Journal
ANALYTICA CHIMICA ACTA
Volume 1145, Issue -, Pages 79-86Publisher
ELSEVIER
DOI: 10.1016/j.aca.2020.10.063
Keywords
nTiO(2); Solid-phase microextraction; In vivo tracing; Endogenous salicylic acids; Biomarker
Categories
Funding
- NNSFC [21806188, 21527813, 21677182, 21737006]
- NSF of Guangdong Province [2018A030313324]
- Fundamental Research Funds for the Central Universities [19lgpy141]
- Guangdong Province Model Base for Joint Training of Graduates StudentsGuangdong Institute for Analysis [3100018842212]
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This study evaluated the effects of nTiO(2) on plants by in vivo tracing of endogenous salicylic acids using SPME technique. The results showed that exposure to nTiO(2) influenced plant growth indicators, up-regulated salicylic acid and acetylsalicylic acid levels, which were positively correlated with titanium concentrations.
Currently, nano-titanium dioxide (nTiO(2)) is considered an emerging environmental contaminant. Bottle-necked by the traditional destructive and lethal sampling methods, nTiO(2)'s effect in living plants is poorly investigated. Here, in vivo tracing of endogenous salicylic acids at regular intervals was performed by using solid phase microextraction (SPME) technique for evaluating the effects of nTiO(2) on plants. By planting aloe in soil containing varying amounts of nTiO(2), the titanium (Ti) element accumulated in the leaves to concentrations and then reached the maximum of 1.1 +/- 0.4 mg/g after nTiO(2) exceeding 0.1 g/kg. The levels of salicylic acid (SA) and acetylsalicylic acid (ASA) were up-regulated upon the exposure to nTiO(2), while were positively correlated to the contents of Ti. Moreover, the increased malondialdehyde, decreased total superoxide dismutase and fluctuated glutathione along with the addition of nTiO(2) demonstrated the oxidative stress caused by nTiO(2). Meanwhile, apparent growth indicators including leaf elongation, plant fresh weight and root development were influenced, which further confirmed the toxicity of nTiO(2) imparted on aloe. This study presents the possibility of using salicylic acids as biomarkers for revealing the toxicity of nTiO(2) on plants in addition to the other biomarkers and biomass data, and the in vivo SPME technique is powerful for their monitoring. (c) 2020 Elsevier B.V. All rights reserved.
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