We synthesized dextran-based macromolecular probes carrying multiple molecules of horseradish peroxidase (HRP) as a signal-trigger enzyme and of biotin as an assembly mediator without losing the enzymatic activity. Multiple attachments of HRP and biotin to the dextran backbone were readily accomplished after the formation of aldehyde groups into the dextran macromolecule by periodate oxidation....

An amperometric horseradish peroxidase (HRP) biosensor based on multilayer films containing carbon nanotubes (CNTs) and HRP was developed. With the pH regulation of the dispersion solution of CNTs, the sensitivity of the HRP multilayer film biosensor is tunable by the control of the dissociation of CNTs. The successful formation of multilayers was confirmed by UV-visible spectroscopy. The featu...

Ascending projections to the thalamus from a midbrain somatosensory area were investigated in a reptile, Caiman crocodilus. Connections were determined utilizing horseradish peroxidase (HRP) neurohistochemistry in which tetramethylbenzidine was the chromogen. Anterograde experiments, in which HRP injections were placed into the midbrain, revealed bilateral projections to the medialis complex of...

The effect of xanthene dyes on the chemiluminescence from the aerobic indole-3-acetic acid (IAA) oxidation, catalyzed by horseradish peroxidase (HRP), was studied. The rate of IAA oxidation and dye destruction were controlled. It was found that the addition of dyes to the IAA/HRP/O2 system resulted in: (i) the appearance of emission in the region of dye fluorescence, (ii) an increase of the tot...

The present research discusses the structure stabilizing and protecting effects of Ni 2+ against suicide-peroxide inactivation of horseradish peroxidase (HRP). Suicide inactivation of HRP by hydrogen peroxide (3 mM) was monitored by measuring change in the absorbance of the colored product (tetraguaiacol) of the catalytic reaction cycle at 470 nm. Progress curves of the catalytic reaction cycle...

Novel DNA-sensor with enzymatic amplification of the signal has been developed on the base of glassy carbon electrode modified with ds-DNA and horseradish peroxidase (HRP). Phenothiazine dyes Methylene Blue and Methylene Green were used as electrochemical markers for the detection of sulfonamide and anthracycline preparations able to interact with DNA. The biosensor signal related to HRP oxidat...

3D hierarchical layer double hydroxides (LDHs) have attracted extensive interest due to their unique electronic and catalytic properties. Unfortunately, the existing preparation methods require high temperature or toxic organic compounds, which limits the applications of the 3D hierarchical LDHs in biocatalysis and biomedicine. Herein, we present a green strategy to synthesize "Desert Rose Ston...

Following the application either of cobaltic-lysine complex or a 30% solution of horseradish peroxidase (HRP) in a sealed tube to the cut end of the optic nerve of young adult Xenopus frogs, the dendritic morphology of large ganglion cells was studied in retinal wholemount preparations, and compared with that in animals of the same size as revealed by the short time administration of HRP crysta...

Cells in the pretectal nucleus of the optic tract (NOT) of rats, cats and monkeys were retrogradely labeled with horseradish peroxidase (HRP) stereotaxically injected into the inferior olive (IO). A procedure for stabilizing the tetramethylbenzidine (TMB)-HRP reaction product was used to visualize combined TMB-HRP and immunohistochemically localized gamma-aminobutyric acid (GABA) in the same se...