title: New polyphenol derivative in Ipomoea batatas tubers and its antioxidant activity.
abstract: Four different polyphenolic compounds were isolated by chromatographic methods from methanolic and hydromethanolic extracts of Ipomoea batatas tuber flour. On the basis of UV, mass, and NMR analysis procedures, the structure of the isolated compounds were determined as 4,5-di-O-caffeoyldaucic acid (1), 4-O-caffeoylquinic acid (2), 3,5-di-O-caffeoylquinic acid (3), and 1,3-di-O-caffeoylquinic acid (4). To the best of our knowledge, this is the first report of isolation and characterization of compound 1. Then, we evaluated the antioxidant activity of daucic acid derivative by using DPPH and FRAP methods together with authentic antioxidant standards, l-ascorbic acid, tert-butyl-4-hydroxy toluene (BHT), and gallic acid. The activity of compound 1 in both methods was higher than that of all standards used at the same molar concentration.
authors.affiliation: Dipartimento di Chimica delle Sostanze Naturali, Università di Napoli Federico II, via D. Montesano 49, 80131 Naples, Italy.
authors.forename: Irene
authors.initials: I
authors.lastname: Dini
authors.forename: Gian Carlo
authors.initials: GC
authors.lastname: Tenore
authors.forename: Antonio
authors.initials: A
authors.lastname: Dini
mesh_terms: D000975:Antioxidants / Q000302:isolation & purification* / Q000494:pharmacology; D005419:Flavonoids / Q000302:isolation & purification* / Q000494:pharmacology; D027723:Ipomoea batatas / Q000737:chemistry*; D015394:Molecular Structure; D010636:Phenols / Q000302:isolation & purification* / Q000494:pharmacology; D035281:Plant Tubers / Q000737:chemistry; D059808:Polyphenols; D011801:Quinic Acid / Q000031:analogs & derivatives* / Q000302:isolation & purification / Q000494:pharmacology; D013400:Sugar Acids / Q000302:isolation & purification* / Q000494:pharmacology
chemical_list: D000975:Antioxidants; D005419:Flavonoids; D010636:Phenols; D059808:Polyphenols; D013400:Sugar Acids; D011801:Quinic Acid