Co-effects of UV/H2O2 and natural organic matter on the surface chemistry of cerium oxide nanoparticles

2018 ◽  
Vol 5 (10) ◽  
pp. 2382-2393 ◽  
Author(s):  
Xuanhao Wu ◽  
Chelsea W. Neil ◽  
Doyoon Kim ◽  
Haesung Jung ◽  
Young-Shin Jun
Keyword(s):  
Organic Matter ◽  
Surface Chemistry ◽  
Cerium Oxide ◽  
Natural Organic Matter ◽  
Colloidal Stability ◽  
Chemical Properties ◽  
Cerium Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Surface Chemical

This study delineates the co-effects of UV/H2O2 and NOM on the colloidal stability and surface chemical properties of CeO2 nanoparticles.

UV-induced toxicity of cerium oxide nanoparticles (CeO2 NPs) and the protective properties of natural organic matter (NOM) from the Rio Negro Amazon River

2018 ◽  
Vol 5 (2) ◽  
pp. 476-486 ◽  
Author(s):  
Yueyang Zhang ◽  
Tamzin A. Blewett ◽  
Adalberto L. Val ◽  
Greg G. Goss
Keyword(s):  
Organic Matter ◽  
Cerium Oxide ◽  
Natural Organic Matter ◽  
Cerium Oxide Nanoparticles ◽  
Amazon River ◽  
Oxide Nanoparticles ◽  
Lethal Effects ◽  
Protective Properties ◽  
Rio Negro

Co-exposure of UV and CeO2 NPs caused sub-lethal effects on cardinal tetras and NOM reduced the phototoxicity of CeO2 NPs.

scholarly journals Influence of surface chemical properties on the toxicity of engineered zinc oxide nanoparticles to embryonic zebrafish

2015 ◽  
Vol 6 ◽  
pp. 1568-1579 ◽  
Author(s):  
Zitao Zhou ◽  
Jino Son ◽  
Bryan Harper ◽  
Zheng Zhou ◽  
Stacey Harper
Keyword(s):  
Zinc Oxide ◽  
Surface Chemistry ◽  
Zinc Oxide Nanoparticles ◽  
Chemical Properties ◽  
Mortality Data ◽  
Oxide Nanoparticles ◽  
Surface Chemical ◽  
Chemical Modifications ◽  
Zno Nps ◽  
Outermost Surface

Zinc oxide nanoparticles (ZnO NPs) are widely used in a variety of products, thus understanding their health and environmental impacts is necessary to appropriately manage their risks. To keep pace with the rapid increase in products utilizing engineered ZnO NPs, rapid in silico toxicity test methods based on knowledge of comprehensive in vivo and in vitro toxic responses are beneficial in determining potential nanoparticle impacts. To achieve or enhance their desired function, chemical modifications are often performed on the NPs surface; however, the roles of these alterations play in determining the toxicity of ZnO NPs are still not well understood. As such, we investigated the toxicity of 17 diverse ZnO NPs varying in both size and surface chemistry to developing zebrafish (exposure concentrations ranging from 0.016 to 250 mg/L). Despite assessing a suite of 19 different developmental, behavioural and morphological endpoints in addition to mortality in this study, mortality was the most common endpoint observed for all of the ZnO NP types tested. ZnO NPs with surface chemical modification, regardless of the type, resulted in mortality at 24 hours post-fertilization (hpf) while uncoated particles did not induce significant mortality until 120 hpf. Using eight intrinsic chemical properties that relate to the outermost surface chemistry of the engineered ZnO nanoparticles, the highly dimensional toxicity data were converted to a 2-dimensional data set through principal component analysis (PCA). Euclidean distance was used to partition different NPs into several groups based on converted data (score) which were directly related to changes in the outermost surface chemistry. Kriging estimations were then used to develop a contour map based on mortality data as a response. This study illustrates how the intrinsic properties of NPs, including surface chemical modifications and capping agents, are useful to separate and identify ZnO NP toxicity to zebrafish (Danio rerio).

scholarly journals Soil organic matter influences cerium translocation and physiological processes in kidney bean plants exposed to cerium oxide nanoparticles

2016 ◽  
Vol 569-570 ◽  
pp. 201-211 ◽  
Author(s):  
Sanghamitra Majumdar ◽  
Jose R. Peralta-Videa ◽  
Jesica Trujillo-Reyes ◽  
Youping Sun ◽  
Ana C. Barrios ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Cerium Oxide ◽  
Kidney Bean ◽  
Cerium Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Physiological Processes ◽  
Bean Plants

Controlling the surface chemistry of cerium oxide nanoparticles for biological applications

2016 ◽  
Vol 4 (19) ◽  
pp. 3195-3202 ◽  
Author(s):  
Ankur Gupta ◽  
Soumen Das ◽  
Craig J. Neal ◽  
Sudipta Seal
Keyword(s):  
Surface Chemistry ◽  
Cerium Oxide ◽  
Room Temperature ◽  
Cerium Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Biological Applications

