1.
A laccase based biosensor on AuNPs-MoS2 modified glassy carbon electrode for catechol detection.
Zhang, Y, Li, X, Li, D, Wei, Q
Colloids and surfaces. B, Biointerfaces. 2020;:110683
Abstract
As a kind of two-dimensional layered nanomaterial, MoS2 nanosheets have been widely used in the field of biosensors. In this work, a novel laccase based biosensor for catechol detection was fabricated based on a nanocomposite of MoS2 nanosheets and gold nanoparticles. The experimental results demonstrated that MoS2 had large specific surface area and good biocompatibility, which provided abundant position for enzyme immobilization. Gold nanoparticles enhanced conductivity of MoS2 and improved detection sensitivity. Because of the synergistic effect of MoS2 nanosheets and gold nanoparticles, the laccase based bioelectrode exhibited a linear response to catechol from 2 to 2000 μM with a detection limit of 2 μM (S/N = 3), as well as good selectivity, stability, repeatability, and reproducibility.
2.
Photoelectrochemical immunosensor for N6-methyladenine detection based on Ru@UiO-66, Bi2O3 and Black TiO2.
Wang, Y, Yin, H, Li, X, Waterhouse, GIN, Ai, S
Biosensors & bioelectronics. 2019;:163-170
Abstract
A novel photoelectrochemical (PEC) immunosensor was successfully constructed for N6-methyladenine (m6A) detection based on the photoactive materials of black titanium dioxide (B-TiO2) and bismuth trioxide (Bi2O3) and the signal amplification unit of [Ru(bpy)3]2+-doped metal organic framework (MOF). The Bi2O3/B-TiO2/ITO electrode was first fabricated, then decorated with gold nanoparticles (AuNPs) which provided sites for anchoring m6A antibodies. After the capture of m6A via immunoreaction with the antibody, the Zr-based metal organic framework (UiO-66)-[Ru(bpy)3]2+ compound was further attached specifically to the phosphate group of m6A. With visible light irradiation, a large and stable photocurrent response was produced in the presence of ascorbic acid (AA). Under optimized experimental conditions, the linear range of the PEC biosensor was 0.05-30 nM, with a low detection limit of 0.0167 nM (S/N = 3). This method showed high specificity, selectivity, stabilization and repeatability. Moreover, it was successfully used for the detection of m6A in rice seedling leaves that had been subjected to heavy metal treatment during their development.
3.
Magnetic nanoferromanganese oxides modified biochar derived from pine sawdust for adsorption of tetracycline hydrochloride.
Liang, J, Fang, Y, Luo, Y, Zeng, G, Deng, J, Tan, X, Tang, N, Li, X, He, X, Feng, C, et al
Environmental science and pollution research international. 2019;(6):5892-5903
Abstract
In this study, a new type of composite material, namely modified biochar (MBC), was synthesized by loading the magnetic ferromanganese oxide nanoparticles on pine biochar. BET, SEM, and FTIR were employed to analyze the surface properties and pore structures of MBC. In addition, XRD was adopted to examine the crystal structure of MBC. Characterization results showed that the surface area and porosity of MBC have been greatly improved, and the functional groups have been introduced by ferromanganese oxides. Adsorption experiments of tetracycline hydrochloride (TC) including kinetics, isotherms, thermodynamics as well as the influence of pH, salt ion strength, and the environmental risk of MBC, were evaluated. The results revealed that the experimental data conformed to the pseudo-second-order kinetic model and the Freundlich isotherm model. In the adsorption process, MBC showed excellent adsorption ability (maximum capacity for TC 100.74 mg g-1) to BC (33.76 mg g-1). In isotherm experiments, the maximum adsorption capacity of TC by MBC reached 177.71 mg g-1. Toxicity studies showed that the MBC had no harm to the environment. To conclude, MBC has great potential for applications in removing TC from water.