Anti-oxidant constituents of the roots and stolons of licorice (Glycyrrhiza glabra) |
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Authors: | Chin Young-Won Jung Hyun-Ah Liu Yue Su Bao-Ning Castoro John A Keller William J Pereira Michael A Kinghorn A Douglas |
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Institution: | Division of Medicinal Chemistry and Pharmacognosy, College of Pharmacy, The Ohio State University, Columbus, Ohio 43210, USA. |
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Abstract: | As part of a search for new cancer chemopreventive agents, a new chalcone derivative (1), a novel group of neolignan lipid esters (2), and seven known phenolic compounds (formononetin, glabridin, hemileiocarpin, hispaglabridin B, isoliquiritigenin, 4'-O-methylglabridin, and paratocarpin B) (3-9) were isolated from the roots and stolons of licorice (Glycyrrhiza glabra). The structures of compound 1 and the individual components of isolate 2 were elucidated using various spectroscopic and chemical methods. All isolates were tested in an authentic peroxynitrite anti-oxidant assay. Of these compounds, hispaglabridin B (6), isoliquiritigenin (7), and paratocarpin B (9) were found to be the most potent anti-oxidant agents. Furthermore, isoliquiritigenin (7) was demonstrated to prevent the incidence of 1,2-dimethylhydrazine-induced colon and lung tumors in mice when administered at a dose of 300 mg/kg. |
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