Toxic effect of nano and bulk TiO2 on growth, chlorophyll a content and oxidative stress of marine diatom Chaetoceros muelleri

Abstract

Nanoparticles are widely used in many applications. The recent increase in nanomaterials usage has led to raising concerns about its health risks and environmental impact. In this study, we examined the toxicity effects of nanoparticles TiO 2 and bulk Ti on marine diatom chatetoceros muelleri. We treated microalgae with equal amounts of nano and bulk TiO 2 in different concentrations include 0, 10, 50, 100, 200 and 300 ppm, then was investigated their growth in 96 h. Observations demonstrated growth inhibition in 50 mg/L from first exposure day for nano and bulk TiO 2. Furthermore, the chlorophyll a content strongly decreased in nano and bulk in TiO 2 in different days rather than control, respectively. As well as, results showed that, antioxidant values in nano-treated samples were higher than bulk in comparison control. In addition, we found that nano was more toxic than bulk. We aimed, indicating critical impacts of nTiO 2 on the ecosystem.

Combined analysis of transcriptomics and metabolomics on the cumulative effect of nano-titanium dioxide on mulberry seedlings

“…Nanoparticles (NPs), along with genetic engineering and artificial intelligence, are commonly referred to as the cutting-edge technologies of the 21st century. NPs have the properties of stability, hydrophilicity, photocatalysis, nonirritant, good weatherability and shading in mechanics, heat, magnetism, optics, electricity and chemistry ( Huang et al., 2019 ; Baharlooeian and Badhul, 2020 ). They can be applied in targeted drug delivery, diagnosis, tissue engineering and environmental remediation ( Gandhimathi et al., 2019 ; Bidast et al., 2020 ; Santelli et al., 2020 ; Bajpai et al., 2022 ; Shukla et al., 2022 ).…”

“…However, with the wide application of TiO 2 NPs, their safety profile has attracted greater attention recently. It has been reported that TiO 2 NPs may be more toxic to organisms than TiO 2 coarse particles ( Wei et al., 2018 ; Baharlooeian and Badhul, 2020 ). Its safety has been widely studied in agriculture, medicine, environmental and other fields ( Dreno et al., 2019 ; Fattahi et al., 2021 ; Fiordaliso et al., 2022 ), and is a global current research hotspot ( Wu et al., 2014 ; Shi et al., 2022 ).…”