Host-guest complexes of carotenoids with beta-glycyrrhizic acid

Article Abstract:

The structure, stability and reactivity of the host-guest complexes between a set of carotenoids and the triterpene glycoside, beta-glycyrrhizic acid (GA) were investigated by different physicochemical techniques. It was found that carotenoids form 1:2 complexes with GA in aqueous solutions as well as in polar organic solvents and the complexation has a noticeable effect on the reactivity of carotenoids, such as a decrease in the electron-transfer rates, an increase in the lifetime of radical cations in complexes, and a change in the ratio of reaction products.

Electric properties, Carotenoids, Structure, Aqueous solution reactions

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Complexation of lappaconitine with glycyrrhizic acid: Stability and reactivity studies

Article Abstract:

A two-pronged approach is used to elucidate the stoichimetry and stability of lappoconitine complexes with glycyrrhizic by means of UV and NMR spectroscopy using methods successfully employed to study similar complexes of cyclodextrins. A notable decrease in the rate of the photoinduced electron-transfer reaction between lappaconitine in a complex with glycyrrhizic acid and tyrosine allows the suggestion of an explicit interrelation between the suppressed reactivity of the bound alkaloid and the changes of its theraputic efficiency.

Pharmaceutical Preparation Manufacturing, Pharmaceutical preparations, Anti-Arrhythmics, Usage, Nuclear magnetic resonance spectroscopy, Cyclodextrins, Anti-arrhythmia drugs, Antiarrhythmia agents

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Elementary steps of enzymatic oxidation of nifedipine catalyzed by horseradish peroxidase

Article Abstract:

The elementary steps of the enzymatic oxidation of nifedipine (NF) catalyzed by horseradish peroxidase (HRP) are described based on analysis of kinetic magnetic field effects (MFEs). Results reveal that the first step of the catalytic cycle is single electron transfer resulting in formation of NF. radical cation and ferroperoxidase ([Per.sup.2}).

Oxidation-reduction reaction, Oxidation-reduction reactions, Electron transport, Magnetic properties, Nifedipine

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