Shanshan Huang,Xujuan Lv,Yuwei Zhang,Juan Wang,Xueji Zhang,Daoqing Fan
The level alterations of antioxidants are highly associated with various oxidative stress-related diseases, food quality and drug safety problems, which enables the reliable and accurate determination of total antioxidant capacity (TAC) become progressively significant. Herein, for the first time, we explored the catalytic effect of MnSiO 3 nanozyme with oxidase-like activity towards different fluorescent substrates, and introduced ratiometric fluorescence to MnSiO 3 -based biosensing. By harnessing MnSiO 3 -propelled catalytic oxidation of two fluorescent substrates with contrary responses (Scopoletin, SC and o-phenylenediamine, OPD), we constructed a facile, cost-effective ratiometric fluorescent (RF) platform for TAC measurement. In the absence of antioxidants, SC and OPD can be oxidized, and the synergistic effect of fluorescence resonance energy transfer (FRET) and inner-filter-effect (IFE) between SC and oxidized OPD (Ox-OPD) will result in the weak fluorescence of Ox-SC at 465 nm and the strong one of Ox-OPD at 562 nm, respectively. However, the addition of antioxidants will dissociate MnSiO 3 , generating the recovered high/low fluorescence values of both substrates. Through monitoring the FI 465 /FI 562 changes, the RF analysis of different antioxidants (Cys, AA, GSH) with satisfactory sensitivity is performed and the TAC measurements in diverse real samples (human serums, beverages, and drugs) are successfully accomplished. Moreover, the system demonstrates high selectivity and could compete with the commercial TAC test kits.
Pengliang Gu,Shiyue Zhang,Wenkai Wang,Qing Hu,Xinyi Fu,Hao Li,Zhan Shi,Hongbin Du
As promising high-energy density anodes for lithium-ion batteries, the Si electrodes face critical challenges from severe volume expansion and poor electrical conductivity. Herein, we report a dual-layer protective structure (Si@MnSiO 3 @C) constructed through an in-situ conversion reaction followed by chemical vapor deposition carbon coating. The inner MnSiO 3 layer is derived from the native SiO 2 layer on Si, forming robust Si─O─Mn covalent bonds that ensure strong interfacial adhesion. The outer carbon layer provides a conductive network and additional structural confinement. This architecture effectively buffers volume expansion, enhances electron transport, and facilitates Li + diffusion kinetics. As a result, the Si@MnSiO 3 @C composite delivers a high initial Coulombic efficiency of 80.1%, retains 86.1% of its capacity after 100 cycles at 0.5 A g −1 , and maintains a specific capacity of 1334 mA h g −1 after 600 cycles at 1 A g −1 , demonstrating excellent cycling stability and rate performance. This work presents a promising strategy for designing high-performance Si-based anodes through interfacial engineering. Graphical We report a dual-layer protective structure (Si@MnSiO 3 @C) constructed through an in-situ conversion reaction followed by chemical vapor deposition carbon coating. The composite delivers a high initial Coulombic efficiency of 80.1%, retains 86.1% of its capacity after 100 cycles at 0.5 A g −1 , and maintains a specific capacity of 1334 mA h g −1 after 600 cycles at 1 A g −1 , demonstrating excellent cycling stability and rate performance.
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