Biotoxicity of TiO2 Nanoparticles on Raphidocelis subcapitata Microalgae Exemplified by Membrane Deformation

Özkaleli, Merve; Erdem, Ayça

doi:10.3390/ijerph15030416

Cited by 40 publications

(24 citation statements)

References 53 publications

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“…Othman et al [ 53 ] showed an enhanced stability of NPs with higher zeta potential magnitude. Ozkaleli and Erdem [ 26 ] reported a moderate stability of TiO 2 NPs in a very soft synthetic surface water samples with an ionic strength of 0.5 mM. In our results, a moderate stability was also achieved in algae+TiO 2 NP solutions.…”

Section: Resultssupporting

confidence: 76%

“…TiO 2 has an activation wavelength between 376 and 413 nm in the UV range of the electromagnetic spectrum [ 12 , 13 , 14 , 15 ]. Studies have shown the effects of UV radiation [ 16 , 17 , 18 , 19 ], solar simulated light [ 20 , 21 , 22 , 23 , 24 , 25 , 26 ], and natural sunlight [ 27 , 28 ] with TiO 2 NP on aquatic organisms in terms of mortality, reduced growth, and DNA deformation.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Algae Age and Population on the Response to TiO2 Nanoparticles

Metzler

Erdem

Huang

2018

IJERPH

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This work shows the influence of algae age (at the time of the exposure) and the initial algae population on the response of green algae Raphidocelis subcapitata to titanium dioxide nanoparticles (TiO2 NPs). The different algae age was obtained by changes in flow rate of continually stirred tank reactors prior to NP exposure. Increased algae age led to a decreased growth, variations in chlorophyll content, and an increased lipid peroxidation. Increased initial algae population (0.3−4.2 × 106 cells/mL) at a constant NP concentration (100 mg/L) caused a decline in the growth of algae. With increased initial algae population, the lipid peroxidation and chlorophyll both initially decreased and then increased. Lipid peroxidation had 4× the amount of the control at high and low initial population but, at mid-ranged initial population, had approximately half the control value. Chlorophyll a results also showed a similar trend. These results indicate that the physiological state of the algae is important for the toxicological effect of TiO2 NPs. The condition of algae and exposure regime must be considered in detail when assessing the toxicological response of NPs to algae.

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Section: Resultssupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Influence of Algae Age and Population on the Response to TiO2 Nanoparticles

Metzler

Erdem

Huang

2018

IJERPH

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“…Furthermore, NPs can also accumulate in the cell membrane and lead to cell wall depression, which causes changes in cell membrane permeability, until cell apoptosis occurs [20]. Nanoparticles have been found to increase lipid peroxidation in cell membranes, resulting in membrane structure deformation [55]. In the cytotoxicity study of TiO 2 NPs toward Scenedesmus obliquus, plasmolysis and dentate cell membrane were observed.…”

Section: Effect Of Nps On the Cell Membranementioning

confidence: 99%

Effects of Nanoparticles on Algae: Adsorption, Distribution, Ecotoxicity and Fate

et al. 2019

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With the rapid development of nanotechnology and widespread use of nanoproducts, the ecotoxicity of nanoparticles (NPs) and their potential hazards to the environment have aroused great concern. Nanoparticles have increasingly been released into aquatic environments through various means, accumulating in aquatic organisms through food chains and leading to toxic effects on aquatic organisms. Nanoparticles are mainly classified into nano-metal, nano-oxide, carbon nanomaterials and quantum dots according to their components. Different NPs may have different levels of toxicity and effects on various aquatic organisms. In this paper, algae are used as model organisms to review the adsorption and distribution of NPs to algal cells, as well as the ecotoxicity of NPs on algae and fate in a water environment, systematically. Meanwhile, the toxic effects of NPs on algae are discussed with emphasis on three aspect effects on the cell membrane, cell metabolism and the photosynthesis system. Furthermore, suggestions and prospects are provided for future studies in this area.

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“…Diverse photocatalytic nanomaterials such as TiO2, AgNps, ZnO, CuO, CeO have been investigated using different species of algae [31,179,185,186,187,188,189,190].…”

Section: Algaementioning

confidence: 99%

An approach to the photocatalytic mechanism in the TiO2-nanomaterials microorganism interface for the control of infectious processes

Rodríguez-González

Obregón

Patrón-Soberano

et al. 2020

Applied Catalysis B: Environmental

148

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J o u r n a l P r e -p r o o f 2 Graphical Abstract Highlights  Photoactive TiO2 nanomaterials can solve the actual microbial infectious defies  The microbial cell/TiO2 surface approach is key to get the photo-kill mechanism  Microbial preparation requires a reproducible protocol for proper characterization  Advanced surface characterization techniques can unravel the photo-kill mechanism  Generation of ROS, physical injuries and biocidal features confirm the annihilation J o u r n a l P r e -p r o o f Abstract The approach of this timely review considers the current literature that is focused on the interface nanostructure/cell-wall microorganism to understand the annihilation mechanism. Morphological studies use optical and electronic microscopes to determine the physical damage on the cell-wall and the possible cell lysis that confirms the viability and microorganism death. The key parameters of the tailoring the surface of the photoactive nanostructures such as the metal functionalization with bacteriostatic properties, hydrophilicity, textural porosity, morphology and the formation of heterojunction systems, can achieve the effective eradication of the microorganisms under natural conditions, ranging from practical to applications in environment, agriculture, and so on. However, to our knowledge, a comprehensive review of the microorganism/nanomaterial interface approach has rarely been conducted. The final remarks point the ideal photocatalytic way for the effective prevention/eradication of microorganisms, considering the resistance that the microorganism could develop without the appropriate regulatory aspects for human and ecosystem safety. Introduction and background 1. TiO 2 based materials obtained from TiO 2 and its composites J o u r n a l P r e -p r o o f previous studies have demonstrated that photocatalysis can be considered a promising tool in anticancer therapies, since the photocatalyst can kill cancer cells such as HeLa cells, which cause cervical cancer [7]. The energy absorbed by the photocatalyst comprises the range of ultraviolet and/or visible light, even natural sunlight. When the photocatalyst absorbs light, if the energy of the photons is enough to excite the electrons J o u r n a l P r e -p r o o f 6in the valence band (VB), then they migrate to a higher energy level in the conduction band (CB) of the material, as it is illustrated in Fig. 1. This phenomenon generates the charge carriers known as hole-electron pairs. The photogenerated hole can migrate to the surface of the material and react with water molecules or hydroxyl ions to produce hydroxyl radicals, while the photoexcited electron in the conduction band can react with the adsorbed molecular oxygen to produce superoxide ions [8]. Since the report of Fujishima and Honda about the water splitting process using a TiO2 electrode under UV irradiation, numerous studies have exploited the photoactive properties of this material [9,10]. Several reviews have studied the relationship between the electronic properties of TiO2 with...

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Biotoxicity of TiO2 Nanoparticles on Raphidocelis subcapitata Microalgae Exemplified by Membrane Deformation

Cited by 40 publications

References 53 publications

Influence of Algae Age and Population on the Response to TiO2 Nanoparticles

Influence of Algae Age and Population on the Response to TiO2 Nanoparticles

Effects of Nanoparticles on Algae: Adsorption, Distribution, Ecotoxicity and Fate

An approach to the photocatalytic mechanism in the TiO2-nanomaterials microorganism interface for the control of infectious processes

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