title: New dihydrostilbene derivatives from the leaves of Glycyrrhiza glabra and evaluation of their antioxidant activity.
abstract: Five new prenylated dihydrostilbenes, alpha,alpha'-dihydro-3,5,4'-trihydroxy-4,5'-diisopentenylstilbene (1), alpha,alpha'-dihydro-3,5,3',4'-tetrahydroxy-4,5'-diisopentenylstilbene (2), alpha,alpha'-dihydro-3,5,4'-trihydroxy-5'-isopentenylstilbene (3), alpha,alpha'-dihydro-3,5,3'-trihydroxy-4'-methoxy-5'-isopentenylstilbene (4), and alpha,alpha'-dihydro-3,5,3',4'-tetrahydroxy-5'-isopentenyl stilbene (5), along with four known flavonoids, glabranin (6), pinocembrin, (7), licoflavone (8), and wighteone (9), were isolated from a lipid extract of the leaves of Sicilian Glycyrrhiza glabra. The structures of the compounds were elucidated by spectroscopic methods. The antioxidant activities of the crude extracts and the isolated compounds were tested.
authors.affiliation: Istituto del CNR di Chimica Biomolecolare, Sezione di Catania, Via del Santuario 110, I-95028 Valverde CT, Italy.
authors.forename: Daniela M
authors.initials: DM
authors.lastname: Biondi
authors.forename: Concetta
authors.initials: C
authors.lastname: Rocco
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Ruberto
mesh_terms: D000975:Antioxidants / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D005419:Flavonoids / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D006035:Glycyrrhiza / Q000737:chemistry*; D007558:Italy; D019906:Nuclear Magnetic Resonance, Biomolecular; D018515:Plant Leaves / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D013237:Stereoisomerism; D013267:Stilbenes / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology
chemical_list: D000975:Antioxidants; D005419:Flavonoids; D013267:Stilbenes