Room temperature doping of cerium oxide nanoparticles to control the surface chemistry for enhanced biocatalytic activity is proposed.

scholarly journals Colloidal stability and catalytic activity of cerium oxide nanoparticles in cell culture media

RSC Advances ◽  
2020 ◽  
Vol 10 (65) ◽  
pp. 39373-39384 ◽  
Author(s):  
Xiaohui Ju ◽  
Anna Fučíková ◽  
Břetislav Šmíd ◽  
Jaroslava Nováková ◽  
Iva Matolínová ◽  
...  
Keyword(s):  
Cell Culture ◽  
Catalytic Activity ◽  
Acrylic Acid ◽  
Cerium Oxide ◽  
Colloidal Stability ◽  
Culture Media ◽  
Cerium Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Cell Culture Media ◽  
Poly Acrylic Acid

Cerium oxide nanoparticles coated with poly(acrylic acid) exhibited high colloidal stability and preserved catalytic activity in cell culture media.

Nanoparticles of cerium oxide. The application and cerium oxide toxicity assessment

2021 ◽  
pp. 38-43
Author(s):  
Maria N. Kuznetsova ◽  
Vera Yu. Zhilkina
Keyword(s):  
Cerium Oxide ◽  
Modern Science ◽  
Chemical Properties ◽  
Toxicity Assessment ◽  
Cerium Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Oxide Material ◽  
Physical And Chemical Properties ◽  
Physical And Chemical ◽  
And Chemical Properties

Nanotechnology is the most perspective direction in the modern science and technic. The great interest in entire world has been observing to nanoparticles properties and their fields of use investigation. Cerium dioxide is a perspective oxide material which has wide use in different branches of industry due to its unique physical and chemical properties. Burst of interest to cerium oxide nanoparticles development and use in biology and medicine takes has been taking place recently. Scientists in many countries have been carrying out cerium oxide nanoparticles efficiency of use against various diseases.

Polyacrylic Acid Modified Cerium Oxide Nanoparticles: Synthesis and Characterization as a Peroxidase Mimic for Non-Enzymatic H2O2 Sensor

2020 ◽  
Vol 16 (5) ◽  
pp. 816-828
Author(s):  
Gurdeep Rattu ◽  
Nishtha Khansili ◽  
Prayaga M. Krishna
Keyword(s):  
Hydrogen Peroxide ◽  
Cerium Oxide ◽  
Polyacrylic Acid ◽  
Spectroscopic Analysis ◽  
Cerium Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Peroxidase Mimic ◽  
Ft Ir ◽  
H2o2 Sensing ◽  
Fluorescence Spectrometer

Background: Cerium oxide nanoparticles (nanoceria) are efficient free-radical scavengers due to their dual valence state and thus exhibit optical and catalytic properties. Therefore, the main purpose of this work was to understand the peroxidase mimic activity of polymer-stabilized nanoceria for enzyme-less H2O2 sensing by fluorescence spectrometer. Objective: This research revealed the development of fluorescence hydrogen peroxide nanosensor based on the peroxidase-like activity of polyacrylic acid stabilized nanoceria (PAA-CeO2 Nps). Methods: PAA-CeO2 Nps were synthesized by simple cross-linking reaction at a low temperature and characterized by XRD, SEM, Zeta potential, TGA, FT-IR and UV-VIS spectroscopic analysis. H2O2 sensing was performed by a fluorescence spectrometer. Results:: The synthesized polymer nanocomposite was characterized by XRD, SEM, TGA, FT-IR and UV-VIS spectroscopic analysis. The XRD diffraction patterns confirmed the polycrystalline nature and SEM micrograph showed nanoparticles having hexagonal symmetry and crystallite size of 32 nm. The broad peak of Ce–O bond appeared at 508 cm-1. UV-VIS measurements revealed a welldefined absorbance peak around 315 nm and an optical band-gap of 3.17 eV. As synthesized PAACeO2 Nps effectively catalysed the decomposition of hydrogen peroxide (H2O2) into hydroxyl radicals. Then terephthalic acid was oxidized by hydroxyl radical to form a highly fluorescent product. Under optimized conditions, the linear range for determination of hydrogen peroxide was 0.01 - 0.2 mM with a limit of detection (LOD) of 1.2 μM. Conclusion: The proposed method is ideally suited for the sensing of H2O2 at a low cost and this detection system enabled the sensing of analytes (sugars), which can enzymatically generate hydrogen peroxide.

Radiosensitizing Effect of Cerium Oxide Nanoparticles on Human Leukemia Cells

2018 ◽  
Vol 6 (2) ◽  
pp. 111-115 ◽  
Author(s):  
Azadeh Montazeri ◽  
Zohreh Zal ◽  
Arash Ghasemi ◽  
Hooman Yazdannejat ◽  
Hossein Asgarian-Omran ◽  
...  
Keyword(s):  
Cerium Oxide ◽  
Leukemia Cells ◽  
Cerium Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
Human Leukemia ◽  
Radiosensitizing Effect ◽  
Human Leukemia Cells
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