Affiliation:
1. State University of Novi Pazar, Department of Chemical-Technological Sciences, Novi Pazar
2. Faculty of Medicinal Sciences, Department of Pharmacy, Kragujevac
3. Faculty of Biology, Belgrade
Abstract
Purpurin (1,2,4-trihidroxyanthraquinone), a naurally occuring anthraquinone
pigment present in the root of Rubia tinctorum (Mull. Arg.) Zahlbr. was
isolated from the plant, purified and characterized by HPLC chromatography,
UV-Vis and NMR spectroscopy. The geometries of the purpurin conformers were
optimized using the B3LYP/6-311+G(d,p) level of theory. It was found that
all conformations have similar energies and that the corresponding purpurin
radicals are planar. In spite of their planarity, there is no significant
electron delocalization over the A and C rings. The antioxidant properties
of purpurin were investigated using the colorimetric assay as
Trolox-equivalent antioxidant capacity, and theoretical BDE (Bond
Dissociation Enthalpy). Both methods revealed that purpurin has strong
antioxidant capacity.
Publisher
National Library of Serbia
Subject
General Chemical Engineering,General Chemistry
Cited by
13 articles.
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