DART (Direct Analysis in Real Time)-MS is a novel mass spectrometric ion source, and allows the analysis of most compounds at ambient pressure and ground potential by producing [M+H] + molecular ion species. Using this method, we examined the compounds characteristic of several kinds of licorices. For the analysis of Glycyrrhiza inflata Batalin, the peak at m/z 339 originates mainly from [M+H] + of licochalcone A (LA), a species-specific compound. This peak was hardly detected in G. glabra Linné and G. uralensis Fischer. These results indicate that G. inflata can be differentiated from the other two species by detection of LA peaks using DART-MS analysis.
Urtica cannabina L. (Urticaceae) is a perennial herb that grows in Xinjiang Uighur Autonomous Region (northwest China). Two megastigmanes (1, 2) and five flavonoid glycosides (3-7) were isolated from its fruit. Compound 1 was determined by spectroscopic analysis to be (+)-blumenol A, and its absolute stereochemistry was determined in detail using chemical conversion and a modification of Mosher's method. Other compounds were identified as (+)-dehydrovomifoliol (2), isovitexin (3), isoquercitrin (4), astragalin (5), afzelin (6), and quercitrin (7) using spectroscopic (NMR, HMBC, MS) and physical methods (melting point and optical rotation). Compounds 1-7 were isolated from this plant for the first time, while this is the first report of megastigmanes in the Urticaceae family. The chemotaxonomic significance of the isolation of these megastigmanes and flavonoid glycosides from Urtica species is discussed.
Other natural products U 0800 Studies of the Egyptian Traditional Folk Medicines. Part 4. New Isoflavonoid Isolated from Egyptian Licorice -[isolation and structure determination of isoglabrone (I)]. -(BABA*, M.; SUMI, S.; IWASAKI, N.; KAI, H.; SAKANO, M.; OKADA, Y.; OKUYAMA, T.; Heterocycles 75 (2008) 12, 3085-3089; Dep. Nat. Med. Phytochem., Meiji Pharm. Univ., Kiyose, Tokyo 204, Japan; Eng.) -H. Toeppel
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.