in freshwater environments. Due to the limited data available, studies elucidating the environmental bacterivorous ciliate-micro-/nanoplastics interaction are a priority research topic if we want to holistically assess the environmental fate and ecotoxicity of these pollutants.

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Section: Occurrence and Distribution Of Micro-and Nanoplastics In Fre...mentioning

confidence: 99%

Micro- and nanoplastics in freshwater ecosystems—interaction with and impact upon bacterivorous ciliates

Bulannga,

Schmidt

2024

Front. Earth Sci.

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“…Oxidation-sensitive fluorescent probe, H2DCFDA, was used to analyze intracellular ROS levels according to previously reported publication by Astuya et al (2018), except for washing the cells with phosphate-buffered saline (PBS). PBS is a widely used solution in many biological research applications before fluorescence dye staining since it is isotonic and non-toxic to cells (Tripathi et al, 2015;Jeyakumar et al, 2020;Yan et al, 2021;Nigam et al, 2022). Cells treated with NaOCl and CBZ were harvested, washed twice with PBS (Sigma-Aldrich), and incubated at a final concentration of 5 μMH2DCFDA at 30 °C for 30 min in the dark.…”

Section: Ros-related Redox System 251 Measurement Of Ros Productionmentioning

confidence: 99%

Enhancement of carbamazepine removal rate using Tetradesmus obliquus KNUA061 and NaOCl and utilization of the resulting biomass

Yeo

et al. 2022

Front. Energy Res.

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Pharmaceutical and personal care products (PPCPs) are discharged into receiving water bodies mainly from sewage treatment plants. Due to the inefficient removal in conventional wastewater treatment facilities, PPCPs have become a major concern to aquatic ecosystems, water quality, and public health worldwide since they cause harmful effects on aquatic life and human even at low doses. Among the PPCPs, carbamazepine (CBZ) is one of the most commonly prescribed anticonvulsant drugs and consumed more than 1,000 tons per year. Due to its structural complexity, CBZ is known as recalcitrant compound highly stable during wastewater treatment. Consequently, it has become one of the most frequently detected pharmaceuticals in waste water, surface water, and even drinking water. In this study, Korean indigenous microalgae strains were tested as eco-friendly and cost-effective solutions for CBZ removal. Based on the preliminary biological CBZ degradation tests, Tetradesmus obliquus KNUA061 demonstrating the best CBZ removal rate was selected for further experiments. In order to increase strain KNUA061's CBZ removal efficiency, NaOCl, which is widely accepted in the water purification process, was used as an additional stimulus to induce stress conditions. At around 20 μg L−1 CBZ, addition of 1.0 mg NaOCl resulted in approximately 20% of removal rate increase without suppressing cells growth. Roughly 90% of CBZ remained its original form and the composition of the transformed secondary metabolites was less than 10% during the biodegradation process by the microalga. Based on the results of the antioxidant enzyme activities, degree of lipid oxidation, and amino acid contents, it was concluded that the redox-defence system in microalgal cells may have been activated by the NaOCl treatment. Biomass analysis results showed that higher heating value (HHV) of strain KNUA061 biomass was higher than those of lignocellulosic energy crops suggesting that it could be utilized as a possible renewable energy source. Even though its biodiesel properties were slightly below the international standards due to the high PUFA contents, the biodiesel produced from T. obliquus KNUA061 could be used as a blending resource for transportation fuels. It was also determined that the microalgal biomass has acceptable feasibility as a sustainable dietary supplement feedstock due to its high essential amino acid contents.

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Distinctive toxic repercussions of polystyrene nano plastic towards aquatic non target species Nitrobacter vulgaris, Scenedesmus sp and Daphnia magna

Nagaraja,

Gouda,

Miguez

et al. 2024

Ecotoxicology

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Effect of different polystyrene nano-plastic concentrations on Chlorella pyrenoidosa

Cited by 19 publications

References 78 publications

Micro- and nanoplastics in freshwater ecosystems—interaction with and impact upon bacterivorous ciliates

Micro- and nanoplastics in freshwater ecosystems—interaction with and impact upon bacterivorous ciliates

Enhancement of carbamazepine removal rate using Tetradesmus obliquus KNUA061 and NaOCl and utilization of the resulting biomass

Distinctive toxic repercussions of polystyrene nano plastic towards aquatic non target species Nitrobacter vulgaris, Scenedesmus sp and Daphnia magna

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