Sandwich magnetically imprinted immunosensor for electrochemiluminescence ultrasensing diethylstilbestrol based on enhanced luminescence of Ru@SiO by CdTe@ZnS quantum dots.

A molecularly imprinted magnetic sensor with electroluminescent tags (MIP-ECL sensor) was developed for ultrasensing diethylstilbestrol (DES). A strategy is exploited to enhance ECL emission of the [Ru(bpy)]-tripropyl amine (TPrA) system by CdTe@ZnS quantum-dots (QDs) through energy transfer. Magnetically molecularly imprinted nanoparticles (MMIPs NPs) based on FeO@SiO carriers are artificial, easily reproducible, and could replace easily inactivated first antibodies for capturing more DES molecules.

Highly sensitive aptasensor based on synergetic catalysis activity of MoS-Au-HE composite using cDNA-Au-GOD for signal amplification.

Single or few-layer nanosheets of MoS (MoS nanosheets) and a composite composed of MoS nanosheets, Au nanoparticles (AuNPs) and hemin (HE) (denoted as MoS-Au-HE) were prepared. The composites possessed high synergetic catalysis activity towards the electroreduction of hydrogen peroxide. Furthermore, glucose oxidase (GOD) and AuNPs were used as marker of the complementary DNA (cDNA) strand of kanamycin aptamer to prepare a conjugate (reffered as cDNA-Au-GOD) that was designed as the signal probe.

[Self-assembled gold nanoparticles modified electrode for electrochemical detection nitrite].

A modified sensor was fabricated by N-[3-(trimethoxysilyl) propyl]-ethylene diamine (TSPED) and colloidal gold particles (AuNPs) on glass carbon electrode (GCE). Atomic force microscopy (AFM) demonstrated that the colloidal gold particles were self-assembled onto the amine groups of the sol-gel. Due to the excellent electrocatalytic activity of gold nanoparticles toward the oxidation of nitrite and the interaction between the protonated TSPED film and the negatively-charged nitrite, the operating potential for nitrite oxidation was shifted about 140 mV to negative side, compared to bare GCE.

Determination of nitrite using sensors based on nickel phthalocyanine polymer modified electrodes.

An amperometric nitrite sensor based on a polymeric nikel tetraaminothphalocyanine (p-NiTAPc) film coated glassy carbon (GC) electrode was developed. The mechanism of catalysis on the surface of the electrode was discussed. The sensor exhibited fast respond towards nitrite with a detection limit of 1x10(-7)M and a linear concentration range of 5x10(-7) to 8x10(-3)M.

[Preparation and characterization of parathion sensor based on molecularly imprinted polymer].

A novel electrochemical sensor for the detection of parathion based on molecularly imprinted polymer of self-assembled o-aminothiophenol onto gold electrode was constructed. The polymerization solution was prepared from a 10 mmol/L parathion, 5 mmol/L tetra-n-butylammonium perchlorate, 30 mmol/L o-aminothiophenol solution of dichloromethane. Electropolymerization was carried out over 30 cycles between -0.