Applications and implications of nanoceria reactivity: measurement tools and environmental impact

Ceria Nanoparticles as Enzyme Mimetics

“…Another group [81] also disscussed some physicochemical changes of nanoceria in different environmental conditions. Here we briefly summarize these parameters, which could influence the enzyme mimetic activities of nanoceria.…”

“…[80,81] Nevertheless, nanoceria catalysts are generally considered to be more stable than the nature enzymes. Previous studies demonstrated that nanoceria possessed enzyme-like catalytic activity and were stable over a wide range of pH values and temperatures compared with natural enzyme horseradish peroxidase.…”

“…The temperature of the environment could also affect the stabilities of nanoceria, but most studies up to now focused on the enzyme mimetic behaviors under normal temperature, such as room or physiological ones. [81] Activators and inhibitors have significant effects on the catalytic activity of nanoceria. As mentioned above, CuZn-SOD or some appropriate electron donors can greatly improve the SOD mimetic activity of nanoceria.…”

Nanomaterial-functionalized Cellulose: Design, Characterization and Analytical Applications

“…These NPs have rich surface hydroxyl functionalities when placed in an aqueous environment which allow for facile modification and complex formation. 25,26 CeO2 can serve as a colorimetric agent independently, 70 a mechanism that has been demonstrated for detection of H2O2, phenolic antioxidants and enzyme activity. 27,71 Enzymes such as glucose oxidase and horseradish peroxidase can be utilized in addition to CeO2NPs to impart selectivity and expand the range of analytes that can be detected.…”

“…13b,24 Some oxides such as those based on cerium are redox active at the nanoscale and can function both as oxidation and reduction catalysts. 25 These oxides are present in dual oxidation states (Ce III/IV) and can replace oxidase and peroxidase enzymes in sensing schemes for detection of hydrogen peroxides and oxidase enzyme substrates on filter paper functionalized with these materials through silane bounds. 24b In addition, CeO2 NPs are able to react selectively with catechol-containing molecules 26 which makes them interesting sensing materials for detection of polyphenol antioxidants on paper, in the absence of exogenous materials or soluble redox dyes.…”