Study On The Chemical Ingredients In Huang Qi Leaves And Cabbage

Engelhardtia roxburghiana is a deciduous tree from Juglandaceae, growing in tropical and subtropical Asia and Central America. Engelhardtia contains6piec-es in China, and they are mainly arbors used as landscape trees. Leaves of E. roxburghiana have been used as a sweet tea to prevent obesity and to treat abd-ominal pain and fever in Guangxi. The known chemical constituents from Engel-hardtia include flavanoids, quinones, steroids and triterpenoids. Previous studies have revealed dihydroflavonol glycosides and flavonolglycosides to be the major and active consistituents of E. roxburghiana. Total flavone of this plant has sign-ificant effects on promoting blood circulation to remove blood stasis, lipid-lower-ing, hypoglycemia and enhanceing organic immunity.In order to develop new medicinal resources, the chemical constituent of the leaves of E. roxburghiana was investigated. After the plant materials were extract-ed and fractionated with solvents, column chromatographies were used to isolate and purified the compounds. The compounds obtained were elucidated on the bas-is of1H-NMR,13C-NMR, and MS and comparison with the data of literatures as following:taxilfolin(1),5,7,4’-trihydroxy flavanone(2), kaempferol(3), dihydrokaem pferol(4), quercetin(5), isoengeletin(6), engeletin(7), astilbin(8), isoastilbin(9), kaemp ferol-3-O-α-L-rhamnoside(10), eucryphin(11),5-hydroxy-3,7,3’,4’-tetramethoxyflavone (12), quercetin-3-α-a-L-rhamnoside(13),2-ethoxy juglon(14), myo-inositol(15),β-sit-osterol(16),β-daucosterol(17), phaeophytin A(18), pentacosane(19), hexacosoic acid ethyl ester(20), nonadecane acid butyl ester(21). Compounds2,4,9,11,12,14, and19-21were identified from the title plant for the first time.Brassica pekinensis, known as Chinese cabbage, is a important vegetable pla-nted in China, from the Cruciferae family. Most plants of Brassica L.can be eaten. Some can produce oil, sugar, or even be a drug. Brassica pekinensis is widely loved by Chinese for its good taste. And it also have physiological activities. Rec ently some studies showed that it may reduce cancer risk.In order to develop new medicinal resources, we have a study on Brassica pekinensis. As a result,5compounds were isolated and identified as:5-hydroxym-ethyl-2-furaldehyde(1), indolyl-3-carbaldehyde(2), sinapinic acid(3),2-hydroxymethy-1-5-hydroxypyridine(4),β-daucosterol(5). Compound1-4were identified from this plant for the first time.