Dual enzyme-like activities of transition metal-doped MnO2 nanocoatings and their dependence on the electronic band structure and ionic dissolution

Manganese dioxide nanosheet-containing reactors as antioxidant support for neuroblastoma cells

“…This latter finding was different from prior reports where the SOD-like activity was suggested to enhance in excess H 2 O 2 . 28 We currently cannot explain the difference in more detail, but it might be dependent on the level of H 2 O 2 excess that is lower here than in the effort by Lui et al…”

“…The SOD-like activity was assessed by monitoring the solution absorbance (l abs = 450 nm) when xanthine was oxidized by xanthine-oxidase, producing O 2 À , which resulted in the formation of a WST-1 (tetrazolium salt) formazan dye due to the reduction of the WST-1 with O 28 We currently cannot explain the difference in more detail, but it might be dependent on the level of H 2 O 2 excess that is lower here than in the effort by Lui et al…”

“…[25][26][27] However, structural defects or doping with other cations (e.g., Na, Co (+II) , Ni (+II) , and Al) can enhance the catalytic activity. 28 Furthermore, manganese oxides feature a large number of polymorphs and different crystalline structures (e.g., a-MnO 2 , d-MnO 2 , and Mn 3 O 4 ), which endow them with a distinct catalytic behavior due to the electron transfer/mobility within their internal (crystalline) structures. [29][30][31] Among the possible options, 2D nanomaterials, and in particular MnO 2 nanosheets, have emerged as the most convenient morphology for catalysis, because of their high specific surface area and usually a larger number of structural defects.…”

“…, Na, Co (+II) , Ni (+II) , and Al) can enhance the catalytic activity. 28 Furthermore, manganese oxides feature a large number of polymorphs and different crystalline structures ( e.g. , α-MnO 2 , δ-MnO 2 , and Mn 3 O 4 ), which endow them with a distinct catalytic behavior due to the electron transfer/mobility within their internal (crystalline) structures.…”

Visible-light-responsive reduced graphene oxide/g-C3N4/TiO2 composite nanocoating for photoelectric stimulation of neuronal and osteoblastic differentiation

“…After 4 h, Micro-BCA Protein Assay Kit (Thermo Fisher Scientific, USA) was used to detect the adsorption amount of fibronectin on the samples, as previously described. 28 Enzyme-linked immunosorbent assay (ELISA) was used to examine the exposed cell recognition site of adsorbed fibronectin for cell-binding, as previously described. 29 …”