On the role of methylene blue in the oscillating peroxidase–oxidase reaction

Literature Information

Publication Date 2000-01-05
DOI 10.1039/A910319H
Impact Factor 3.676
Authors

Anita Lunding, Lars Folke Olsen


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Abstract

The role of methylene blue (MB) and its interaction with various enzymic and nonenzymic intermediates in the oscillating peroxidase–oxidase reaction were investigated. Time dependent spectral changes were deconvoluted into time series of the different intermediates. Ferric peroxidase, ferrous peroxidase, and peroxidase compound III account for most of the spectral changes, while the two remaining oxidation states of the enzyme (compound I and II) are only present in very low amounts during any phase of the oscillations. The presence of MB is required for the generation of sustained oscillations and complex dynamics. The amount of ferrous peroxidase formed during an oscillatory cycle decreases with increasing concentrations of MB. At ‘‘high ’’ concentrations of MB only damped oscillations are observed. These findings are interpreted in terms of either a competition between MB and other reactants for NAD• radicals, or of a reaction between MB and ferrous peroxidase. In the absence of MB only damped oscillations can be observed due to slow and irreversible degradation of the enzyme. This suggests that MB also protects the enzyme against degradation.

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Source Journal

Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
CiteScore: 5.5
Self-citation Rate: 10.3%
Articles per Year: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

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