Flavonoids and fatty acids of Camellia japonica leaves extract

Abstract

Abstract:The ethanol extract from the leaves of Camellia japonica L., Theaceae, showed antiradical potential in the DPPH test using TLC plates (SiO 2 ). Aiming the isolation of active compounds, this extract was partitioned between BuOH:H 2 O (1:1) and the two obtained phases were also evaluated to detection of antiradical activity. The active BuOH phase was fractionated in Sephadex LH-20 and silica (normal or reverse phase) to afford three aglycone flavonoids (quercetin, kaempferol and apigenin), which have been described in the C. japonica at first time, two glycosilated flavonoids (rutin and quercetrin), and a mixture of saturated fatty acids. The structures of isolated compounds were defined by NMR and GC/MS analyses.

Experimental and computational studies of an antiplasmodial derivative of allantoin; antimycobacterial essential oil from Cordia batesii WERNHAM (Boraginaceae)

“…1 ). Their assignments were consistent with structures of: allantoin ( 1 ) [ 32 ], pyrimidine 2,4-(1 H ,3 H )-dione ( 3 ) [ 33 ], cordialin A ( 4 ) and cordialin B ( 5 ) [ 34 ], quercetin ( 6 ) [ 35 ], myricetin ( 7 ) [ 36 ], genistein 4′- O -glucuronide ( 8 ) [ 37 ], methyl palmitate ( 9 ) [ 38 ], palmitic acid ( 10 ) [ 39 ], methyl (9 E ,12 E )-octadeca-9,12-dienoate ( 11 ) [ 40 ], methyl oleate ( 12 ) [ 41 ], methyl tridecanoate ( 13 ) [ 42 ] and ( Z )-octadec-11-enoic acid ( 14 ) [ 43 ].

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1H-Nuclear Magnetic Resonance Analysis of the Triacylglyceride Composition of Cold-Pressed Oil from Camellia japonica

“…As chemical constituents of this natural medicine, several triterpenes, flavonoids and phenolic compounds were reported [ 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 ]. Moreover, when analyzing and studying the therapeutic properties of CJ, modern science has made it possible to specify the potential medical significance of their antimicrobial [ 13 ], antioxidant [ 14 , 15 ], antitumoral [ 16 ], neuronal cell protective [ 17 ], antihistaminic and anti-allergic [ 18 , 19 , 20 ], antiviral [ 21 , 22 ], hypoglycaemic potential [ 23 ], ethanol absorption inhibition [ 24 ] and skin healing properties [ 25 ].…”

COVID-19 Prophylaxis Efforts Based on Natural Antiviral Plant Extracts and Their Compounds

“…Inhibitory effects on key gene and protein synthesis during PEDV replication have been shown as well [ 46 ]. Camellia japonica does not produce purine alkaloids, but it does contain the flavonoids quercetin, kaempferol and apigenin [ 144 , 145 , 146 ]. A screening study of antiviral action of herbal extracts in 1979 found that a triterpenoid saponin from licorice ( Glycyrrhyza glabra) roots, glycyrrhyzic acid, was active against viruses [ 147 ].…”