Determination of Organophosphorus Pesticides Based on BDD Electrode Modified with Au/chitosan Fiber

Abstract

The Au/chitosan fiber was firstly prepared by electrospinning and chemical reduction method and used to modify BDD electrode for the detection of methyl parathion. The results indicated that Au/chitosan fibermodified BDD electrode could improve the electrocatalytic activity, accelerate response, enhance the sensitivity, and reduce the detection limit, as compared with the bare BDD electrode. The repeatability and stability of Au/chitosan fiber-modified BDD electrode was also studied. For the detection of methyl parathion in the apple juice samples, Au/chitosan fiber-modified BDD electrode obtained favorable results and ideal recovery rate. EXPERIMENTAL Chemicals and ApparatusMethyl parathion was obtained from Chengdu Bestreagent Co., Ltd., China. All other chemicals were analytical reagent grade. The supporting electrolyte was phosphate buffer solution (PBS, pH 5.9) prepared with Na 2 HPO 4 and KH 2 PO 4 . Electrochemical measurements were per-

Recent Progress in Natural Biopolymers Conductive Hydrogels for Flexible Wearable Sensors and Energy Devices: Materials, Structures, and Performance

“… , Unlike chitosan, chitin, serving as the ubiquitous structural components in the fungal cell walls, crustacean exoskeletons and cephalopod beaks, is formed mainly by N -acetyl-glucosamine units and it is the second most abundant biopolymers after cellulose. The two materials and their derivatives have wide practical applications in fields of films, gels, , fibers, , paper, and spheres, which are widely utilized in flexible sensors. However, because of the poor swell ability, highly crystalline structure and high hydrophobicity, chitin could only be dissolved in concentrated acids and strong or highly polar solvents while it is insoluble in almost all common water-based solvents, greatly hindering the preparation of chitin hydrogels.…”