An amperometric biosensor for hydrogen peroxide (H 2 O 2 ) was developed via an easy and effective enzyme immobilization method with the "sandwich" configuration: ferrocene-chitosan: HRP: chitosan-glyoxal using a glassy carbon electrode as the basic electrode. In order to prevent the loss of immobilized HRP under optimized conditions, the biosensor surface was cross-linked with glyoxal. Ferrocene was selected and immobilized on the glassy carbon electrode surface as a mediator. The fabrication procedure was systematically optimized to improve the biosensor performance. The biosensor had a fast response of less than 10 s to H 2 O 2 , with a linear range of 3.5×10 -5 to 1.1×10 -3 M, and a detection limit of 8.0×10 -6 M based on S/N = 3.

CQDs were obtained from a POP derived porous carbon via nitric acid oxidation. CQDs/CG composite film with special properties were fabricated and used for ECL detection of DA in human body fluids.

A novel type of sol-gel inorganic-organic hybrid material coated on glassy carbon electrode used for immobilization of double-stranded DNA (dsDNA) and study of dsDNA with redox-active molecules was developed. The hybrid material coating was produced by sol-gel method with nano hydroxyapatite (HAp)-polyvinyl alcohol (PVA). The optimum composition of the hybrid material was first examined, and the morphology of the nano HAp-PVA coatings was investigated with the help of Scanning Electron Microscope (SEM). DsDNA was immobilized in/on the nano HAp-PVA hybrid coatings by adsorption and the characteristics of the dsDNA/HAp-PVA/GCE were studied by cyclic voltammetry (CV) using the probes of Co(phen)

The title molecule, C18H14N2O3, adopts a trans configuration with respect to the C=N double bond. The naphthalene system and the benzene ring make a dihedral angle of 30.3 (3)°. In the crystal structure, intermolecular O—H...O and N—H...O hydrogen bonds result in the formation of two‐dimensional layers parallel to the bc plane.