title: Fructose-amino acid conjugate and other constituents from Cyperus rotundus L.
abstract: Further phytochemical study on the aerial parts of Cyperus rotundus L. led to the isolation of a fructose-amino acid conjugate, N-(1-deoxy-alpha-D-fructos-1-yl)-L-tryptophan (16) and its tautomers, in addition to n-butyl-beta-D-fructopyranoside (1), ethyl-alpha-D-glucopyranoside (2), adenosine (3), (-)-(E)-caffeoylmalic acid (4), vitexin (5), isovitexin (6), orientin (7), epiorientin (8), myricetin 3-O-beta-D-galactopyranoside (9), luteolin 7-O-beta-D-glucuronopyranoside-6''-methyl ester (10), chlorogenic acid (11), luteolin 4'-O-beta-D-glucuronopyranoside (12), luteolin 7-O-beta-D-glucuronopyranoside (13), uridine (14) and ellagic acid (15). Their structures were elucidated on the basis of spectroscopic methods. Additionally, antioxidant and alpha-amylase inhibitory activities of some of the isolated phenolic compounds were carried out.
authors.affiliation: Faculty of Pharmacy, Pharmacognosy Department, Assiut University, Assiut, Egypt.
authors.forename: Hanaa M
authors.initials: HM
authors.lastname: Sayed
authors.forename: Mahmoud H
authors.initials: MH
authors.lastname: Mohamed
authors.forename: Salwa F
authors.initials: SF
authors.lastname: Farag
authors.forename: Gamal A
authors.initials: GA
authors.lastname: Mohamed
authors.forename: Olanrewaju R M
authors.initials: OR
authors.lastname: Omobuwajo
authors.forename: Peter
authors.initials: P
authors.lastname: Proksch
mesh_terms: D000596:Amino Acids / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D000975:Antioxidants / Q000737:chemistry / Q000302:isolation & purification / Q000494:pharmacology; D047310:Apigenin; D029786:Cyperus / Q000737:chemistry*; D005419:Flavonoids; D005632:Fructose / Q000031:analogs & derivatives* / Q000737:chemistry / Q000302:isolation & purification; D005960:Glucosides; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D010946:Plants, Medicinal / Q000737:chemistry*; D013237:Stereoisomerism; D000516:alpha-Amylases / Q000037:antagonists & inhibitors*
chemical_list: D000596:Amino Acids; D000975:Antioxidants; D005419:Flavonoids; D005960:Glucosides; D005632:Fructose; D047310:Apigenin; C032731:vitexin; D000516:alpha-Amylases; C065886:orientin; C049772:isovitexin