Effects of saponins isolated from Polygonatum sibiricum on H2O2-induced oxidative damage in RIN-m5F cells and its protective effect on pancreas

A series of three-dimensional porous lead dioxide anode materials were prepared by anodizingmethod using oxygen bubbles as templates. The effects of additives sodium acetate, cetyltrimethyl ammonium bromide (CTAB), sodium dodecyl benzene sulfonate(SDBS) and polyethylene glycol (PEG) on three-dimensional porous PbO; anode materials were studied. The morphology and phase composition of the electrode surface were characterized by SEM and XRD. The electrocatalytic activity of the electrode material in Na, 50, solution was determined by anodic polarization curve (LSV), cyclic voltammetry curve (CV) and AC impedance spectrum(EIS). The results show that after the addition of additives, the directional arrangement on the surface of the plating bath can promote the uniform dispersion of Pb, when PbO, is deposited, the surface is coated, the particle aggregation is reduced, and the coating is flatter and denser; at the same time, due to the adsorption of organic additives, the preferred orientation of grains is changed, but the crystal form is not changed, the prepared electrode materials are still p-PbO, with complete morphology and three-dimensional porous structure. With the addition of organic additives, the pore density of the electrode material is increased, the specific surface area of the electrode material is promoted, the charge transfer resistance in the electrocatalysis process is reduced, and the electrocatalytic activity of the electrode material is improved. Among all organic additives, the porous PbO; electrodes added with SDBS has the largest jo (5. 514 x 10 '' A. cm) and the smallest R. (0.3395 cm(2)), showing good electrocatalytic performance. According to the CV data, the q. of the PbO, electrode with SDBS is 0.652 C cm, which is 4 times higher than that of the porous PbO: electrode without additive. The addition of organic additives effectivelyincreases the electrochemically active surface area of the electrode material.