Anna Rittmannsberger

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A reliable and simple differential pulse polarographic method is described for the determination of thymoquinone in black seed oil. The polarographic behaviour of thymoquinone was examined in various buffer systems over the pH range 5.0-10.0. Thymoquinone is reduced in a single, reversible peak at the dropping mercury electrode. The differential pulse(More)
A differential pulse voltammetric method is presented for the determination of isopropylmethylphenols (carvacrol and/or thymol) in phytotherapeutic black seed oils. The voltammetric behaviours of these phenols were examined in various buffer systems over the pH range 3.5-10.0. In Sörensen buffered methanol solution (3:7; v:v; pH 8.5), the differential pulse(More)
In this study, a 15-lipoxygenase-modified carbon paste electrode (15-LOX-MCPE) was developed in connection with the help of voltammetry, which can be used as an assay system for screening drugs with inhibiting lipoxygenase (LOX) activity. The influence of different experimental conditions (LOX loading of carbon paste, pH, type of buffer system etc.) was(More)
A differential pulse polarographic method is presented for the determination of atovaquone in its pharmaceutical formulations. The polarographic behaviour of atovaquone was examined in various buffer systems over the pH range 3.0-10.0. In Britton Robinson buffer/methanol solution (1:1; v/v; pH 8.5) the differential pulse polarograms exhibited reproducible(More)
A simple and accurate differential pulse polarographic method has been developed for the determination of oosporein in the culture broth of the fungus Beauveria brongniartii. This hydroxybenzoquinone derivative is the only major secondary metabolite secreted by this entomopathogenic fungus, which is used as biological pest control agent (BCA) against(More)
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