Two New Flavones in Citrus reticulata

Abstract

To compare the difference of constituents in the pericarp and in the leaf of Citrus species, polyoxygenated flavones were examined using the leaves of Citrus reticulata Blanco (Rutaceae). Two new flavones, which were not detected in the pericarps of the plant, were isolated, along with other polyoxygenated flavones (1). In this paper the structure elucidation and the syntheses of the flavones are described.Besides eight known polyoxygenated flavones (5-hydroxy-3',4',

Identification of nobiletin metabolites in mouse urine

“…+ at m/z = 481 and 1 H NMR spectrum was compatible with that reported in literature [19]. A solution of 3-benzyloxy-29-hydroxy-39,4,49,59,69-pentamethoxylchalcone (192 mg) in ethanol (10 mL) containing 50 mg of H 3 PO 4 was heated to reflux for 16 h. Upon concentration, the resultant mixture was mixed with water and extracted twice with ethyl acetate (50 mL62).…”

Isolation and Identification of Two New Flavanones and a Chalcone from Citrus kinokuni.

“…The known compounds were fully characterized as scoparone (4), scopoletin (5), nobiletin (6), 8) sinensetin (7), 8) tangeretin (8), 8) 5-hydroxy-6,7,8,4Ј-tetramethoxyflavone (9), 9) 5-hydroxy-6,7,3Ј,4Ј-tetramethoxyflavone (10), 10,11) 5-demethylnobiletin (11), 9,12) 6-demethoxynobiletin (12), 8) 6-demethoxytangeretin (13), 8) 5,6,7,4Ј-tetramethoxyflavone (14), 13,14) 3,5,6,7,3Ј,4Ј-hexamethoxyflavone (15), 15,16) 3Ј-hydroxy-5,6,7,8,4Ј-pentamethoxyflavone (16), 17) 3,5,6,7,8,3Ј,4Ј-heptamethoxyflavone (17), 8) 7-hydroxy-5,6,3Ј,4Ј-tetramethoxyflavone (18), 17) 7-hydroxy-5,6,8,3Ј,4Ј-pentamethoxyflavone (19), 18) 5,7,8,3Ј,4Ј-pentamethoxyflavanone (20), 19) 5-Odemethylcitromitin (21), 20) 3,4,3Ј,4Ј,5Ј,6Ј-hexamethoxy-2Ј-hydroxychalcone (22), 21) 2Ј-hydroxy-4,4Ј,5Ј,6Ј-tetramethoxychalcone (23) 22,23) and b-sitosterol (24) by direct comparison with authentic samples and/or spectral data reported in the literature.…”

Efeito de extratos de albedo de laranja (Citrus sinensis) e dos indutores de resistência ácido salicílico, acilbenzolar-s-metil e Saccharomyces cerevisiae no controle de Phyllosticta citricarpa (Teleomorfo: Guignardia citricarpa).

“…As cromatografias de coluna e de camada delgada são geralmente usados em estudos quantitativos para alguns dos compostos fenólicos em citros (Albach & Redman, 1969;Albach et al, 1981;Mizuno et al, 1987;Tomas et al, 1978).…”