title: Yucca schidigera bark: phenolic constituents and antioxidant activity.
abstract: Two new phenolic constituents with unusual spirostructures, named yuccaols D (1) and E (2), were isolated from the MeOH extract of Yucca schidigera bark. Their structures were established by spectroscopic (ESIMS and NMR) analysis. The new yuccaols D and E, along with resveratrol (3), trans-3,3',5,5'-tetrahydroxy-4'-methoxystilbene (4), yuccaols A-C (5-7), yuccaone A (8), larixinol (9), the MeOH extract of Yucca schidigera bark, and the phenolic portion of this extract, were assayed for antioxidant activity by measuring the free radical scavenging effects using two different assays, namely, the Trolox Equivalent Antioxidant Capacity (TEAC) assay and the coupled oxidation of beta-carotene and linoleic acid (autoxidation assay). The significant activities exhibited by the phenolic fraction and its constituents in both tests show the potential use of Y. schidigera as a source of antioxidant principles.
authors.affiliation: Dipartimento di Scienze Farmaceutiche, Università degli Studi di Salerno, Via Ponte Don Melillo, 84084 Fisciano, Salerno, Italy.
authors.forename: Sonia
authors.initials: S
authors.lastname: Piacente
authors.forename: Paola
authors.initials: P
authors.lastname: Montoro
authors.forename: Wieslaw
authors.initials: W
authors.lastname: Oleszek
authors.forename: Cosimo
authors.initials: C
authors.lastname: Pizza
mesh_terms: D000975:Antioxidants / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D002140:California; D019787:Linoleic Acid / Q000378:metabolism; D015394:Molecular Structure; D010084:Oxidation-Reduction; D010636:Phenols / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D024301:Plant Bark / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D027623:Yucca / Q000737:chemistry*; D019207:beta Carotene / Q000378:metabolism
chemical_list: D000975:Antioxidants; D010636:Phenols; C487250:yuccaol D; C487251:yuccaol E; D019207:beta Carotene; D019787:Linoleic Acid