A novel method for iodate determination using cadmium sulfide quantum dots as fluorescence probes.

We have developed a novel method for the determination of iodate based on the carboxymethyl cellulose-capped CdS quantum dots (QDs). Factors affecting the iodate detection were investigated, and the optimum conditions were determined. Under the optimum conditions, the relative fluorescence intensity of CdS quantum dots was linearly proportional to IO(3)(-) over a concentration range from 1.

Novel looped enzyme-polyamidoamine dendrimer nanohybrids used as biosensor matrix.

We report the synthesis of a novel looped enzyme-polyamidoamine nanocomposite with high enzyme loading density and long-term retention of bioactivity. The horseradish peroxidase (HRP) is first immobilized on fourth-grade (G4) poly(amidoamine) (PAMAM) dendrimer to form relatively a small enzyme-PAMAM composite, which is allowed to grow up into a larger one. The looped horseradish peroxidase-polyamidoamine (HRP-PAMAM) nanohybrid was characterized by TEM.